Electrical Engineering

coulomb

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Coulomb (symbol C) is a derived unit for electrical charge in SI; the base units are:

1 C = A x s

So, the coulomb is the electrical charge transported by an ampere in one second.

The rotor in a DC motor rotates because the magnetic field in either the rotor or the stator is constantly changing. If it is a brush type DC motor, then the rotor field changes as the rotor moves to a new position on the commutator. If it is a brush-less type DC motor, then there is some circuitry associated with the stator that changes the stator field.

to protect or to calculate the operating conditions of an electrical system and to camand circuitbreaker to trip in any fault detection.relay is the one which detects the abnormal condition of the circuit and signals the circuit breaker to trip(open).....

Switching the field voltage to the coils forces the magnets to move.

Theoretically, human beings can sit safely on an individual overhead line conductor, providing no part of their body comes into contact with another conductor or the earth. In practise, of course, it's another story as it's highly improbable that anyone could approach a high-voltage line in the first place!

The clearance between 33-kV line (not 'phase'!) conductors depends on whether they are rigid (e.g. busbars) or can move (e.g. overhead lines); whether they are insulated or in air; etc.. So there are several 'clearance' distances. All are published on the internet -so you can do a search to find out for yourself.

1 wave per second

A 228 sq mm conductor equates to 450 MCM. A conductor of 450 MCM is not a standard AWG wire size. A standard 400 MCM will carry 380 amps. A standard 500 MCM will carry 430 amps. Difference between 400 and 500 MCM amperage's is 50 amps. Transposing between the two amperage's of 50 amps will be 380 + 25 = 405 or 430 - 25 = 405 amps. This is a very rough calculated answer for the question.

An ammeter measures current, an important variable in electronics.

The unit hertz means "cycles per second" and is a measure of the frequency of variation of anything which changes during a set period of time, including electric current and voltage. Saying that a generator of electricity runs at 50 hertz means that its current and voltage changes regularly at a rate of 50 times per second. Saying that a generator of electricity runs at 60 hertz means that its current and voltage changes regularly at a rate of 60 times per second. The Hertz value can be changed on the generator by increasing or decreasing the speed (RPM) of the prime mover. The generator has a feed back unit that monitors the frequency and automatically applies more power to the prime mover if the load increases and the generator RPM starts to slow down. The reverse happens if the load drops off and the generator starts to speed up, the power to the prime mover will be reduced. On a diesel generator it is the fuel flow that is increased and decreased to keep the frequency at a constant value. On a water turbine it is the water flow that is increased and decreased to keep the frequency at a constant value.

the formula is 1/RT = 1/R1 + 1/R2 +.... + 1/Rn

RT being total

R1 being resistance in first path

R2 being resistance in parallel path

A thick wire has its cross section area more than that of the thin one .Since the resistance of a material is inversely proportional to its resistance, resistance of thick wire is less compared to.[as cross section area increases the no electrons drifted increases].this applies only to OHMICdevices.

Typically yes because that is what makes sense. However, the subpanel could have the same size breaker as long as the panel were rated for that amperage and the wire sizes were appropriate.

Generac is a brand of generator, what they do will depend on the model you buy. Most models of Generac generators are set to switch on automatically in the case of the a black out but they also have commercial generators for use in business (particularly construction) and RV generators

A generator produces electrical energy by harnessing mechanical energy and using that to rotate coils in a magnetic field.

No.

If the motor runs backwards, swap any two phases to reverse the rotation, like this:

Old wiring:

phase A - brown wire - motor lead T1

phase B - yellow wire - motor lead T2

phase C - orange wire - motor lead T3

New wiring:

phase A - brown wire - motor lead T2

phase B - yellow wire - motor lead T1

phase C - orange wire - motor lead T3

Two methods, one uses a dial that is held in the center of the revolving shaft and is directly read off of the dial face. The second method uses a strobe light. The light is focused on the shaft and the dial on the strobe is turned until it looks like the shaft has come to a stand still. The RPM is read off of the meter face of the strobe light.

volts X amps

A generator uses the rotation of a coil of wire in a magnetic field to generate an electric current (also known as a dynamo), while a motor uses electricity flowing through a coil of wire placed at right angles to a magnetic field to produce rotation of the coil. Look up Fleming's left and right hand rules in a Physics textbook for further information.

That is called an electrical current.

the maximum short current that can be safely break by the circuit breaker.