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JAMB Physics 1995 Question 45

Question 45

Electrical Energy and Power

If the maximum voltage across a 100-ohm resistor is 20 V, then the maximum power it can dissipate is

  1. A.5.00 W
  2. B.4.00 W
  3. C.2.00 W
  4. D.0.25 W
Show the answer and explanation

Answer: B (4.00 W)

Explanation

P = V2/R = 202/100 = 4.00 W.