Concept explainers
When a battery with a significant internal resistance is part of a complete circuit, the voltage across its terminals is its (a) emf, (b) terminal voltage, (c) power output, (d) all of the preceding.
The voltage across the battery with internal resistance.
Answer to Problem 1MCQ
The voltage across the battery with internal resistance is
Explanation of Solution
Terminal voltage is expressed as,
Here,
Conclusion:
Voltage across the battery when it is not connected to a circuit is referred as emf. Therefore, option (a) is incorrect.
Power output doesn’t correspond to the voltage of the battery. Therefore, option (c) is incorrect.
When the battery has internal resistance, the total voltage across its terminals is equal to the terminal voltage given by equation (1). Therefore, option (b) is correct.
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