RCDD · Question #131
If you have a circuit with 120 volts, 12 amps, and 10 ohms, it has a peak power of ________ watts.
The correct answer is C. 1440. Peak power is calculated using P = V x I; with 120 volts and 12 amps, the result is 1440 watts.
Question
If you have a circuit with 120 volts, 12 amps, and 10 ohms, it has a peak power of ________ watts.
Options
- A1018
- B1200
- C1440
- D2037
How the community answered
(35 responses)- A9% (3)
- B11% (4)
- C77% (27)
- D3% (1)
Why each option
Peak power is calculated using P = V x I; with 120 volts and 12 amps, the result is 1440 watts.
1018 watts equals 1440 divided by the square root of 2, which would represent an incorrectly reduced value with no valid formula basis for the given circuit values.
1200 watts does not result from any standard power formula (P=VI, P=V2/R, or P=I2R) applied correctly to the given values of 120V, 12A, and 10 ohms.
Applying the power formula P = V x I, multiplying 120 volts by 12 amps gives 1440 watts. The 10-ohm resistance confirms circuit consistency via Ohm's Law (V = IR: 120 = 12 x 10), but power is calculated directly from the voltage and current values provided. This is the standard formula for electrical power applied to the given circuit values.
2037 watts equals 1440 multiplied by the square root of 2, which would incorrectly apply an AC peak conversion factor to already-consistent circuit values rather than using P=VI directly.
Concept tested: Electrical power calculation using P = V x I
Source: https://www.allaboutcircuits.com/textbook/direct-current/chpt-2/power-in-electric-circuits/
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