# How to convert kw into kva?

# What is the formula to convert kW or kVA into AC amperes?

Some confusion here KW and KVA are units of power. The ampere is a unit of current. If you divide power by the voltage involved, you can determine the current involved, in amps. Power (watts) = volts x amps A volt-amp is a watt. (A volt times an amp is a watt.) .
I=(KVA*1000)/(1.732*V) (Th…ree Phase).
AMP=KW/1000*V*PF -------------------------------------------------------------------------------------------------------------- KW or KVA can be converted to one another but you cannot convert them to amps. You can compute amps by using this formula, KW = I x V x 1.732 x P.F/1000 (Three phase) KVA = I x V x 1.732/1000 (Three phase) ( Full Answer )

# What is difference between kw and kva?

kW is the unit of real power & kVA is the unit of Apparent power. Apparent Power= real power + reactive power Besides this,the ratings which we write on a motor or generator is KVA & not KW. B'coz there are two types of losses in a motor or generator- core losses & ohmic losses. Core loss dep…ends upon the voltage applied & ohmic losses depend upon the current flowing & none of these losses depend upon the power factor i.e. Cos@. As we know that KW power = V * I *Cos@. But as the losses are independent of the power factor hence we need to calculate only KVA = V*I. Comment Apparent power is the vector sum of real power and reactive power, not the sum. KVA is the unit of apparent power and KW is unit of active power. KW is kilowatts, and KVA is kilovoltamps. KW is the apparent power that a normal power meter would measure, while KVA is simply the maximum of the instantaneous product of volts and amps divided by 1000. The difference between these two terms is due to phase angle, which is due to the reactance of the load to an AC power source. KW (kilowatts) is apparant power, while KVA (kilovoltamps) is true power. They are different when the phase angle between voltage and current is not zero, i.e. when the load is reactive, such as in a motor. The ratio of KW over KVA is Power Factor, and is the cosine of the phase angle between voltage and current. It is zero at a phase angle of 90 degree, which occurs for purely (ideal) inductive or capacitive loads with no resistance in the source or conductors, and it is one for purely resistive loads. ( Full Answer )

# Difference between kva and kw?

kw means total usefull power if the power factor is unity Alternative Answer The symbol 'kW' ( not 'kw') represents 'kilowatt', and the symbol 'kV . A' ( not 'kva') stands for 'kilovolt ampere'. In a.c., the product of supply voltage and load current is called 'apparent power', and is expres…sed in volt amperes. To determine 'true power', expressed in watts, you must multiply apparent power by the power factor of the load. apparent power = voltage x current true power = voltage x current x power factor Power factor is the cosine of the angle by which the load current leads or lags the supply voltage. ( Full Answer )

# How do you convert kw to kva?

kVA = kW divided by (power factor). The power factor is the cosine of the angle between voltage and current.

# Convert 20 kva to kw?

Your question cannot be answered, unless the power factor of the load is specified. Since true power (measured in watts ) is the product of apparent power (measured in volt amperes ) and the power factor of the load. So, given your figure of an apparent power of 20 kV . A ( not 'kv…a'*), the corresponding value of true power could (theoretically!) range from .
20 kW at a power factor of 1.0, to .
0 kW at a power factor of 0. (*The correct symbol for kilovolt ampere is 'kV . A', not 'kva', and the correct symbol for kilowatt is 'kW', not 'kw'.) ( Full Answer )

# How many KW in a KVA?

In case of unity Power factor .
One Watt is = 1 Volt - Amp (from the formula P = I x E), .
One kilo Watt is a kilo Volt Amp. .
1 kW = 1 kVA For PF = 0.8, 1 kVA = 0.8 kW

# What is the difference between KW and KVA?

KW is kilowatts, and KVA is kilovoltamps. KW is the apparent power that a normal power meter would measure, while KVA is simply the maximum of the instantaneous product of volts and amps divided by 1000. The difference between these two terms is due to phase angle, which is due to the reactance of t…he load to an AC power source. kVA is apparant power, while KW (kilowatts) is true power. They are different when the phase angle between voltage and current is not zero, i.e. when the load is reactive, such as in a motor. The ratio of KW over KVA is Power Factor, and is the cosine of the phase angle between voltage and current. It is zero at a phase angle of 90 degree, which occurs for purely (ideal) inductive or capacitive loads with no resistance in the source or conductors, and it is one for purely resistive loads. Not asked, but answered for completeness: Also a component is KVAR, or kilovoltamps-reactive, which is a measure of reactive power. There is also reactive power factor, KVAR over KVA, which is the sine of the phase angle, but this is not commonly used. It is one for purely inductive or capacitive loads with no resistance in the source of conductors, and it is zero for purely resistive loads. ( Full Answer )

