If it is AC voltages you need to convert, you need to find a transformer to do this job. Without knowing the application it is hard to guess what you are trying to do.
5000 volts
+3.3 volts +5 volts, +12 volts -12 volts, and -5 volts but -5 is rare
Volts cannot be converted to amps. If you mean convert 220v to 12 volts output, then you need a 220v to 12 v step down transformer with the VA or watt rating you require.
To what?
You have your own answer. It is 1.5 amps.
If it is AC then you don't need a formula, you just need a transformer.
2 volts, 5 volts, 12 volts. New computers need even less voltage.
12 volts with the engine off. 13.5 to 15-5 volts with the engine idling.
Change the trailer light bulbs to 24 volts and supply a 24 volt source to power them, in that order.
12 volts
No Let's look at the current. The current can be calculated in two easy ways using these known data: Volts/Ohms and Watts/Volts Now 12/18 isn't the same as 5/12, so there's something wrong here.
Amps and volts are two different units of measure in electricity. Amps measure electrical current flow, while volts measure electrical potential difference. To convert amps to volts, you need to know the resistance of the circuit. Without that information, you cannot directly convert 12 amps to volts.