Electrical Engineering

this is the only way the motor will turn

in a 2 pole motor if you move the brushes 90 degrees one way the poles will attract each other

90 degrees the other way they repel and there would be some oscillation until it did the shift to the non repelling state

the brushes arent at the geometric null since when its running the null shifts a bit because of residual magnetism

the brush rings can be shifted a bit to get the dynamic null at normal load conditions, less arcing, less brush wear

A capacitor resists a change in voltage. Initially, a capacitor given a DC voltage will appear to have very low resistance, but as current flows and time goes by, the resistance will increase as the voltage approaches the applied voltage. At equilibrium, the voltage across the capacitor will be equal to the applied voltage, the current will be zero, and the resistance will be infinity.

Reactions that involve nuclei, called nuclear reactions, result in a tremendous amount of energy. Two types are fission and fusion.

By increasing the number, and depth of penetration, of earth electrodes. Chemical treatment of the soil in the vicinity of the earth electrodes can also be tried.

Using Ohms Law: V = I x R, where V (Voltage), I (Current), and R (Resistance). re-arranging: V/R = I Therefore if you double both the Voltage and the Resistance, the current remains unchanged.
Current = Voltage / Resistance. If both resistance and voltage double the current remains the same.

A silicon controlled rectifier falls into this category.

um.. a switch is a part of a series circuit because parallel circuits don't have switches

mu = output power / input power; where mu is the efficiency input power can be calculated from P = IV ; where P is power, I is current, and V is voltage. output power can be calculated from P = Fv ; where P is power, F is applied force, and v is the velocity.

rectifier diodes handle larger amounts of power. A switching diode handles much less amperage but at a quicker rate. There are switching diodes that can switch power on and off in several nano-seconds.

It depends on a lot of factors. Generally speaking, if the insulation is THHN then the rating is 350 amps. If the insulation is THWN then the rating is 310 amps. The ampere rating for wire depends on the temperature of the environment it will be used in, the insulation rating and the number of circuits installed in a conduit. There are also other factors to consider... like voltage drop in long runs.

The terminology would typically reference a device such as a power supply, charger, diverter or transformer. The Input Voltage is the voltage supplied to the device to make it work. The Output Voltage is what the device supplies to an application.

For example, a power supply for a laptop might convert 120 VAC to a voltage like 19.5 volts (A Sony Laptop) for charging a laptop battery.

Quebec , Canada uses hydro power because of it's many rivers.

It has static charges. Or it may be combustible, that's why it spark and went to flame.

An electric train uses electric motors.

Modern trains have many motors, they are mounted on the axles, one motor per axle. Some axles will be powered and have motors on them, some will not.

The quick way is to find a cable size table and look it up. The calculation is complicated so most people use tables of pre-calculated values.

It complicated because the current you can run through a cable depends on the cooling of the cable. Current passing through a cable with greater than zero resistance, which is normal, will generate heat in proportion to the square of the current and the resistance of the wire.

If you can keep the cable cool enough to stop it melting then it will carry that current. But cooling a cable depends on a lot of factors, especially the insulation on the cable. Electrical insulation, to keep the electricity inside the cable, also keeps heat inside the cable, so most power distribution cables run quite warm to the touch. They are limited by the softening and melting point of the plastic insulation that is commonly used.

Even overhead cables, insulated and cooled by air, run warm, but its not recommended to try and touch them.

In Canada the phase sequence colours are A = red, B = black and C = blue. As for CCW rotation on a three phase electrical power system I presume that you are talking about motor connections. There are meters that can be connected to the motor not connected to the system. You just spin the rotor in the direction that you want the motor to run when connected and the meter will tell you what the connection will be to the power system to obtain that direction. Be it ABC or CBA.

when you put your ac directly on your dick then it is proportional. not a ac voltage

The megger is used to find insulation resistance in any equipement. It will generate around 10kVA power to test.

Yes. Each light bulb is just another resistor in a series circuit, where you add the individual resistances to get the total resistance (unless the bulbs are set up in parallel, where adding a second identical light bulb would cut the total resistance in half).

Its is the condition when two different phases directly comes in contact with out any load or resistance.

how does the current flow in a three phase circuit when neutral is not connected?

A balanced three-phase 4-wire circuit - one with equal currents in all three live wires - has zero current flowing in the 4th wire, the neutral. Therefore the neutral wire can be removed, leaving just the three live wires.

Instantaneously, the sum of the three currents is always zero in a balanced three-phase circuit. As an example, when the current reaches its peak in one wire, say 10 amps, the current in the other two wires is one half, 5 amps, in the opposite direction. Therefore the two wires take the return current for the first wire. This state of affairs happens continuously at every instant in the AC cycle, so three lives wires are all that is needed.

The voltage is the same across parallel inductors for the same reason its the same across parallel anythings - resistors - capacitors - transformers - whatevers. Parallel means sharing common connections to another part of the circuit. That sharing involves conductors that have essentially zero impedance. (Zero for all practical considerations) In order for there to be a different voltage across those parallel components, the conductors connecting them together must have something other than zero impedance, and then we would not be talking about parallel anymore. (Ohm's Law: Voltage is Current times Resistance. If the resistance of the conductor is zero, then the voltage across the conductor must also be zero - it does not matter what the current is.)

No. A relay is an electric switch and a circuit breaker is an overcurrent device.