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A simple circuit consists of an ideal battery connected to a resistance R. If a second resistor is then connected in parallel with R, which statement is correct?

1. the current delivered by the battery will increase
2. the potential difference across R will decrease
3. the current through R will decrease
4. the power dissipated by R will increase

Correct answer: the current delivered by the battery will increase

Solution

Because the battery is ideal, the voltage across R is unchanged, so R's current and power are unchanged; the parallel resistor draws extra current, increasing the total current from the battery.

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