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20 September, 16:11

The current through a certain heater wire is found to be fairly independent of its temperature. If the current through the heater wire is doubled, the amount of energy delivered by the heater in a given time interval will (a) increase by a factor of two. (b) decrease by a factor of two. (c) increase by a factor of four. (d) decrease by a factor of four. (e) increase by a factor of eight.

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  1. 20 September, 17:23
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    (c) increase by a factor of four

    Explanation:

    energy = power x time, and power = resistance x current ^2. 2^2 = 4.
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