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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 the meaning of the word armature?
In electrical engineering: an armature is the revolving part which carries a motor's rotor windings.
In the making of models from which industrial and artistic metal castings are to be made: the frame around which an original plaster model is built up.
CAN LDRs be connected in parallel?
yes the ldr can be connected in a paralell circuit as i have done a experiment about te ldrs
maderchod
Check for a blown fuse in one of the phase legs.
The reverse KVAR relay protects a generator from a loss of excitation. When the excitation system is lost, reactive power will flow from the system back into the generator. When this happens, induced currents at twice the system frequency will flow in the rotor windings and rotor structure.
You can imagine this senario as so: Let's say you have a tank of pressurized water connected to a hose that you are using to water the garden. What happens if you increase the pressure in the tank? You probably can guess that this makes more water come out of the hose. The same is true of an electrical system: Increasing the voltage will make more current flow. Hope that answers you question!
What is the working principle of cycloconverter?
Cycloconverter is a ac to low frequency ac converter.which convert ac to low freq.ac with help of scr.
"Memory Failure", as applied to NiCad batteries, is a myth. It was documented by NASA in some of their satellites, but occurred under very tightly controlled circumstances. It does not happen in the practical world. It is more probable that the charger and/or device are improperly designed, as NiCads are very touchy.
NiCad "failure" is probably simply old age. They do have a limited number of charge/discharge cycles, and they are extraordinarily sensitive to overcharge and overdischarge, i.e. reverse charge, so using a resistor to discharge a multi cell battery is not a good idea.
Best approach - buy a new battery.
What information is found on transformer nameplate?
The plate should as a minimum show the working voltage, volt-amp capability and the rpm of the generator. Other optional information is the manufacturer and serial number.
What is the difference between the current and electricity?
Current specifically refers to the movement electrons through an electric conductor. Electricity is a more general term.
Difference between overcurrent relay and fuse?
Current is flow of electricity charge. Voltage is a measure of potential energy or charge. Fuse. Is a device that opens when the current rating is exceeded this stopping the flow of current.
What is the effects of frequency on RC lag network?
In an RC lag network, the frequency of the input signal affects the phase shift and the output voltage. As the frequency increases, the reactance of the capacitor decreases, causing the output voltage to lag more significantly behind the input. At low frequencies, the capacitor has a higher reactance, resulting in less phase shift and a more significant output signal. Thus, higher frequencies lead to greater attenuation and phase lag in the output relative to the input.
Why should you never measure resistance in a circuit carrying a current?
Ideally true, but seldom so. The vast majority of resistance meters use current to measure resistance and just use V=IR to give R - the resistor is in a circuit carrying current. The only method that does not have a current through the resistance, it actually relies on the fact, is a Wheatstone bridge. The most important reason for not having a current is that you will be using a current in most cases, to meaure the resistance. Current from another source will screw the reading. Also, with a current flowing, you are not measuring resistance - you are measuring impedance - a combination of inductance and resistance.
Why will more voltage be induced with the apparatus if an iron core is inserted in the coils?
No one knows.
Is lightning a high-voltage electric current?
Yes, the clouds become electrically charged and when there is excessive charge there is a big spark.
The charge produces an electric field in the space under it, and when the field is high enough the gas atoms in the air break down, electrons are stripped off them and there is a plasma which conducts electricity. The charge in the cloud flows to join opposite charges on the ground. When charge flows there is an electric current.
What happens to the amount of current in a series circuit as the number of batteries increase?
it increases
What is the difference between field current and voltage?
Field Current in a DC Motor is the flow of electrons through the field circuit by a field controller. The flux of the motor, that with the armature current generates torque, is directly proportional to the field current.
Field Voltage is the electrical potential energy applied on the field circuit by a field controller.
Legacy Field Controllers controlled the field voltage. Using I=V/Z (Z=R+iX) the field current is then indirectly controlled. Due to the heat generated by E=i2 R t in the motor, the resistance R would decrease, increasing the field current and therefore changing the base speed of the motor and disturbing the control.
Newer field controllers control the field current eliminating this problem
