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4 marksPower, P

CSEC Physics · May/June 2014 · Paper 2 · Question 5(b)(iii)

Rasheed is going on a two-week vacation and leaves a 60W incandescent light bulb on for security.

During the two-week period, 15.5 kWh of energy was lost as heat from the bulb. Determine the efficiency of the bulb.

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Other parts of this question

  1. 5(a)Describe THREE ways in which this can be done. State clearly what form of energy is conserved in EACH case.[6 marks]
  2. 5(b)(i)Calculate the total energy in kW h that the bulb will consume during the two-week period.[4 marks]
  3. 5(b)(ii)Given that Rasheed's electricity rate is $0.26 per kWh, calculate his electricity charges for the bulb for the two weeks.[1 mark]

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