filament lamp:

cost-80p
efficiency-0.2
expected life- 1000 hours

compact fluorescent lamp (CFL):
cost- £3.00
efficiency-0.8
expected life- 8000 hours

A filament lamp with a power rating of 100 w gives 2000 units of light. what power rating would a CFL need to provide 2000 units of light?

1) 8000 W
2) 20 W
3) 25 W
4) 25 kW

1 answer

P = 0.2/0.8 * 100W. = 25 W.

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