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A 40-W instrument has a resistance of 90\(\Omega\). On what voltage should it be operated...

Physics
JAMB 1993
A 40-W instrument has a resistance of 90\(\Omega\). On what voltage should it be operated normally?
  • A. 60V
  • B. 150V
  • C. 225V
  • D. 3600V
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Correct Answer: Option A
Explanation
P = \(\frac{V}{R}\)

V = \(\sqrt{PR}\)

V = \(\sqrt{40 \times 90}\)

= 60V
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