# Why transformer rating in KVA instead of KW?

There are 2 losses in transformer. One is copper loss which depends on current and the other is iron loss which depends on voltage. These two factors are not affected by the power factor. This is why transformers are rated in KVA and not KW. Single phase KVA = Amps x Volts/1000. Single phase KW = Am…ps x Volts x pf/1000. 3 phase KVA = Amps x Volts x 1.73/1000. 3 phase KW = Amps x Volts x 1.73 x pf/1000. ( Full Answer )

# What is the relation between KVA and KW?

When calculating kW, power factor is brought into the equation Formula for single phase kVA = I x E/1000, 3 phase kVA = I x E x 1.73/1000 Formula for single phase KW = I x E x pf/1000, 3 phase kW = I x E x 1.73 x pf/1000 Alternative Answer When an AC current flows through a purely res…istive circuits, its temperature increases above the ambient temperature, and energy is lost to the surroundings through heat transfer. This energy transfer is irreversible. The rate at which this energy loss is taking place is called the true power of the circuit, and is expressed in watts (symbol: W ). When an AC current flows through a purely reactive (i.e. inductive or capacitive) circuit, during the first quarter-cycle, energy is stored in the magnetic or electric field, and returned to the circuit during the next quarter cycle. So, although energy transfer is taking place, there is no net loss of energy. The rate at which this energy transfer is taking place is called the reactive power of the circuit, and is expressed in reactive volt amperes (symbol: var ). However, most practical circuits are inductive-reactive circuits. So, when AC current flows through an inductive-reactive circuit, some energy is permanently lost while some energy is transferred from and back to the circuit. In other words, most circuits exhibit a combination of true power and reactive power. The vector sum of true power and reactive power is called apparent power , and is expressed in volt amperes (symbol: V . A ). To summarise: (Apparent Power) 2 = (True Power) 2 + (Reactive Power) 2 From the above equation, in a purely resistive circuit, the apparent power will be equal to the true power. For resistive-reactive circuits, the apparent power will always be larger than the true power. Read more: http://wiki.answers.com/Q/What_is_KW_and_KVA#ixzz1c8EUULFz . ( Full Answer )

# Why alternators are measured in Kva but not in KW?

Depending upon the connected load ( R, RL, RC or RLC) with a transformer, the power goes ou from a transformer may be of two types:.
1. Active Power; measured in kW.
2. Reactive Power; measured in kVAR.
If the rating will be in kW, then kVAR rating would not be accounted but if the rating is in k…VA then it is possible for us to calculate the total active and reactive current as well as the powers, at a particular system voltage! ( Full Answer )

# How do you calculate amp with kw and kva?

I (current in Amps) = E (volts) / R (resistance in ohms) ... W (Watts) = I x E ... The k simply means 1000

# How do you convert kW-h to kW?

A kilowatt (kW) is the unit used to measure the rate of energy consumption of an electrical appliance or some other kind of electrical equipment. It is equal to 1000 watts. A kilowatt-hour (kW . h) is a unit of energy consumed and is equal to 1000 watts used for one hour. It is also equal to 2 kil…owatts used for half and hour, 10 kilowatts used for 1/10 of an hour, etc. ( Full Answer )

