Find the applied voltage when the current is 30 A and the resistance is 4 Ω.

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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

Find the applied voltage when the current is 30 A and the resistance is 4 Ω.

Explanation:
Voltage is found by multiplying current by resistance, which is Ohm’s law. With 30 amperes flowing through 4 ohms, the voltage is V = I × R = 30 × 4 = 120 volts. So the applied voltage is 120 volts. If you imagine different scenarios to see why the other numbers don’t fit: a voltage of 60 V would occur with 30 A and 2 Ω, 240 V would need 8 Ω, and 12 V would need only 0.4 Ω. The given values point directly to 120 volts.

Voltage is found by multiplying current by resistance, which is Ohm’s law. With 30 amperes flowing through 4 ohms, the voltage is V = I × R = 30 × 4 = 120 volts. So the applied voltage is 120 volts. If you imagine different scenarios to see why the other numbers don’t fit: a voltage of 60 V would occur with 30 A and 2 Ω, 240 V would need 8 Ω, and 12 V would need only 0.4 Ω. The given values point directly to 120 volts.

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