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JAMB Physics 1982 Question 10

Question 10

Electrical Energy and Power

An electric iron is rated at 1000 watts, 250 V. The corresponding maximum resistance and accompanying current is

  1. A.62.5 A 4.0 Ω
  2. B.16.0 A 62.5 Ω
  3. C.62.5 A 16.0 Ω
  4. D.4.0 A 62.5 Ω
  5. E.4.0 A 250 Ω.
Show the answer and explanation

Answer: D (4.0 A 62.5 Ω)

Explanation

I = P/V = 1000/250 = 4 A, and R = V/I = 250/4 = 62.5 Ω.