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ASVAB · Circuits and Ohm's Law

What is the power consumed by a device drawing 5 amperes at 110 volts?

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Correct answer

550 W

  1. A 22 W
  2. B 55 W
  3. C 550 W
  4. D 605 W

Why this is the answer

Power = Voltage × Current = 110 × 5 = 550 watts. Electrical power in watts is P = V × I (voltage times current). The distractor 22 W divides 110 by 5, 55 W is 110 ÷ 2, and 605 W adds 55 to the right answer — a near-miss. Knowing P = VI also lets you go the other way: a 1,100-watt device on a 110 V supply draws 10 amperes, which is why high-power appliances need their own circuit.
Source: ASVAB EI, Power Calculation

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About this topic: Circuits and Ohm's Law

Circuits and Ohm's Law questions ask you to calculate voltage, current, resistance or power, and to understand series versus parallel circuits — how resistance adds in series and reduces in parallel, and what happens when one component fails. This is one of 17 Electronics Information questions on circuits and ohm's law, each with a full explanation on a single study page.

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