Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.
What is IEEE-738? IEEE-738 is a widely used and accepted method of calculating the ampacity (thermal rating) of transmission conductors under specified weather conditions. Conductor parameters and major weather conditions are input into the method. Major weather conditions affecting rating include air temperature, wind speed/direction, and solar input, although there are some other minor effects. Both steady-state and short-duration ratings can be calculated. IEEE-738 is based on both experimental data and theoretical equations. The full… Read More
B/c a voltmeter is connected in parallel with what you want to measure the voltage over, and if it had a low resistance, the current would flow through the voltmeter instead, changing the circuit and givign you a measureing error.
Concrete is stronger than cement.It is composed of aggregates (sand and gravel) and cement; and may be cast with reinforcing bar within it (reinforced concrete). Cement is only a part of concrete. Cement has no tensile strength while concrete has compressive and tensile strength.
A: The AC line 60 hz constantly goes to zero every 8.33 milliseconds
Resistance is the ratio of voltage to current, R = V/I. You can now manipulate this equation and find out the answer for yourself!
tube light woks like a tube light....
If 12 volts are being applied to a resistance of 3 ohms, _______ amperes will flow.
A: Usually smoke and smell
A: The diodes are not exactly the same so this unbalance will give an false output.
the current iin each lamp will be smaller than before, but the voltages passing through each lamp will stay the same as before.
Lead the voltage waves
Squirrel Cage Induction Motor Disadvantages: Some of disadvantages or demerits of squirrel cage induction motors are listed below: Main disadvantage of squirrel cage induction motor is that they have poor starting torque and high starting currents. Starting torque will be in the order of 1.5 to 2 times the full load torque and starting current is as high as 5 to 9 times the full load current. In slip ring induction motors, higher starting torque… Read More
Start by using Ohm's law. 10 volts and 200 microamps requires 50,000 ohms. From that, subtract the impedance of the meter. Place the final resistor in series with the meter. Add a resistor in series of such a size that when there is 10v it will allow 200 u amps to flow.
in series voltage is measured in one way but in parallel voltage is measured in many ways
30 ohms Answer An incandescent lamp doesn't obey Ohm's Law, because the ratio of voltage to current changes as the supply voltage is varied. All you can say is that, when the applied voltage is 9.0 V, then the resistance will happen to be 30 ohms. If you change the applied voltage to some other value, then you will find the resistance will have changed too. Ohm's Law isn't a universal law; in fact, most… Read More
Analysing a circuit with a shorted component need specialised electrical test equipment.
You can stop an electric current by disconnecting the circuit from its supply voltage.
A three phase supply has a 120 degree AC voltage difference between phases. For example: a 240VAC three phase circuit has three phase (hot) leads that measure 120VAC to neutral or ground. The voltage difference between two hot leads is 208VAC (120 * tangent of 120 degrees).
Since it the rate at which the flux is cutting the conductor determines the (EMF) electromotive force which is the voltage, the best way to control voltage is to adjust the speed of the engine through the governor, coupled with an automatic voltage regulator.
Capacitors are said to be connected together "in series" when they are effectively "daisy chained" together in a single line. The charging current ( iC ) flowing through the capacitors is THE SAME for all capacitors as it only has one path to follow. Then, Capacitors in Series all have the same current flowing through them as iT = i1 = i2 = i3 etc. Therefore each capacitor will store the same amount of electrical… Read More
There is no such thing as a DC bulb or an AC bulb. All [incandescent] bulbs could be powered by AC or DC. The real problem is that bulbs designed for use in a DC environment will be rated for the voltage they work best at. This is typically in the range from 6VDC to 24VDC. Bulbs designed for AC use are designed to work at 11OAC (US) or 220AC (UK). With DC the voltage… Read More
the relation among work, charge and potential difference in a circuit is W = V.Q V = W/Q where W= work done , V=potential difference and Q= charge
A: Either voltage or current if not supplied by a constant source will make either one sag
1)Short circuit test is performed at rated current. As the rated current on high voltage side is much less than low voltage side, so the rated high voltage side current is easily achieved compared to low voltage side. 2)Also because we cannot short circuit high voltage side, as, if we short circuit high voltage side, voltage of high voltage side essentially falls to zero and since VI=constant, so the high voltage side current will be… Read More
they are anywhere from 20 bucks to over a hundred or two. i would go with one around one hundred, you can get a fluke or blue(snap-on) one for that much
Here you go: Source #1
It flows from higher potential to lower potential. simply opposite to direction of electrons flow...
