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A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is...

Physics
JAMB 1988

A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is the cost of operating it in 20 days?

  • A. N4.80
  • B. N48.00
  • C. N480.00
  • D. N4800.00
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Correct Answer: Option A
Explanation

Energy(kWhr) = 200 x 10\(^{-3}\) x 20 x 24

= 96kwhr

1 kwhr cost 5 kobo; 96 kwhr will cost

5 x 96 = 480 kobo

= N4.80

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WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts