A charge passing through a resistor is varying with time as shown in the figure. The amount of heat generated in time 't' is best represented (as a function of time) by
Correct answer: C. Heat generated increases proportionally with time
- A. Heat generated is constant over time
- B. Heat generated decreases linearly with time
- C. Heat generated increases proportionally with time
- D. Heat generated decreases exponentially with time
Explanation
This option is correct. The heat generated in a resistor is given by the equation Q = I²RT, where I is the current, R is the resistance, and T is the time. If the current varies, the heat generated would be a function of the square of the current, making it proportional over time.
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Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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