Since resistance R = V/I ,when resistance increases ,current will be decreased and potential difference will be increased
you play it by beating the games
The resistance of pure metallic conductors increases with temperature, because the resistivity of these conductors increase with temperature.
Transformers can be connected in parallel, if they have the same primary and secondary voltages and equal operating frequency.
we have I = q/t or amount of electric charge q = I.t here I = current = 0.2 A t = time = 1hr = 3600 s so, q = 0.2 x 3600 thus, q = 720 C
No, an electrical bill is based on consumption of watts. Watts are the product of amps x volts. For a device or motor that uses say 1200 watts and using the formula W = A x V you can see 1200W = 10A x 120V at 120 volts, and now 1200W = 5A x 240V at 240 volts. It still costs the same to run the motor no matter what voltage you use. Motor nameplates… Read More
A: ACTUALLY it is not .If it is is because the source is constant and since the parallel load are across it seems like the voltage is constant. in a series circuit every different Resistance will have a different voltage across it
If you had three bulbs in series with resistances of R1, R2 and R3 then RTotal = R1 + R2 + R3.
In a perfect inductor (one with no series internal resistance), the current lags the voltage by 90 degrees. If the inductor has series internal resistance, then the current will lag the voltage by less than 90 degrees - the more the resistance in series with the inductor, the smaller the angle. The tangent of the angle can be found from the ratio of the inductive reactance of the inductor to the DC resistance of the… Read More
helo moto, kala puda, mayada, kutar,
We did this experiment in class, the more batteries added, the brighter the bulb will become!
because gravity control is only used in vertical position only......it has less tension
There are situations where the secondary of a transformer is not grounded and the neutral is not connected to the neutral of the primary. This can cause a potential shock hazard so the secondary side needs to be protected.
The use of a star delta starting is determined by the horsepower of the motor. It is the utility company that has to be asked - What is their policy on how much horsepower will they allow for across the line starting. These days pump installations usually opt for VFD controllers. This will allow the pump to ramp up to speed and ramp down in speed to stop. Using variable frequency drives totally eliminates water… Read More
Think about it. Assuming a total transformer capacity of 60 kV.A, how could it possibly supply a load of 100 kW?
A: Peak voltage is RMS multiplied by a factor of 1.41
E = I R = 22 x 7 = 154 volts.
A balanced bridge has zero volts across the two test nodes, while an unbalanced bridge has non zero volts.
A: Alternating voltages means the phase factor must be considered.
Potential difference equals current multiplied by resistance or E = IR therefore the answer to your question is 25 volts
A: pay attention to current flow and assign +/-using algebraic mathematics
any gadget won't work, as no current would be able to pass due to lack of electric potential difference
A: It can be positive or negative DC pulsating waveform
Transformers are devices that use the principle of coupled magnetic fields to step voltage up or down, or provide DC isolation in circuits. A signal transformer is a special application of a transformer that is used to couple a signal from one circuit into another circuit. The signal might be stepped up (or amplified), or it might be stepped down, or it might be coupled without an increase or decrease simply to provide isolation, impedance… Read More
The formula to find amps is: I = (KVA x 1000)/(E x 1.73) I = (2500 x 1000) / (480 x 1.73) I = 2500000 / 830.4 I = 3010.597A
Parallel or Series Connections for Batteries To increase current [measured in Amperes], you connect batteries in parallel. To increase voltage, you connect batteries in series.
If they were in series you would have no power every time a tool or light bulb broke down
A piece of wire stretched such that its length increases and its radius decreases will tend to have its resistance increase. The formula for this is: R = ρL/A where ρ = resistivity of the material composing the wire, L = length of the wire, and A = area of the conducting cross section of the wire. It can easily be seen that as area decreases resistance gets higher. In the case proposed the wire… Read More
The diac conducts in both directions at approximately the same voltage, making it unsuitable in an AC to DC supply. The triac also conducts in both directions, based on a gate voltage which is slightly different in the two usable quadrants. That is why the diac is often used to trigger the triac - it makes the two conduction cycles more symmetric. In both cases, the diac/triac does not make sense for an AC to… Read More
There are many questions you may be asked at a job interview. Most will be concerned with your ability to carry out the tasks you will be assigned and your qualifications and experience. Others will be of a more personal nature to ascertain your personality and ability to work with the existing team.
