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A cell of emf 1 5V is connected in series with ... - JAMB Physics 2013 Question

A cell of emf 1.5V is connected in series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell

A
4.0Ω
B
3.0Ω
C
1.5Ω
D
1.0Ω
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Correct Option: A

r = (\frac{E}{I} - R)

r = (\frac{1.5}{0.3} - 1)

r = 4(\Omega)

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