## How to convert ohms to amps

How to convert resistance in ohms (Ω) to electric current in amps (A).

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

## Ohms to amps calculation with volts

The current

Iin amps (A) is equal to the voltageVin volts (V), divided by the resistanceRin ohms (Ω):

I_{(A)}=V_{(V)}/R_{(Ω)}So

amp = volt / ohm

or

A = V / Ω

## Example

What is the current of an electrical circuit that has voltage supply of 12 volts and resistance of 40 ohms?

The current I is equal to 12 volts divided by 40 ohms:

I= 12V / 40Ω = 0.3A## Ohms to amps calculation with watts

The current

Iin amps (A) is equal to the square root of the powerPin watts (W), divided by the resistanceRin ohms (Ω):_______________

I_{(A)}=√P_{(W)}/R_{(Ω)}So

_______________

amp =

√watt / ohmor

__________

A =

√W / Ω## Example

What is the current of an electrical circuit that has power consumption of 30W and resistance of 120Ω?

The current I is equal to the square root of 30 watts divided by 120 ohms:

________________

I=√30W / 120Ω = 0.5A

## See also