# What is KW and KVA?

"kW" (kilowatt) is a measure of rate of actual energy flow. "kVA" is AC voltage multiplied by current. Purely reactive loads (inductors and capacitors) do not dissipate power (energy) so there is no "kW" value. On the other hand, they do conduct current and a "kva" value can be worked out. For a …purely resistive load (like a bar heater, electric stove or incandescent light) "kW" and "kVA" will be the same value. For inductive loads like electric motors, the "kVA" value will be higher than the "kW" value. Alternative Answer When an AC current flows through a purely resistive circuits, its temperature increases above the ambient temperature, and energy is lost to the surroundings through heat transfer. This energy transfer is irreversible. The rate at which this energy loss is taking place is called the true power of the circuit, and is expressed in watts (symbol: W ). When an AC current flows through a purely reactive (i.e. inductive or capacitive) circuit, during the first quarter-cycle, energy is stored in the magnetic or electric field, and returned to the circuit during the next quarter cycle. So, although energy transfer is taking place, there is no net loss of energy. The rate at which this energy transfer is taking place is called the reactive power of the circuit, and is expressed in reactive volt amperes (symbol: var ). However, most practical circuits are inductive-reactive circuits. So, when AC current flows through an inductive-reactive circuit, some energy is permanently lost while some energy is transferred from and back to the circuit. In other words, most circuits exhibit a combination of true power and reactive power. The vector sum of true power and reactive power is called apparent power , and is expressed in volt amperes (symbol: V . A ). To summarise: (Apparent Power) 2 = (True Power) 2 + (Reactive Power) 2 From the above equation, in a purely resistive circuit, the apparent power will be equal to the true power. For resistive-reactive circuits, the apparent power will always be larger than the true power.. ( Full Answer )

# Instead of KVA why not used KW?

The kVA (kilovolt ampere) is the vector sum of real + reactive power in an AC circuit. The kW (kilowatt) is a measure of the real power in that circuit. Inherently, a circuit will not require only real power, but also reactive power. Thus kVA is a more meaningful value when considering sizing equipm…ent (such as transformers, bus work, breakers, etc.) because this equipment must be sized for the total current drawn, not just the real power usage. ( Full Answer )

# How many kva is 21000 kw?

KVA is the vector sum of real and reactive power; put differently, KVA at a specified power factor will tell you how many KW you have: KW = KVA * pf You must provide a power factor or power factor angle (if angle, replace pf with cos (pf) in above equation) or total reactive power to calculate.

# Is there any difference between Kw and KVA?

Yes. KW is real power, while KVA is the sum of the vectors of real and reactive power. Put another way, KW output (of a generator, for example) can be defined as the KVA at a specific power factor.

# How much kva equal to kw?

0.8 x KVA =KW Answer The kilovolt ampere ( kV . A , not kva) is the unit of measurement for apparent power . The watt is the unit of measurement for true power . The reactive volt ampere ( var ) is the unit of measurement for reactive power . Apparent power is the vector sum of… true power and reactive power. ( Full Answer )

# How do you convert kva to kw and currents?

3 phase kVA = V*I*sqrt(3) Where voltage is line to line, and current is the actual RMS current flowing in the a wire. kW = V*I*sqrt(3)*Cos (phi), where phi is the angle between the voltage and current; Cos (phi) is also known as the power factor. kVA is the vector sum of kW (real power) and kV…AR (reactive power). As the equations above suggest, you must know the voltage to correctly calculate the current. ( Full Answer )

# Why transformer rating in KVA not in KW?

The volt ampere is a measurement of apparent power, while the watt is a measurement of true power. Apparent power is simply the product of voltage and current; the output of a transformer, therefore, is the product of its rated secondary voltage and its rated secondary current -i.e. the apparent pow…er of the transformer. The power supplied, in watts, is determined by the power factor of the load, so there is little point in rating a transformer in watts, as the designer has no means of knowing the power factor of the load it is to supply. ( Full Answer )

# How do you calculate kw to kva?

Watts = Amps x Volts x Power Factor. VA = Amps x Volts Watts and VA are equal only for resistive load where Power Factor = 1.

# Why motor rating in kw not in kva?

motors are rated in kw why because for motor the load is mechanical load. only active power converted to mechanical power is significant and in motor rotational losses,frictional and windage losses, we cant express these losses in VA, only expressed in KW. hence the motor rating in KW -ashok(BE)

# Why ac generator rating in kw not in kva?

A small AC generator rating may be specified in kW, because that is the maximum useful (real) power that can be produced by that generator. If the purpose of the generator is to run small power tools, some lights, maybe a TV or grill, this is a more useful value for the Average Joe to know. On bigg…er generators, KVA is usually specified with a specific power factor; Usually a power curve is provided (or can be requested) with these showing their operating capabilities at different power factors. At utility sizes, this is much more useful information (than just a kW or MW rating), as the real and reactive power must be controlled on the power system to keep everything in a stable state. ( Full Answer )

# How many kw in one kva?

If it's a simple resistive circuit, or a D.C. circuit, 1 kVA = 1 kW. Generally, it depends on your power factor. Since real power, P, is equal to the total power, S, multiplied by the power factor, p.f. Power factor is the cosine of the angle between the current and the voltage, O . So, P = S *… cos( O ) . ( Full Answer )

# Why alternators are rated in kva not in kw?

Because the generator has separate maximum ratings for voltage andcurrent. The VA rating is the product of those ratings. This isindependent of the load, which might have any power factor between0 and 1.

