Local 483 Apprenticeship Practice Exam

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If a circuit has a current of 2 A through a 3 Ω resistor, what is the voltage across that resistor?

3 V

6 V

Voltage across a resistor is found using Ohm's law: V = I × R. With a current of 2 A through a 3 Ω resistor, multiply 2 by 3 to get 6 volts. The units also line up, since A × Ω equals V. So the voltage across the resistor is 6 V. The other numbers would require a different current or resistance, so they don’t match these given values.

2 V

9 V

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