0
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 induction and conduction?
Induction means "induced current." An inductor (like a coil) drives the current from it's own magnetic fields when a voltage source is applied to either end of the coil. Another way current is induced is when a current in one wire creates a magnetic field which can "induce" current in another wire that is parallel to the first wire.
Conduction just means that a material has electrical properties that allow current to flow such as copper or other conductive metals. Usually denoted in math as a lower case Greek symbol sigma.
CommentCurrents are not induced. Voltages are induced.
What is the definition of the consumer circuit in electrical installation?
Consumer circuit is a circuit that fixed between distribution line and consumer load control and protection unit is attached in order to prevent overload, leakage and short circuit.
What happens to the total impedance of a series RC ciRCuit as the frequency is increased?
when the frequency is increased the total impedance of a series RC circuit is decrease.
Which is better a AC or DC motor for an EV?
I'd like to know the arguments in favor of AC & DC motors to be used in EV's Art Sestak asestak@roadrunner.com
Cubic displacement inches (the volume in inches displaced by the piston/s).
How many effectively unique keys does the playfair cipher have?
Hi, I would say it is more than 120
It is. If my reasoning is correct, there are 360,000 unique ciphers. My reasoning is this: when i/j is counted as one letter and repetition is not allowed (as in Playfair), there are 25*24 = 600 possible digrams. Since each digram corresponds to one of those unique digrams, there are 600^2 = 360,000 unique Playfair ciphers (one should probably actually use 359,999 because one of the "ciphers" maps each digram to itself).
What are the advantages of Norton's theorem?
It is used to reduce the complexitiy of the network
AnswerNorton's Theorem is one of several theorems necessary to solve 'complex' circuits -i.e. circuits that are not series, parallel, or series parallel.
When does a vacuum draw the most amperage Free flow or When the tube is plugged?
In the case of a vacuum, the highest load, and thus the highest current, is when the nozzle is free flowing. Lowest current draw is when the nozzle is plugged. If you plug the nozzle with your hand, you will actually hear the motor speed up. This is because it is doing less work (that is, moving air). The vacuum is free spinning (not moving air) when the nozzle is plugged. Check the links section, for a link to a data sheet for an Ametek-Lamb vacuum motor. Notice in the performance curves where the current is maximum (17.4A) when the orifice is 2.0 inches (free flow), and the current is minimum (12.6A) when the orifice is 0.0 inches (nozzle plugged). Also notice how the RPM increases dramatically as the orifice (intake) is plugged. This is opposite of what common sense tells you it should be, but that's the way it is!
Why synchronous motor is not self starting?
As per the operating principle of the Synchronous motor, due to continuous & rapid rotation of stator poles,the rotor is subjected to a torque which is rapidly reversing i.e. in quick succession,the rotor is subjected to torque which tends to move it first in one direction & then in the opposite direction.Owing to its large inertia,the rotor cannot instataneously respond to such quickly-reversing torque,with the result that it remains stationary or in other words it is not self starting.
A thick peice of copper or alluminum that conducts electricricity within a switch board.
How do you measure inductance of a coil?
Type your answer here... By use an inductance meter or an inductance bridge
In most cases what is the maximum safe current value?
On average, it is around 11mA. Although every case varies.
What are steps to develop waterfall model for railway reservation system?
What are the steps for waterfall model for Railway reservation system
What is a major advantage of having a compensated transmission line?
The advantage of having a series compensated line is that it corrects for undervoltages created when a line is overloaded and acts as an inductive element. To compensate for this a series capacitor is added to produce the extra Vars being absorbed by the overloaded line. This will create a smoother voltage profile across the transmission line.
The basic function of a transformer is to change?
The basic function of a transformer is to change voltage levels.
What is the difference between 43 and 53 grades of cement?
The OPC was classified into three grades, namely 33 grade, 43 grade and53 grade depending upon the strength of the cement at 28 days when tested as per IS 4031-1988. If the 28 days strength is not less than 33N/mm2, it is called 33 grade cement, if thestrength is not less than 43N/mm2, it is called 43 grade cement, and if the strength is not lessthen 53 N/mm2, it is called 53 grade cement.
v of what? v across what? v measured from what 2 points? v across the coils? v across the resistor? v across the coils and resistor? v across the battery? v across the battery and coils? v across the battery and resistor? or are you asking what v stands for? v stands for voltage.
Define the ampere in terms of charge flow rate?
Although an ampere corresponds to a coulomb per second, this is not the way in which it is defined. Instead, it is defined in terms of the force between two, parallel, conductors, as follows:
The ampere is defined as 'the constant current that, if maintained in two straight parallel conductors of infinite length and negligible cross-sectional area and placed one metre apart in a vacuum, would produce between them a force equal to 2 × 10-7 newtons per unit length'.
The importance of this definition is the fact that it provides a connection between mechanical and electrical units of measurement.
The reason that an ampere cannot be defined in terms of a coulomb is that the ampere is a Base Unit, whereas a coulomb is a Derived Unit which, itself, is defined in terms of an ampere and a second.
One description for mcc is motor control center. It is an electrical panel or cubicle which houses the one electrical incoming feeder several outgoing power feeders.
In a half wave rectifier voltage across load resistance is not consistent, because for positive pulse of input voltage diode work as a forward bias i,e half wave rectifier treat as closed circuit and for negative pulse of a input voltage diode work as a reverse bias so no current flow through circuit. therefore voltage output is not consistent. In full wave rectifier two diodes are used at the both side of secondary coil of transformer. due to that for positive pulse of input voltage one diode diode work as a forward bias another as a reverse bias. for negative pulse of a input voltage second diode work as a forward bias another as a reverse bias,so consistent voltage can be provided by full wave rectifier.the nature of output voltage of half wave rectifier and full wave rectifier is that it flows through with only one polarity either in positive or negative in the circuit.
Causes of over temperature of induction motor?
the main reason is the amount of current flowing in the motor's winding is huge (over current) that why temperature begins to build up, continues using may end up to a burned motor. over voltage, defective bearing / bushing, shaft misalignment, defective insulation are some of the reason why motor experience over current.
What is surge impedance in power systems?
Actually surge impedance is present in a transmission line due to the capacitance of transmission line. Now this capacitor attends the reactive power of the transmission line to energise its magnetic flux. now due to the flux the impedance will increase and the power is reactive too. due to the impedance loss is more.
