The set of lettered choices below refers to multiple questions. Select the one lettered choice that best answers each question. A choice may be used once, more than once, or not at all in each set.
Which graph represents the total heat produced by a resistor carrying a steady current as a function of time from time ?
Select an Answer
The correct answer is a steadily increasing amount. The rate of heat dissipation by a resistor is equal to the power it expends. The power is related to the current and the resistance by the equation , so if the current is constant the power is constant. The total heat developed is then the power multiplied by the total time :
The graph is thus a steadily increasing function of time.