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Divide Power Load by "Power Factor"
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∙ 15y ago
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What should you do with a power supply if it is too hot to touch?
Find out what the VA capacity of the power supply is and then add up the connected load in VA (volts x amps). If the load totals are greater that the VA power supply capacity then this is where the heat is coming from. The power supply is overloaded. Remove some of the load or get a bigger capacity power supply.
What types of circuit load in which the apparent power is greater than real power?
Apparent power is VA. Real power is W reactive power is VAR. Under an inductive+resistive load the VA is higher than W
How many vA equal to 1watt?
In a.c. circuits, the watt is used to measure the true power of a load, and is determined by multiplying the supply voltage by the load current by the power-factor of the load. The volt ampere is used to measure the apparent power of a load, and is determined by multiplying the supply voltage by the load current. So the relationship between the watt and the volt ampere depends on the power factor of the load. For example a 100 VA load with a power factor of 0.8 (leading or lagging) will have a true power of 80 W.
What is 500VA?
The symbol, V.A (not 'VA'), represents 'volt amperes', which is the traditional unit of measurement for apparent power, where apparent power is the product of a load's supply voltage and its load current. Expressed another way, apparent power is the vector sum of the load's true power (in watts) and its reactive power (in reactive volt amperes).
How you find ups watts and give detail about VA?
UPS power is not specified in watts.However VA is the equivalent of watts, assuming no phaseshift in the load.
Define the electrical term VA?
'VA', or more correctly, V.A, is not an electrical 'term'. Rather, it is the symbol for 'volt ampere', the unit of measurement for a quantity called 'apparent power'. This is the product of the supply-voltage and load current for an a.c. load.
What is VA rating?
VA Rating stands for Volt-Ampere Rating, It is the basic unit of Alternator or Transformer. This is so because in AC System Power(P) is the product of Voltage(V),Current(I)and Power Factor. Power(P) = Voltage(V) * Current(C) * Power Factor But power factor of the load is never constant and depends on the type of load. So to resolve this problem power ratings of the above mentioned machine is always rated in VA or KVA and its the product of voltage and current.
Why transformers are called in MVA?
1. POWER TRANSFORMERS ARE "RATED" IN MEGAVOLT-AMPERES" NOT "CALLED" 2. SMALL TRAFO ARE RATED IN VOLT-AMPERE (VA) --- 0 TO 999 VA 3. DISTRIBUTION TRAFO ARE RATED KILOVOLT-AMPERE (KVA) --- 1000 TO 999,999 VA 4. POWER TRAFO ARE RATED MEGAVOLT-AMPERE (MVA) --- 1,000,000 VA UP POWER = VOLTAGE X AMPERES = VA POWER = VOLTAGE X AMPERES X P.F.(1) = VA IT IS NOT RATED IN WATTS/KILOWATTS/MEGAWATTS FOR THE LOAD IS NOT DEFINED FOR THE END USERS OR DESIGNERS AND THE POWER FACTOR IS ALSO UNKNOWN. TO BE SAFE, THEY USE 100% P.F. (UNITY) OR 1 FOR RESISTIVE LOAD THATS WHY THE RESULT IS ONLY VOLT-AMPERE. MOTOR OR INDUCTION LOAD ARE USUALLY LESS THAN 1.
How do you differentiate inductive loadcapacitive load resistive load which basics?
For an inductive load, the current lags the voltage by 90 degs. Hence the power factor for an inductive load is 0. For a capacitive load, the current leads the voltage by 90 degs. Hence the power factor for a capacitive load is 0. For a resistive load, the current and the voltage are in phase. Hence the power factor for a resistive load is 1.
Will transformer heating be approximately the same for resistie inductive or capacitive loads of same VA rating?
Yes because the transformer heating (power losses) depend on the load current and the load voltage. It can be assumed that the voltage stays more or less constant, therefore the iron loss is also constant. The copper loss depends on the square of the load current. So it is the VA of the load that determines the power loss and any heating.
How many watt in 250 VA?
Watts (W) is calculated by multiplying Volts (V) times Amps (A), so 1W = 1VAAnswerIn a.c. circuits, the watt is used to measure the true power of a load, and is determined by multiplying the supply voltage by the load current by the power-factor of the load. The volt ampere is used to measure the apparent power of a load, and is determined by multiplying the supply voltage by the load current.So the relationship between the watt and the volt ampere depends on the power factor of the load. For example a 100 VA load with a power factor of 0.8 (leading or lagging) will have a true power of 80 W.
Are kilowatts a measure of resistive load capacitive load inductive load or impedence load?
Watts or kilowatts are units for measuring power. Specialy by alternating electric curent Watt is only for the resistive component. No power loss occurs in a ideal inductor or capacitor. The curent for an given power is minimal when V an I are in fase, when fi is 0, and the powerfactor cos fi is 1. The generator power is P (VA) = V*I The active power is Pa (W) = V*I*cos fi The reactive component Pr (VA) = V*I*sin fi (see related question)
