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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
What is mean electrical power triangle?
the electrical power triangle is as shown in the above pictiure
Voltage current relation in passive circuit?
in passive circuit it depends on the type of load 1. if the load is purely resistive the voltage and current will be in phase 2.if the load is purely inductive the current lags the voltage by 90 dgree 3.if the load is purely capacitive the currents leads the voltage by 90 degree
What are the benefits of electricity?
The technological benefits of electricity are just about endless. Without it, there would be no street and home lighting, computer technology, hospitals, cars, home appliances, and a myriad of other things.
- Electricity is the most neat and clean form of energy.
- It is environmentally friendly.
- It can easily be transported from one place to another with considerably high efficiency than any other form of energy.
- Electricity in its original form is seldom used, however it has the ability to be transformed from one form to another form very easily. You might have noticed it in your daily life, electrical energy being transferred to light energy (e.g. light bulbs), to mechanical energy (e.g. washing machines), to heat energy (water heater), etc.
- Our body works with an electrical shock
- with the help of electricity we are able to lighten our homes and other places
What has to occur for an electric motor to spin freely?
In order for an electric motor to spin freely you will have to make sure you have one thing. You have to have the electric current for the motor to run freely.
Why current will reduces after motor runs in constant?
Because the slip angle between magnetic fields decreases as the rotor comes up to speed.
What is the advantage by using 8 pole motor instead of 6 pole motor?
The number of poles in a motor will determine the speed of that motor. n=speed, f=frequency, p=# of poles. n=(120f)/p
So a 6 pole motor is rated to operate at n=(120*60)/6=1200 rpm. assuming 60Hz frequency
Or a 8 pole motor is rated to operate at 900 rpm.
Of course due to slip the rotor will always spin slightly slower.
What happens when a solar cell cannot supply enough current to a circuit?
the circuit might not operate properly. but shouldn't effect the circuits them self.
Why does a light bulb shine light in more directions than a flashlight?
A light bulb and a flashlight are the same basically. However if you`ve ever looked at the front of a flashlight ( dont do this when its on) you will see that the front is mirrored. So a does actually shine light in all directions but the mirrors reflect the light so as to send it forward where as the light from a light bulb is unobstructed.
There is no such a thing as a thermocouple volt meter. A analogue or digital millivolt meter or volt meter is connected across a shunt or parallel with the shunt to measure the current through the resistor. Say the resistor value = 1 Ohm, then by using the Ohm law formula to calculate the current, say the voltage (voltage drop), read on the volt meter is 1.5 Volt that is R*V = A that is, 1Ω*1.5V = 1.5 Amp.
Any type of DC volt meter, analogue or digital can be used to measure the voltage across a capacitor if the value of the capacitor is large enough that reading will be true RMS. as long as the supply current (EMF Power) are larger than the load current.
Coaxial Qr is a coax cable that has been developed to met the demands of broadband or internet. At the moment it is considered to be the best of all the coax cables out there as it is very flexible and reliable.
For 225 kw motor what is the amps star and delte and what is the cable size required?
Need to know what the voltage of the motor is.
Why do transformers work only work on an AC supply?
Transformers only work on ac supply because it principle is mutual induction. DC supply has constant magnitude whereas AC has alternating magnitude. so we can step up or step down current/voltage in transformer in ac only.
How old was martin cooper when he invented the first cell phone?
Martin Cooper was born December 26, 1928
The cell phone was invented in 1973
That would make him about 44 or 45, depending on what day it was invented....
Harmonics in three phase why not in single phase?
Harmonics are the result of the current waveform being distorted by a non-linear load, such as a computer power supply or a motor control drive (VFD). In a commercial setting (which is usually 3-phase), harmonics cause unwanted current to flow which does no useful work, yet must be accounted for when sizing conductors, transformers, etc. Harmonics are certainly not limited to 3-phase systems, however. Any non-linear load, even single-phase, causes harmonics. Your computer, television, and microwave oven probably create harmonics. In a residential setting though, there are not enough cumulative harmonic currents to worry about. Unless you have 50 computers at your house...
Can you use Peugeot 405 windscreen wipper motor to work on a Peugeot 306 car?
Yes. Most peugeot parts are interchangeable.
: This seems like a question from an electrical course, and is probably best answered by your course materials. : It's your test question, not ours, and there won't always be someone else to ask for the answer. Earn your diploma.
Is it normal to see sparking on the outside of a high voltage - say 10 kV - transformer?
Well it depends on what type of transformer you are talking about, but usually, no it is not normal.
Which powerful electrolytic capacitor or mylar capacitor?
- an electrolytic typically will have more capacitance than a mylar
- a mylar will typically have a higher breakdown/operational voltage than an electrolytic
Which were you looking for, or did you want something else?
Why clip-on meter show the 3 phase current is zero?
This question needs some more information. The obvious answer would be that there is no load, thus no work being done which equals no current. There is also the possibility that the clamp meter is across all three phases simultaneously (i.e. a multiconductor cable) which under the correct conditions might not show a cummulative current of zero (each current phase is 120 degrees out of phase. using vector math concludes a cummulative current of 0), or the conductor is shielded not allowing the measurement of the electrical fields. This assuming the clamp meter is measuring a self generated interference signal to measure the fluctuations in the electrical field of the conductor.
