What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 kobo per kWh?

Assessment: JAMB UTME - Physics - 1984 Subject: Physics

Question 1 Report

What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 kobo per kWh?
Answer Details
PT = (5 x 50) + (100 x 4)

= 650watts

Energy(kWhr) = 650 x 10-3 x 10

= 6.5 kWhr

1kWhr cost 2 kobo ; 6.5 kWhr will cost  2 × 6.5 1

= 13 kobo

Read lesson note on Heat Transfer (JAMB)
Read lesson note on Electrical Energy And Power (JAMB)
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