# How to convert amps to volts

How to convert electric current in amps (A) to voltage in volts (V).

You can calculate volts from amps and watts or ohms, but you can't convert amps to volts since volt and amp units represent different quantities.

### Amps to volts calculation with watts

The voltage *V* in volts (V) is equal to the power *P* in watts (W), divided
by the
current *I* in amps (A):

*V*_{(V)} = *P*_{(W)}* */* I*_{(A)}

So

volt = watt / amp

or

V = W / A

#### Example

What is the voltage supply of an electrical circuit that has power consumption of 45 watts and current flow of 3 amps?

The voltage V is equal to 45 watts divided by 3 amps:

*V* = 45W / 3A = 15V

### Amps to volts calculation with ohms

The voltage *V* in volts (V) is equal to the current *I* in
amps (A), times the
resistance *R* in ohms (Ω):

*V*_{(V)} = * I*_{(A)} ×
*R*_{(Ω)}

So

volt = amp × ohm

or

V = A × Ω

#### Example

What is the voltage supply of an electrical circuit that has current flow of 3 amps and resistance of 10 ohms?

According to ohm's law the voltage V is equal to 3 amps times 10 ohms:

*V* = 3A × 10Ω = 30V