Question

An external resistance R is connected to a battery of e.m.f. V and internal resistance r. The joule heat produced in resistor R is maximum when R is equal to

• A. r
• B. $\frac{r}{2}$
• C. 2r
• D. Infinitely large

Answer 1

Answer: (A)

r

Answer 2

For maximum joule heat produced in resistor external resistance = Internal resistance.