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.

Question

Quizplus · Accepted Answer

The energy delivered by the heater is proportional to the square of the current (Joule's Law). Therefore, if the current is doubled, the energy delivered will increase by a factor of four (2^2).

The Current Through a Certain Heater Wire Is Found to Be