NCCR Electrical Practice Test

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The potential across the circuit is 480 volts and the current is 50 amps. What is the resistance?

9.6 ohms

Ohm's law shows how resistance connects voltage and current: R = V / I. With 480 volts and 50 amperes, the resistance is 480 ÷ 50 = 9.6 ohms. The other numbers would come from different currents, so they don’t match the given current. The resistance is 9.6 ohms.

4.8 ohms

19 ohms

96 ohms

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