What is the resistance of a clock if it has a current of 0.30 A and runs on a 9.0-V battery?

Use Ohm’s law, R = V ÷ I. With a voltage of 9.0 V and a current of 0.30 A, R = 9.0 ÷ 0.30 = 30 Ω, so the correct choice is 30.

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