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Physics Current Electricity Level: University

Heating effect of current

The current through a certain heater wire is found to be fairly independent of its temperrature. 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