Question

How can u convert an AC ( alternate current) into DC ( direct current ) generator ?

Answer 1

g. If you have a source of AC voltage and want to change it to a DC voltage to power something, then you use a rectifier circuit, as the other people said. If you want to convert DC to AC, you need an inverter or oscillator circuit. If you mean "How much DC voltage has the same effect as a certain amount of AC voltage?", then you would use the RMS (root-mean-square) value of the AC voltage. This is usually the way AC voltage is given, anyway. For example, the voltage from a wall socket (in the U.S.) is about 120 volts rms, which means that it has a peak value of 120*√2, or about 170 volts. It will heat up a resistor by the same amount as a DC voltage of 120 volts.

Answer 2

You can convert AC generator to DC generator
by rectifier or removing the parts of the generator.
By using a commutator.