Which of the following apparatus will require the smallest fuse rating for its protection?

Physics JAMB 1992

Which of the following apparatus will require the smallest fuse rating for its protection?

  • 60W, 240V checkmark
  • 60W, 40V
  • 40W, 12V
  • 40W, 5V

The correct answer is: A

Explanation

I = \(\frac{P}{V}\) = \(\frac{60}{240}\) = 0.25A

I = \(\frac{P}{V}\) = \(\frac{60}{40}\) = 1.5A

I = \(\frac{P}{V}\) = \(\frac{40}{12}\) = 3.3A

I = \(\frac{P}{V}\) = \(\frac{40}{5}\) = 8A
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