What are the two kinds of voltage?

There are two types of voltage:

1. AC

2. DC

It's hard to answer what 'Types' of voltage there are. It is measured in volts and can span anywhere from zero to almost infinity.

Useable voltages can be roughly zoned.

From zero up to 1 volt. = Signal voltage.

1.5v to 36v = Low voltage for electronics and consumer items.

48v to 240v = High voltage for domestic applications in the home.

280 to 512v = High voltage used for industrial machines.

1KV to 400Kv= Very high voltage for transmission over distance.

AC (Alternating current) is made using a spinning generator. It is the only type of current that can be transformed easily from one volktage to another using a transformer.

DC (Direct current) is normally made using batteries, but can also be made using a generator with a commutator and brush gear.

Very hard to change voltage, but useful at low voltages for electronics.