# Why transformerrated in kva but not in kw?

V X A = W .....from.. (P=IV) W = power V x A = apparent power

# What is the KVAR if kva is 1750 and kw is 1225?

The KVAR will be 1249.75, the power factor is .7. KVAR = sqrt [ KVA^2 - kW^2 ]

# How do you convert electrical power KW to KVA?

A: They are both the same the first is the product volts times amperes the second is related to volts and amperes also. The difference is the second term is used to rate transformers power output in terms of voltage to amperes. Example a 1kva means that you can expect 1kv at 1 ampere on the transfor…mer output . But here is the trick the transformer only put out 250 volts So now what It means is 250v at 4 amperes nothing has changed the power remains the same 1 kw To convert KW to KVA just leave the power factor (pf) out of the equation. Formula for Kilowatts = I x E x pf/1000. Formula for KVA = I x E /100. ( Full Answer )

# Why is the capacity of a transformer specified as KVA and not as KW?

Because its the product of the rated secondary voltage and ratedsecondary current, which results in volt amperes. To determine thenumber of watts, it's necessary to know the power factor of theload, which the designer has no control over.

# How do you change kw into kva?

In electrivity, KW can be converted to KVA with the help of power factor('phi'- greek symbol) Power Factor is a value dependent on phi. It can only lie between +0 to +1 Formula: (X) KVA = P.F x (X) KW. For an ideal system 1 KVA = 1 KW.......P.F = 1 For practical System Power in KVA = Power F…actor x Power in KW. Generally a system with non-mechnical parts (eg. Solar) gives 0.95 ( Full Answer )

# How many kw equals 1 kva?

For normal power factors (pf=80%), you have 0.8 kW for every kva.In general however, kW = pf x kVA. Where pf is the power factor, itis the cosine of the angular difference between the voltage and thecurrent of a circuit in alternating current circuits.

# How can you convert kVA to kW?

KVA = (Volts x Amps)/1000 Watts = (Volts x Amps x Power Factor)/1000 Power Factor is from 0 to 1 with 1 being related to a pure resistive load. Power factor is less than one for inductive devices like motors which are more likely to be rated in KVA or just VA. A KVA rating will therefore alway…s be greater than or numerically equally to KW rating. Another answer You are mixing VA (Volt Amperes) and Watts. The "k" means 1000. Watts = Volts x Amps x Power Factor VA = Volts x Amps Power Factor ranges from zero to one with one indicating a pure resistive load. Therefore, 1 kVA = 1000 kW when PF = 1. ( Full Answer )

