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If the maximum voltage across a 100ohms resistor is 20V, then the maximum power it...

Physics
JAMB 1995
If the maximum voltage across a 100ohms resistor is 20V, then the maximum power it can dissipate is
  • A. 5.00W
  • B. 4.00W
  • C. 2.00W
  • D. 25W
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Correct Answer: Option B
Explanation
P = \(\frac{V^2}{R}\)

= \(\frac{20 \times 20}{100}\)

= 4W
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