A cell can supply current of 0.4A and 0.2 through a 4.0ohms and 10.0ohms resistor...

A cell can supply current of 0.4A and 0.2 through a 4.0ohms and 10.0ohms resistor respectively.the internal resistance of the cell is?

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Answers (1)

Dende
3 months ago
using the formular E=I(R+r)
in first case
E=0.4(4+r)
in second case
E=0.2(10+r)
equating both
0.2(10+r)=0.4(4+r)
10+r=8+2r
=>r=2Ω...internal resistance is two ohms
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