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A bulb marked 240V, 40W is used for 30 minutes. Calculate the heat generated

Physics
WAEC 2007
A bulb marked 240V, 40W is used for 30 minutes. Calculate the heat generated
  • A. 320J
  • B. 400J
  • C. 10800J
  • D. 72000J
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Correct Answer: Option D
Explanation
W = P x t

= 40 x 30 x 60

= 72000J
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