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Question

The battery in the diagram is to be charged by the generator G. The generator has a terminal voltage of 120 Volts when the charging current is 10 Amperes. The battery has an emf of 100 Volts and an internal resistance of 1 Ohm. In order to charge the battery at 10 Amperes charging current, the resistance R should be set at :

124897_e70d4a3c606b4d339d3ff5b228312ab7.png

A
0.1 Ω
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B
0.5 Ω
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C
1.0 Ω
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D
5.0 Ω
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Solution

The correct option is C 1.0 Ω
The generator has a terminal voltage of 120 volts when the charging current is 10 amperes. Hence,
E = V + Ir = 120+ 10(1) = 130V
Hence, in circuit
R=EVI
R=13012010=1Ω

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