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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
Will a 370 VAC motor run using a 440 VAC capacitor?
If the motor is rated at 370 v and the supply is 370 v, the capacitor needs to be rated at 370 or more volts, so a 440 v capacitor will be OK.
What measures electrical resistance?
an ohm meter OR multimeter is used to measure the electrical resistance...
How does a transformer change voltage and current?
A welding transformer uses the alternating current supplied to the welding shop at a high voltage to produce the low voltage welding power
Is diode voltage controlled device?
RPS is only the voltage& power controlled device. it can only used for set the input for our wish
A device which can change its output according to the voltage supplied to it is called a voltage controlled device.ex. a voltage controlled current source,or a field effect transistor.
In a voltage controlled current source the output current changes as the voltage supplied to it changes.
What is the physical meaning of time constant?
Physically, the constant represents the time it takes the system's
step responseto reach
of its final (asymptotic) value.
Is aluminum a good conductor of heat?
Aluminium is a metal and metals are good conductors of electricity. Metals also tend to conduct heat,sound and energy.
Why is it dangerous to climb electricity pylons?
Because you can touch the live wires and the voltage can kill you.
CommentIt's quite unnecessary to 'touch' the live conductors. Approaching them within a few metres (depending on the voltage) will be sufficient for the high voltage to 'flash over', and inflict fatal burns. And if the burns don't kill you, the resulting fall will certainly finish you off!
Voltage, along with electric pressure, electric tension, and electrical potential difference is measured in units of electric potential. This can be joules per coulomb or volts.
Answer
First of all, there is no such thing as a 'voltage difference'. Voltage is already a 'difference', as it is an alternative name for 'potential difference'! 'Voltage difference', therefore, would mean 'potential difference difference', which makes no sense!
The unit for potential and potential difference (voltage) is the volt, which is equivalent to a coulomb per second.
What is difference between cooling load and heating load?
Cooling Load is the amount of energy that is to be extracted from a house to develop a conditioned environment. There are two types of cooling loads i.e, sensible cooling load and latent cooling load....
Heating Load is the amount of heat that is to be supplied to a house in order to increase its temperature to maintain desired temperature...
Why voltage across capacitor cant change instantaneously?
Capacitors resist change in voltage. By definition, the equation is dv/dt = i/c, or rate of change of voltage in volts per second is current in amps divided by capacitance in farads. In order for the voltage to change instantaneously, then dv/dt must be infinity, which means i/c is also infinity. If capacitance is non-zero, then current must be infinity. Since there is no perfect voltage source, or no resistor or wire with perfect zero ohms, then it is impossible to have an infinite current, so it is impossible for the voltage across a capacitor to change instantaneously.
What is the resistance of a parallel circuit with resistance of 2 ohms 4 ohms 6 ohms and 10 ohms?
R = 1/[1/2 + 1/4 + 1/6 + 1/10]
Add up the reciprocals of the resistances, and take the reciprocal of the answer.
What is the difference between a differential circuit breaker and a circuit breaker?
A circuit breaker is a device that opens its contacts in order to open the circuit in case of current overload. A differential circuit breaker is a device that opens the circuit in case of leakage (current measured on the phase line is differentthan the current returned to neutral line); therefore protects users from electric shocks.
To more understand how it operates, consider the following:
Say that your electrical wall outlet is connected to a differential breaker. When plugging let's say a hair dryer to it, the current traveling on the phase line (going into the hair dryer and out to the neutral line of the wall outlet) equals but in reverse direction of the current returned to the neutral line, thus the difference is zero. Now let's say this hair dryer got faulty and fraction of the current coming from the outlet phase line travels through your body and return to earth (considering that you are not electrically isolated from the ground). Thus the current in neutral line is less than the current on phase line; at this moment the difference is not zero and breaker opens to protect you from getting electrocuted.
What is the Difference between resistive and capacitive load?
when a resistive load is applied there is no phase angle difference between voltage and current. when a inductive load is applied there is phase difference between voltage and current. current lags voltage by an angle of 90 degrees for pure inductive load
What is the color code of a 50k ohm resistor?
