A device on a 220 V supply draws 0.5 A. What is its power?

Answer and explanation

Correct answer: A. 110 W

  1. Step 1: Power P = VI. Step 2. P = 220 × 0.5 = 110 W. Answer: 110 W. Why not the others: 440 W is what you get if you divide V by I. 220.5 W is what you get if you add the numbers. 55 W is what you get if you square the current.

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