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Question

I have a battery of internal resistance 20mΩ. When discharging with a current of 1A, the potential difference across its terminals is 2V. What is its EMF?

A
1.80 volts
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B
1.98 volts
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C
2.020 volts
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D
2 volts
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Solution

The correct option is C 2.020 volts
The potential difference across a battery in discharging mode is given by V= -ir where is the EMF of the battery and r is its internal resistance. Here, V is given to be 2V, I = 1A and
r=20×103Ω
=V+ir=2+1×(20×103)=2.020volts


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