Green, Black, Orange, (gold / silver)
Green = 5
Black = 0
Orange = x10^3
50x10^3 = 50,000 or 50k Ohm
How do you identify the collector and emitter terminals of a transistor?
Most Digital Multi-Meters (DMM's) have a diode test function the symbol looks something like this >| (picture the greater than sign as a black triangle pointing to and touching the redline).
Initially you should practice on a known good transistor, so you'll be able to tell if you have a bad one.
1) Ensure the transistor is out of circuit.
2) Set the DMM to the diode function.
3) Touch the positive (red) and negative (black) probes to any two leads on the transistor until you get a reading other than infinity.
4) Once you get a reading leave one of the probes on one of the leads (it doesn't matter which one).
5) Take the other probe and touch the third lead. If you don't get a reading other than infinity go back to step 4, this time leave the other probe on the lead it was originally on, when you got the reading other than infinity.
6) Now take the other probe and touch it to the third lead, you should get a reading other than infinity. If not, go back and repeat steps 3-6, but start with 2 different leads, until you can leave 1 lead in place and get a reading other than infinity on the other 2 leads.
7) If you kept the Positive lead in place you have an NPN transistor. If you kept the Negative lead in place you have a PNP transistor.
8) The probe you left in place denotes the Base.
9) On the probe that you swapped, the lead with the lower reading is the Collector and the lead with the higher reading is the Emitter.
We know that Voltage = Current x Resistance, so if E = I x R, then E = 20 x 12 = 240 volts, and the dryer must be plugged into a 240 volt outlet.
What are some advancement Possibilities for promotions in the electrical engineering business?
derkader
Why are electrical circuits important?
Yes! Electricity is so imporatant. Think about it, if the power go's off in your house, it seems pretty dark. Electricity circulates in the power lines that go's underground and connects to different types of other cords to give us electricity! Well I hope that answer helped!
Surge impedance loading of 400kv line?
400KV transmission line surge impedence loading is depent upon the conductor type but its arount 600mw
400KV transmission line surge impedence loading is depent upon the conductor type but its arount 600mw.Permissible Line Loading as per CEA Standards
+/- 500 kV HVDC bi-pole line=Pole Capacity X Number of Pole in service
765 KV line having 4 X 686 sq. mm conductor =2250 MW per circuit
765 KV line having 4 X 686 sq. mm conductor operating at 400 kV =614 MW per circuit
400 KV line having 2 X 520 sq. mm conductor with shunt reactor =410 MW per circuit
400 KV line having 2 X 520 sq. mm conductor without shunt reactor =533 MWper circuit
400 KV line having 2 X 520 sq. mm conductor operating at 220 kV =155 MW per circuit
220 kV line =132 MW per circuit
132 kV Line =50 MW per circuit
source:http://www.mahatransco.in/oa/draft_procedure_calculation_transmission_availability.shtm
Why is the voltage stepped up prior to the transmition across the national grid?
Electrical generators work at about 11,000 volts which is not enough to transmit power over long distances over about 5 miles. Therefore step-up Transformers are used to connect them to the local grid on 132 kV or the supergrid on 275 or 400 kV (in the UK)
What is 9.54 kilo ohms converted to ohms?
When we see the prefix kilo, it means times one thousand, or x 1000. If we have 9.54 kilohms, we have 9.54 x 1000 ohms = 9,540 ohms.
What is separately excited DC motor?
The main difference between the Separately excited motor and the shunt motor is the field cct where as in the second it has its own voltage supply.
Answer
I think you mean 'generator', not 'motor'. A 'self-excited' motor is one in which the output supplies the field current, as well as the load current. A 'separately-excited' motor is one in which the field current is provided from an external source.
Principle of operation of a double wound transformer?
they are to convert power into jeremy osborne, which in turn creates an aneesh karan
What types of current transformer?
Current transformer are used for measuring current in a bus bar without disconnecting it by means of ammeter.There are three types
1.bar type current transformer
2.toroidal current transformer
3.wound type current transformer
