AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Joule's Law of Heating: The heat produced in a resistor is directly proportional to (i) the square of the current, (ii) the resistance, and (iii) the time for which current flows.
Mathematical Expression:
$$H = I^2 R t$$
Where:
Source: Chapter 11 – Electricity, Section 11.7 Heating Effect of Electric Current
---
Examiners expect three things here: the statement of the law (mentioning all three proportionalities), the formula, and symbol definitions. Missing any one costs marks. Note that the law is derived by applying Ohm's law ($V = IR$) to the energy equation $H = VIt$, giving $H = I^2Rt$. Write the symbols neatly in a list — examiners award a mark specifically for correct identification of each symbol.