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Ohm's Law Examples

These worked examples apply Ohm's Law (V = I × R) to find a missing quantity from two known values, the same calculation the Ohm's Law Calculator performs.

  1. Step 1

    A circuit has a current of 2 A flowing through a 60 Ω resistor. Find the voltage.

    V = I × R = 2 A × 60 Ω = 120 V

  2. Step 2

    A 120 V supply is connected across a 60 Ω resistor. Find the current.

    I = V ÷ R = 120 V ÷ 60 Ω = 2 A

  3. Step 3

    A load draws 2 A from a 120 V supply. Find the resistance.

    R = V ÷ I = 120 V ÷ 2 A = 60 Ω

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