# How do you convert KW to KVA in single phase?

In common everyday usage and in about 99% of the circuits you will work with, KW and KVA are the same value. However, Watts has a very technical definition that does not exist in every circuit, such as motors, transformers, and capacitors, but every circuit has volt-amps, or VA. The K just stands fo…r thousands in both abbreviations. More Information: VA is short for Volt-Amps, i.e. volts times amps, which may seem to be the same as watts. This is true only for resistive loads, where the phase angle of volts is the same as that of amps. In that case KVA is the same as KW. What happens with non-resistive or reactive loads, however, is that amps are not in phase with volts. In an inductive load, such as a motor, amps lags volts; while in a capacitive load, amps leads volts. In both of these cases, you cannot just multiply volts and amps to get watts, due to a phenomenon known as power factor; power factor being the ratio of apparent power to true power. To visualize this, you need to draw the power circle. Since WikiAnswers does not presently support graphic images, please take a piece of paper and follow along with me... Draw a circle. To make it easy to do the math, draw it centered at the origin, and pretend that it has radius of one. This way, the trigonometry is easy. Consider that the radius of the circle is VA, KVA, or MVA, what ever scaling factor you want. (Do not confuse this with the trigonometry trick where we also consider the radius to be one.) Now, pick a point on the circle. Twelve O'Clock is a purely resistive load, where volts and amps are in phase. Nine O'Clock is a purely inductive load, where amps lags volts by 90 degrees. Three O'Clock is a purely capacitive load, where amps leads volts by 90 degrees. In "normal" trigonometry, zero degrees is at 3:00 O'Clock, but, by convention, zero degrees when dealing with reactive power is accepted to be 12:00 O'Clock. Just keep the trigonometric identities straight in your mind. In practice, with normal electric motors and all other things considered, we see a point on the circle at about 10:30 or 11:00 O'Clock. Let's pick 10:30, to make the math easy. So, draw a line from the origin to the upper left at an angle of 45 degrees with respect to the Y-Axis. Label this line KVA. Notice that KVA is constant, no matter what the phase angle may be. Now, draw two more lines; one from the point on the circle at 10:30 O'Clock straight down, perpendicular to and stopping at the X-Axis - label this line KW, and one from that same point to the right, perpendicular and stopping at the Y-Axis - label this line KVAR. Label the angle of the first line with respect to the Y-Axis as phase angle. Positive meaning inductive, and negative meaning capacitive. Notice that, if you had a 45 degree capacitive load, intersecting at 1:30 O'Clock, the magnitude of the KVAR line would be the same, though positive instead of negative, and the KW line would still be the same. Now, power factor is KW / KVA, the ratio of apparent versus true. In this case, since we picked 45 degrees as the phase angle - to make it easy - the ratio is 0.707, or the cosine of the phase angle. A typical power meter will register less than the actual power. In the worst case of a purely inductive load, the power meter would register zero, though the KVA is still what it always was. The power meter is "lying", due to the power factor - energy is still being transferred - and the equipment must be sized to handle it - that is why transformers and other things are often rated in KVA instead of KW. Now, if you are interested, and most power companies, engineers, and electricians are, then look at KVAR. That is kilo volts-amps reactive. There is a KVAR power factor as well, simply the sine of the phase angle. In this case, again with 45 degrees, it is the same as the normal power factor, 0.707, however, we normally would call that -0.707, to differentiate between KVAR (inductive) and KVAR (capacitive). So, to answer the original question, "How do you convert KW to KVA", you simply divide by power factor, and to obtain that, you need to know the phase angle. It is simple trigonometry from there. Note that, if your phase angle is more than plus or minus 90 degrees, we are actually talking about a generator, instead of a load. In practice, the phase angle is more like 20 to 30 degrees, so the power factor would be slightly higher, and the reactive power factor would be slightly lower. Power companies penalize large customers for poor power factors by measuring it and compensating their power meters or accounts to consider the perceived loss in energy or, more correctly, the increase in actual energy use. Also, poor power factor causes degradation of voltage on power lines, so power companies compensate with capacitor banks, shifting the phase angle back closer to zero. There is no longer a need to penalize large customers for poor power factors since their billing is based on current, not Watts. This is why you see a very residential-looking meter on the side of very large buildings. There is a current transformer (CT) placed around each service conductor. Each CT is then wired with very small conductors into the current meter. Next time you go through a drive-through, notice the meter location on the back of the building. You will find it in close proximity to a junction box that contains the service conductors. A current transformer is nothing more than a larger version of a clamp-type ammeter used by electricians. ( Full Answer )

# Why transformer is read in rating KVA but not KW?

Transformers are rated in KVA which is equivelant to "apparentpower". Loads, {such as heaters, lamps, etc.} are rated in KW whichis equivelant to "real power". Things such as power factor andtransformer efficiency account for the diifference between the twovalues. KW's are what the load requires and… KVA's are the values ofthe input power required in order to serve a given KW load.Unfortunately the utilities charge for KVA not KW. It's not too unlike a glass of beer. The enjoyable part is the beeritself. However, you pay for both the beer and the foam at the topof the glass. ( Full Answer )

# How do you convert Kva-Kw?

To convert from KVA (kilovoltamperes) to KW (kilowatts) simply multiply by power factor. Power factor is the cosine of the phase angle between voltage and current.

# What is the difference between KVA and KW of a transformer?

VA is just volts x amps. Watts takes into account Power factor such that watts = volts x amps x Power Factor. Since the Power Factor is one for a pure resistive load and decreases with inductance. Therefore a transformer rated in VA indicates maximum power rating. The K is just a multiplier of 100…0. ( Full Answer )

# Is 1 kva 1 kw?

Yes, if the power factor (cosine of the phase-angle between voltage and current) is ' 1 '. In order for that to be true, the total load impedances on the line have to be pure resistive, with zero reactance. All of this stuff applies only on an AC line. On a DC line, voltage and current are … always in phase, the power factor is 1, and KVA = KW . ( Full Answer )

