Question

Heat produced in a wire of resistance $R$ due to current flowing at constant potential difference is proportional to

• A. $\frac{1}{R^2}$
• B. $\frac{1}{R}$
• C. $R$
• D. $R^2$

Answer 1

The correct option is B $\frac{1}{R}$

According to Joule's heating effect, heat produced $H=\frac{V^{2}t}{R}$

$⟹$ $H\propto \frac{1}{R}$ for constant $V$