A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 3.0\(\Omega\)....

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

A. 2.0\(\Omega\).
B. 3.0\(\Omega\).
C. 5.0\(\Omega\).
D. 6.0\(\Omega\).

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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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A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 3.0\(\Omega\)....

Correct Answer: Option A

Explanation

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