# How to convert Ohms to Volts

## Ohms to Volts calculation with amps

In accordance with Ohm's Law, 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 volts are equal to amps times ohms:

Volts = Amps * Ohms

or

V = A * Ω

## Example

Find the voltage in volts given a resistance of 25 ohms and a current of 0.2 amps.

The voltage V is equal to 0.2 amps times 25 ohms which is equal to 5 volts:

V = 0.2A * 25Ω = 5V

## Ohms to Volts calculation with Watts

The power P is equal to the voltage V times the current I:

P = V * I

The current I is equal to the voltage V divided by the resistance R (ohm's law):

I = V / R

So the power P is equal to:

P = V * V / R = V2 / R

So the voltage V in volts (V) is equal to the square root of the power P in watts (W) times the resistance R in ohms (Ω):

V(V) = √[P(W) * R(Ω)]

So volts are equal to the square root of watts times ohms:

Volts = √[Watts * Ohms]

or

V = √[W * Ω]

## Example

Find the voltage V in volts given a resistance of 12.5Ω and a power of 2 watts.

The voltage V is equal to the square root of 2 watts times 12.5 ohms which is equal to 5 volts:

V = √[2W / 12.5Ω] = 5V  