Physics
JAMB 1981
A cell of e.m.f 2V and internal resistance 1\(\Omega\) supplies a current of 0.5 amps to a resistance whose value is
-
A.
0.5\(\Omega\)
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B.
1\(\Omega\)
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C.
2\(\Omega\)
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D.
2.5\(\Omega\)
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E.
3\(\Omega\)
Correct Answer: Option E
Explanation
1 = \(\frac{E}{R + r}\)
\(\frac{2}{R + 1}\) = 0.5
0.5R = 2 - 0.5 = 1.5
R = \(\frac{1.5}{0.5}\)
= 3\(\Omega\)
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