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

So The current I in amps (A) is equal to the voltage V in volts (V), divided by the resistance R in ohms (Ω).

I(A) = V(V) / R(Ω)

So

amp = volt / ohm

or

A = V / Ω

Example 1

What is the current of an electrical circuit that has voltage supply of 120 volts and resistance of 40 ohms?

The current I is equal to 120 volts divided by 40 ohms:

I = 120V / 40Ω = 3A

Example 2

What is the current of an electrical circuit that has voltage supply of 190 volts and resistance of 40 ohms?

The current I is equal to 190 volts divided by 40 ohms:

I = 190V / 40Ω = 4.75A

Example 3

What is the current of an electrical circuit that has voltage supply of 220 volts and resistance of 40 ohms?

The current I is equal to 220 volts divided by 40 ohms:

I = 220V / 40Ω = 5A

Ohms to amps calculation with watts

So The current I in amps (A) is equal to the square root of the power P in watts (W), divided by the resistance R in ohms (Ω).

                   _______________

I(A) = √P(W) / R(Ω)

So

                     _______________

amp = √ watt / ohm

or

               __________

A = √ W / Ω

Example 1

What is the current of an electrical circuit that has power consumption of 40W and resistance of 40Ω?

The current I is equal to the square root of 40 watts divided by 40 ohms:

             ________________

I = √ 40W / 40Ω = 1A

Example 2

What is the current of an electrical circuit that has power consumption of 50W and resistance of 40Ω?

The current I is equal to the square root of 50 watts divided by 40 ohms:

             ________________

I = √ 50W / 40Ω = 1.11803399A

 

Amps to ohms calculation ►

 

See also

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