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Two equal resistors connected in series across a battery dissipate a total power of 60 W. If the same two resistors are instead connected in parallel across the same battery, the total power dissipated will be:

1. 60 W
2. 240 W
3. 30 W
4. 120 W

Correct answer: 240 W

Solution

The parallel arrangement has an equivalent resistance four times smaller than the series one, so for the same battery voltage it draws four times the power: 4 * 60 = 240 W.

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