Answer the following questions related to heating in electric circuits:
PHYSICS · Multi-part · AP · Physics 2: Algebra-based · Electric Circuits · Electric Circuits
Problem
Answer the following questions related to heating in electric circuits:
(i) State Joule’s law of heating and write its mathematical expression.
(ii) Starting from the relation for electrical power, derive an expression for power in terms of current and resistance only.
(iii) For a fixed current through a resistor, explain how the heat produced depends on the resistance of the resistor.
(iv) For a fixed resistor, if the current through it becomes three times its initial value, by what factor will the heat produced in a given time change? Show your reasoning.