A circuit has a current of 1.2 A. If the voltage decreases to one-third of its original amount while the resistance remains constant, what will be the resulting current?

By Ohm’s law, current equals voltage divided by resistance. Since the resistance stays constant, reducing the voltage to one-third also reduces the current to one-third: 1.2 A ÷ 3 = 0.4 A. The resulting current is 0.4 A, choice B.

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