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evablogger [386]
3 years ago
9

An 11.0-W energy-efficient fluorescent lightbulb is designed to produce the same illumination as a conventional 40.0-W incandesc

ent lightbulb. Assuming a cost of $0.111/kWh for energy from the electric company, how much money does the user of the energy-efficient bulb save during 220 h of use?
Physics
1 answer:
mario62 [17]3 years ago
5 0

Answer:

Savings = $0.709

Explanation:

Energy consumed by 11 W energy efficient fluorescent bulb is given as

E = Power \times time

now we can say

E = 11 \times 220h

E = 2.42 kWh

now total cost of the energy used is given as

Amount = 2.42 \times $0.111

Amount = $0.268

Now for conventional 40 W bulb  we can say

E = Power \times time

now we can say

E = 40.0 \times 220h

E = 8.8 kWh

now total cost of the energy used is given as

Amount = 8.8 \times $0.111

Amount = $0.977

So total money saving is given as

Savings = $0.977 - $0.268

Savings = $0.709

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