A transformer for charging a power tool steps the line voltage down to 2.9 V. The output current of this transformer is 240 mA. If the transformer is 80% efficient, what is the input current?
A) 300 mA
B) 7.3 mA
C) 240 mA
D) 190 mA
E) 4.6 mA
Correct Answer:
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