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Electrical Engineering
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.
23,056 Questions
Why distribution transformer of 1000kva not called as 1mva?
There is no reason why it shouldn't be. However, the correct symbols are:
kV.A not kva
MV.A not mva
Out of phase means that the sinusoidal waveform of voltage and/or current is not exactly in step with the reference phase. Expressed mathematically, it means that the coefficient of the sine function for one parameter is not the same as the other parameter. One may be x, and the other may be x+120. (This is an example of two phases in a three phase power system.) Another example might be where voltage is x, and current is x-23. This would be a case of a power factor of 0.92, such as for a typical large induction motor with a reactive phase angle of 23 degrees.
How motor can control using timer contactor?
Control means, a timer cant control is speed directly, it can control its operation. A times will have NO nd NC contacts. Connect the motor in series with the timer contacts wrt desired operation
What is meant by leading and lagging pf?
Power Factor is the ratio of true vs apparent power, and comes into play with a reactive (inductive or capacitive) load. A purely resistive load, such as a light bulb or toaster, will have a power factor of 1 because the current is in phase with the voltage. An inductive load, however, such as a motor, will have a power factor less than 1 because the current lags the voltage. You could also have a capacitive load, with a power factor less than 1, but in this case the current leads the voltage.
AnswerThe terms, 'leading' and 'lagging' refer to whether a circuit's load current is leading or lagging the supply voltage. Current will 'lead' in resistive-capacitive (R-C) circuits, and 'lag' in resistive-inductive (R-L) circuits. So, a 'leading power factor' indicates a leading current, and applies to R-C circuits, while a 'lagging power factor' indicates a lagging current, and applies to R-L circuits.
If the decrease voltage and the resistance stays the same is current increased or decreased?
This question follows Ohm's law which states, "Current is directly proportional to the applied EMF (voltage) and inversely proportional to the current in the circuit.
<<>>
decreased
YES!!!!
If you have to add two alternating voltages how to add them?
A: Alternating voltages means the phase factor must be considered.
Where can one find more information about induction motors?
Someone that is looking to find information about induction motors can do so at the HappyWoodWorking website. There one can find a variety of information such as wiring a power switch, changing voltage or rotation and much more.
The power angle of a synchronous motor is affected by what two things?
the excitation voltage applied the power input to the prime mover
1997 Geo Metro Ls1 F1 fuse is breaking?
first make sure you have the right size fuse. if it keeps blowing then you will have to figure out where the extra current is coming from. start by checking the wires. make sure that none are broken or have bare wire showing. most of the time a wire rubs against something and gets a bare spot.
What is the reason to use open circuit and short circuit methods to find Transformer losses?
The transformer can be tested on open and short circuit to find the iron losses and copper losses separately, which uses a fraction of the power than having to run the transformer on full-load.
What is the meaning of electrical After Diversity Maximum Demand?
The maximum demand with regards to diversity is when an electrical device is running at its maximum capability. The diversity number is typically a percentage, so if a device is running at 80 percent diversity, it is running on maximum demand 80 percent of the time.
Is water an open or closed circuit?
Water is neither an open or closed circuit. There is no electrical circuit without a power supply and a load. With that said, pure water is not a good conductor of electricity; if other matter/ions are present in the water, the conductivity may be high enough to consider it a good conductor.
How much 6 watt per foot 240 volt heat tape can be put on a 20 amp 240 volt circuit?
A 20 amp 240 volt circuit can provide 4800 watts.
4800 watts / 6 watt per foot = 800 feet.
What action results in an ampere of current?
MOTION OF A CHARGE (1C) IN A TIME OF 1S RESULTS THE AN AMPERE OF
CURRENT TO FLOW..... on a broad way
I= q/t
q=ne
so I= ne/t
so put e = charge of electron, t=1s I= 1A then u will get how many electrons are flowing to constitute the current of 1A (e= 1.66 X 10-19 (-19 is in rays to power of 10)
Derive the equation for average value of DC?
The equation for the average over time T is integral 0 to T of I.dt
How much electricity is consumed by a 15 hp motor being used for irrigation purpose?
To answer this question It must be assumed that this is a three phase motor. There is no listing for a single phase motor which would be in the neighbourhood of 80 amps. That said, the electrical code book rates a three phase 15 HP motor, for calculation purposes, at 460 volts at 21 amps. For an accurate reading use the motor's nameplate amperage reading.
The equation for kilowatts is, kW = Amps x Volts x 1.73 x PF /1000. kW = 21 x 460 x 1.73 x .9 = 15041/1000 = 15.04 kW. PF (power factor) constant used is .9.
Take the kilowatt calculated, times the amount of hours operated will give you kW hours. It is this value that you are charged on from the local utility company. Multiply this value times the charged rate of the utility company per kilowatt hour and you will have your answer.
The utility company's charge rate can be found on your power bill or give them a call to find out what it is.
What information are required to establish a substation?
To establish a substation, essential information includes the location and site suitability, which involves assessing land use, environmental impact, and accessibility. Technical specifications are needed, such as voltage levels, equipment requirements, and capacity. Additionally, regulatory approvals and permits are necessary to comply with local, state, and federal regulations. Finally, a comprehensive financial assessment and project timeline must be developed to ensure feasibility and funding.