A voltmeter is a device to measure the voltage in a electric circuit, and must have be connected in parallel to it.
I thought the resistance of a material, with few exceptions, increased with temperature. Anyone else want to chime in???
To use a star delta starter, the motor must be a three phase six wire motor. The extra wires out are the wires that are usually terminated in the motor housing as the star point. The starter, when energized, brings the star contactor in and closes the star point coil ends. An external timer times out after the motor gets up to speed in the star connection and drops the star contactor and closes the… Read More
This will depend on the work the person is performing, and their approach distance to work that other persons are performing. High voltage work that creates an arc-flash potential may require electrical shielding, and clothing and PPE that will mitigate the blast and high temperatures. This could include high temperature protective clothing, face protection rated for high temperatures, and hearing protection. The answer will be driven by the nature and location of the work performed… Read More
The frequency of emf generated per rotation of the rotor depends on the number of poles on the rotor and on the field. Please restate your question. For the two pole / two pole case, an atypical configuration, but good for illustration, 3,600 RPM would generate 60 Hz.
Use Ohms Law: voltage = current x resistance.
100 volts of potential will induce a current of 4 amperes through 25 ohms of resistance. Ohm's law: Voltage = Current times resistance
The reading of 14.65 on the 20k setting means 14.65K Ohms, and you probably need to go back and re-read the instructions for the meter. If, for instance, you used a 2M scale, if you had one, you would get 0.014, but the result would not be very accurate, as you need to pick a range that is close to maximum reading for that range. It is normal procedure to start with a high range… Read More
Differential compounded generators are used in Ward Lenard motor generator loops. The shunt fields on these generators are separately excited and when the shunt field polarity is reversed by the controller the series field helps drive the generator voltage to zero thus aiding in the reversal of current.
A circuit breaker is basically a switch (albeit one designed to disconnect a fault current), so it simply opens or closes a circuit. It has no effect on the voltage.
A circuit is electrically grounded when charges are able to flow directly from the circuit into Earth in the event of a short circuit. Answer You are probably thinking about what is called a 'chassis ground' or 'chassis earth'. Cars' electrical systems are examples chassis ground systems. Using a car as an example, one terminal of the battery (usually the negative terminal) is connected directly to the metal body (the 'chassis') of the vehicle. The… Read More
There are only two ways this can be accomplished. The most economical way to measure three phase voltages is with one meter and a rotary switch, that has an off position, to connect the one meter to each of the three phases one at a time. The other approach is to have three volt meters connected to each phase to measure each phase individually. With the three meter approach you will still need a switch… Read More
Output voltage is higher!!!
AC can be converted into DC by using diodes to block half of the current sine wave (half-wave rectifier) or divert half of the current sine wave (full-wave rectifier) so that it travels in the same direction as the other half of the sine wave, you can also use an AC motor to drive a DC generator.
V-Drums, for instance, have an output of 330 ohms, making them low- medium-impedance.
Some three phase circuits use a neutral connection because they connect the phase loads from phase to neutral, with neutral being a common return. Some three phase circuits do not use a neutral connection because they connect the phase loads from phase to phase. The former is called a wye connection (you can have a three phase load connected to a wye system without using the neutral), while the latter is called a delta connection… Read More
The capacitive reactance of a capacitor increases as the frequency decreases.
Yes, it is called a fly back transformer. See related links below
DC versus AC. The vast majority of electric power transmissions use threephase alternating current. The reasons behind a choice of HVDC instead of AC to transmit power in a specific case are often numerous and complex. Each individual transmission project will display its own set of reasons justifying the choice. A. General characteristics The most common arguments favouring HVDC are: 1) Investment cost. A HVDC transmission line costs less than an AC line for the… Read More
In the US or Canada, a 120 outlet has parallel blades for a 15 ampere circuit, and parallel blades with a T shape blade on neutral for a 20 ampere circuit, and parallel blades with a T shaped blade on hot for a 30 ampere circuit. A 220 outlet has horizontal blades. The device cord should have a matching plug. If you have added a plug or an outlet, it is your responsibility to find… Read More
Advantages: They prevent unauthorized access or at least make it more difficult Disadvantages: They require resources to run, add complexity to the IT environment and require effort by those using the systems.
curent remain same in series and get diverted according to the impadance in parllal.
