The terminal voltage of a battery is 4.0V when supplying ...
The terminal voltage of a battery is 4.0V when supplying a current of 2.0A, and 2.0V when supplying a current of 3.0A. The internal resistance of the battery is
0.5 Ω
1.0Ω
2.0Ω
4.0Ω
Correct answer is C
E = 4 + 2r and E = 2 + 3r
therefore, r = 2Ω
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