An energy-efficient lightbulb, taking in 23.0 W of power, can produce the same l

Question

An energy-efficient lightbulb, taking in 23.0 W of power, can produce the same level of brightness as a conventional lightbulb operating at power 100 W. The lifetime of the energy-efficient bulb is 10 000 h and its purchase price is $4.80, whereas the conventional bulb has lifetime 750 h and costs $0.48 per bulb. Determine the total savings obtained by using one energy-efficient bulb over its lifetime as opposed to using conventional bulbs over the same time period. Assume an energy cost of $0.20 per kilowatt-hour.

$

Explanation / Answer

total hours 10,000.


Cost of bulb

for 23w = $4.8

For conventional bulb =

No of bulbs

= 10,000/750 = 13.33

cost= 13.33 x 0.48 = $6.3984

Now lets calculate the Running Cost

23W x 10,000 x 0.2/1000 = $46
100W x 10,000 x 0.2 /1000 = $200

total saving

= 6.39 + 200-(4.8+46)

=$155.6

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