One kilowatt is equal to zero amps. . answer 2 What you want is Ohms Law. Which is the basic electrical formula. I = E/R where I is the current in amps, E is the voltage in volts, and R is the resistance in ohms. And this also can be reformulated to read W (watts) = I2 x R, or W = I x E. So you see it all depends on the resistance. And… Read More
If it were just 12V to 5V we would be talking about a simple regulator. Since we are also talking about 1A to 2A, we are talking about some kind of inverter, perhaps a pulse width modulated power converter.
Pitch has to do with how the phases are wired on the stator. Depending on how this is done, 3rd harmonics may add or cancel out in each phase, resulting in no to significant third harmonics in the neutral, or phases if wired in Delta.
Electric circuits are everywhere. In your car, home, office, your digital watch, your cell phone and on and on. The electric circuit that makes up your cell phone provides the local user interface and connects to a cell tower to allow you to make and receive calls.
If it jumps from 14 amps to 19 amps that could simply be your air conditioner compressor cycling off and on. Even if you don't use the air conditioner, in some vehicles the compressor cycles. If, one the other hand, you are really looking at a volt meter, then 19 volts is bad, and could indicate a loose connection or bad regulator.
the voltage across each is the same
No. It is more like a definition of resistance. As such, it is always true - but note that some devices have variable resistance (depending on the current, for example). Another Answer Ohm's Law states that 'the current flowing through a conductor at constant temperature is directly proportional to the potential difference across that conductor'. Ohm's Law is by no means a universal law, and only applies to those conductors or devices where the ratio… Read More
Characteristics of parallel connection.
Usually RFID tags would get the power from the reader.
The voltage drops across each resistance sum to the total voltage.
To answer this question the voltage of the cooker is needed.
The unit of Current is Ampere. Abbreviation of Current is 'I' and that of Ampere is 'A'. The unit of Resistance is ohm. Abbreviation of Resistance is 'R' and that of ohm is the symbol of 'omega' or the symbol of 'ohm'.
The change over time will vary with the type of motor, size of motor and the connected load to the motor. The time should be adjusted so that the motor is up to speed and stabilized at the star speed. It is at this point that the change to delta should take place. One thing to note is, do not leave the motor running is the star position any longer that it needs to.
You don't need a formula. All a.c. voltages and currents are expressed in r.m.s. values which are directly equivalent to d.c. voltages and currents. So, for example, 100 V a.c. is exactly equivalent to 100 V d.c., and, say, 20 A a.c. will do exactly the same amount of work as 20 A d.c.
Step-down transformer is used at grid substations for feeding various substations which further step down the voltage for feeding distributing transformers and further step down transformers are used to supply the voltage for the consumer uses
Step up Transformer is used in the long distance transmission. Here is the example : The generating stations are located at favorable places, generally quite away from the cities. At the generating station , the A.C. generator produces moderate voltage (say 11kV). It is stepped up to a high voltage (say 220kV). Prior to transmission. The A.C. power is then transmitted at this high voltage . Upon arrival near the outskirts of the city ,the… Read More
To answer this question the voltage of the oven is needed.
746 watts = 1 HP. Another Answer To some extent, you are trying to compare apples with oranges. A horsepower is simply the Imperial unit of measurement for power which, in SI, is measured in watts. So you can only convert horsepower to watts. There are 746 watts in one horsepower. The volt ampere is used to measure a different quantity, called 'apparent power', which is simply the product of the supply voltage and load… Read More
A line trap is essentially a band rejection filter. It is tuned to a specific frequency and blocks that frequency. In the power transmission system, these are often used to limit the transmission of communication signals to specific lines; say a 100kHz signal is injected on either end of one line for the sake of communicating between subs; the wave trap is used to stop this signal from propogating to other lines and other subs… Read More
200WV is the working voltage of the capacitor. This is the value that should not be exceeded between the two terminals. 470uF is the capacitive rating of the capacitor. It means 470 micro Farads, or 0.47 Farads.