nerdexam
BICSI

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.

Bonding, Grounding and Electrical Protection

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)
  • A
    9% (3)
  • B
    11% (4)
  • C
    77% (27)
  • D
    3% (1)

Why each option

Peak power is calculated using P = V x I; with 120 volts and 12 amps, the result is 1440 watts.

A1018

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.

B1200

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.

C1440Correct

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.

D2037

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/

Topics

#peak power#Ohm's law#voltage#power calculation

Community Discussion

No community discussion yet for this question.

Full RCDD Practice