Physics
JAMB 1985
An electric kettle, connected to a 240V mains, produces 6.0 x 10
5J of heat energy to boil a quantity of water in 5 minutes. Find the resistance of the kettle.
-
A.
14.4\(\Omega\)
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B.
28.8\(\Omega\)
-
C.
144\(\Omega\)
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D.
288\(\Omega\)
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E.
2880\(\Omega\)
Correct Answer: Option B
Explanation
Heat energy = Electrical energy
6 x 105 = \(\frac{V^2}{R}\)t
R = \(\frac{240 \times 240 \times 5 \times 60}{6 \times 105}\)
= 28.8\(\Omega\)
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