If circuit has 20 amps and 240 volts, resistance is?

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Get ready for the NCCER Introduction to Electrical Circuits exam. Study with multiple choice questions, each question comes with hints and explanations. Ace your exam with confidence!

Multiple Choice

If circuit has 20 amps and 240 volts, resistance is?

Explanation:
Ohm's law: resistance is the voltage divided by the current. With 240 volts and 20 amperes, R = 240 / 20 = 12 ohms. This matches the given values exactly. The other options would require different voltages or currents (for example, 240 ohms would imply 4,800 V at 20 A, 0.12 ohms would give only 2.4 V at 20 A, and 2,400 ohms would need 48,000 V), so 12 ohms is the correct result.

Ohm's law: resistance is the voltage divided by the current. With 240 volts and 20 amperes, R = 240 / 20 = 12 ohms. This matches the given values exactly. The other options would require different voltages or currents (for example, 240 ohms would imply 4,800 V at 20 A, 0.12 ohms would give only 2.4 V at 20 A, and 2,400 ohms would need 48,000 V), so 12 ohms is the correct result.

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