H2P-314
Internal resistance
H2 Physics · JC 2 · Medium · Internal resistance
A battery has an e.m.f. of 2.5 V. When a charge of 40 C passes through the battery, 30 J of energy is dissipated as heat in its internal resistance and 70 J is delivered to an external resistor. Assuming all electrical energy is converted to heat, what is the e.m.f. of the battery based on these data?
- 2.5 V
- 1.8 V
- 1.0 V
- 0.75 V
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