Question

Two identical batteries, each of e.m.f. 2 volt and internal resistance 1.0 ohm are available to produce heat in an external resistance $R = 0.5$ohm by passing a current through it. The maximum Joulean power that can be developed across R using these batteries is

• A. 1.28 watt
• B. 2.0 watt
• C. $\frac{8}{9}watt$
• D. 3.2 watt

Answer 1

Answer: (B)

2.0 watt

Answer 2

${P\left( \frac{E^{2}}{4r} \right)\left( \frac{2 \times 2}{4 \times 1} \right)}_{\max}$