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

*R*_{(Ω)} = *V*_{(V)} / *I*_{(A)}

So

Ohms = Volt / Amps

or

Ω = V / A

Find the resistance of an electrical circuit that has voltage supply of 12 volts and current flow of 0.3 amps.

The resistance R is equal to 12 volts divided by 0.3 amps:

*R* = 12V / 0.3A = 40Ω

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

*R*_{(Ω)} = *P*_{(W)} / *I*_{(A)}^{2}

So

Ohms = Watts / Amps^{2}

or

Ω = W / A^{2}

Find the resistance of an electrical circuit that has a power consumption of 30 watts and current flow of 0.5 amps.

The resistance *R* is equal to 30 wattts divided by the squared value of 0.5 amps:

*R* = 30W / 0.5A^{2} = 120Ω

Ohms to Amps ►

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