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

*I*_{(A)} = *V*_{(V)} /
*R*_{(Ω)}

So

Amps = Volts / Ohms

or

A = V / Ω

Find the current of an electrical circuit that has a voltage supply of 12 volts and a resistance of 40 ohms.

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

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

*I* = 12V / 40Ω = 0.3A

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

Amps = √[Watts / Ohms]

or

A = √[W / Ω]

Find the current of an electrical circuit that has a power consumption of 30W and a resistance of 120Ω.

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

*I* = √[30W / 120Ω] = 0.5A

Amps to Ohms ►

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