Question

The resistance of a conductor is reduced to half its initial value. In doing so the heating effects in the conductor will become

• A. half
• B. double
• C. one-fourth
• D. four times

Answer 1

Answer: (A)

half

Heat produced in the resistor:

$H=I^{2}Rt$$⟹H\propto R$

$\therefore$ $R^{\prime }=\frac{R}{2}$$⟹$ $H^{\prime }=\frac{H}{2}$