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A cell of e.m.f 2V and internal resistance 1\(\Omega\) supplies a current of 0.5 amps...

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\(\Omega\)
  • B. 1\(\Omega\)
  • C. 2\(\Omega\)
  • D. 2.5\(\Omega\)
  • E. 3\(\Omega\)
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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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