Physics
WAEC 2009
A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 3.0\(\Omega\). A voltmeter connected across the cell registers 0.9V. Calculate the internal resistance of the cell
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A.
2.0\(\Omega\).
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B.
3.0\(\Omega\).
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C.
5.0\(\Omega\).
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D.
6.0\(\Omega\).
Correct Answer: Option A
Explanation
\(\frac{V}{R} = \frac{E}{R + r}\)
\(\frac{0.9}{3} = \frac{1.5}{3 + r}\)
r = 2\(\Omega\).
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