A hair dryer has a resistance of 11 point 5 cap omega at 120 cap v What is the approximate power rating of the hair dryer?

Use the power formula for a resistor: P = V²/R. Substituting 120 V and 11.5 Ω gives P = 120²/11.5 = 14,400/11.5 ≈ 1,252 W. Rounded to the nearest listed value, the hair dryer’s power rating is 1,250 W, choice A.

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