# Why is the transformer rated in kVA and not kW?

Because a transformer is rated separately for maximum voltage andmaximum current. Multiply the two together to find the rated kVA. Excessive current causes overheating in the copper wire windingsbecause of the resistance of the wire, while excessive voltagecauses overheating in the iron core becaus…e of eddy current losses. ( Full Answer )

# Why motor rating are in kw and not in kva?

Because the machines which use power i.e; load, are always rated in KW and the machines which produce power i.e generators, are rated in KVA. Answer A motor's mechanical load is expressed in watts (horsepower in North America), so the output power of the motor must also be expressed in watts (…horsepower in North America) so that the machine can be matched to its load. You cannot express a mechanical load in terms of volt amperes. ( Full Answer )

# Why the transformer rating in kva why not in kw?

A transformer has separate ratings for maximum voltage and maximumcurrent. Both limits must be observed. The maximum voltage is setby the magnetic flux density in the core, while the current limitis set by the size of the wire used in the primary and secondarywindings. Multiplying the two together g…ives the VA or kVA rating. ( Full Answer )

# Why transformers are tated in kva but not kw?

Because it is the current rating of the windings that determine the maxium load current, and the product of rated current and rated voltage, in a.c., is apparent power (in volt amperes), not true power (in watts). And, incidentally, the correct symbols are kV . A and kW, not kva and kw.

# How will convert kva and kw?

The kilovolt ampere ( kV . A , not 'kva') is the unit of measurement for apparent power . The kilowatt ( kW , not 'kw') is the unit of measurement for true power . The relationship between these two quantities is: true power = apparent power x power factor

# Why generator rating in Kw instead of Kva?

generators are limited by the amount of power available 1a at 1200v, 10a at 120V, 100A 12v all the same true power for resistive load generators usually fixed voltage so give 120v constantly almost no current with inductive load lots of current with capacitive load but will usually stall… the motor when power limit is reached ( Full Answer )

# Why are transformers rated in KVA and not in kW?

The watt is a measure of true power , which is theproduct of the supply voltage, load current, and load power factor.The volt ampere is a measure of apparent power , whichis the product of the supply voltage and the load current. A transformer manufacturer has no means of knowing the power fac…torof the load its transformer will supply. Accordingly, transformersare rated in volt amperes -the product of their ratedsecondary voltage and their rated secondary current. ( Full Answer )

# Can direct current kW be converted to KVA?

With a dc system the kW are always equal to the kV times the amps. It's only with ac that the kW are usually less than the kVA by a factor called the power factor.

# A load of 9.41 kVA is equal to what in kW?

For a purely resistive load with a unity power factor, 9.41 kVAwould equal 9.41 kW. However some equipment such as a motor willhave a power factor less than 1. If the power factor is 0.8 then9.41 kVA would equal 9.41 x 0.8 kW.

# What is the difference KVA and KW?

In an ac system the kVA is the product of the kV and the amps. Butin some loads such as electric motors the current is not in phasewith the voltage so some power flows from the load back into thesupply for a fraction of the ac cycle. That means that the averagepower flow in kW is generally less than… the kVA by a factor knownas the power-factor. The ideal power factor is 1 and power factorsof less than about 0.8 are not good because the current supplied,and therefore the power loss in the cable, is more than necessaryfor the given amount of power. In many cases the power factor ofhigh-power loads can be corrected by adding special components. ( Full Answer )

# What is total KW for an 250 kva Transformer?

A 250 kVA transformer can supply a maximum of 250 kW but only to aload with a power factor of 1. For other loads the maximum poweravailable is 250 kW multplied by the power factor.

# Why transformer rating is called kva not kw?

Because a transformer has separate ratings for the voltage and thecurrent. The two, multiplied together, give the VA or kVA ratingwhich is independent of any load that might be applied.

# How do you calculate transformer KVA if kw is given?

Usually transformers are rated in kVA but if kW is specified, thekVA must be assumed to be the same. The kVA often exceed the kW butit cannot be assumed in this case.

# Why motors and generator are rated in kva not in kw?

The output of a motor is always expressedin watts or kilowatts (except in the USA, where horsepower isused), never in kilovolt amperes. The output of a generator is expressed in voltamperes or kilovolt amperes (the product of its rated terminalvoltage and rated load current) because the man…ufacture has nomeans of knowing the power factor of the load to which it will beconnected. ( Full Answer )