Question

A compact fluorescent lamp (CFL) uses less energy than its equivalent incandescent bulb. How much will a person save if he/she uses a 20 W CFL instead of a 100 W incandescent lamp for 6 h in 30 days? Electricity is priced at P 8.17/kW.h.

Answer 1

Answer:

The Environmental Protection Agency says that if every household replaced just one incandescent bulb with an "Energy Star"-rated LED or CFL (compact fluorescent), Americans would save close to $700 million per year in energy costs.

Explanation:

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Answer 2

Answer:

Savings= 117.7 Pesos

Explanation:

Given:

cost = Php8.17/kW.h

$P_{CFL}$ = 20w = 0.02kw

$P_{IL}$ = 100w = 0.1kw

T = 6hrs/30days = 180hrs

Savings = ?

Solution:

Formula - EC=PT

$EC_{CFL} = (0.02kW)(180hrs) = 3.6kW.hr$

$(EC_{CFL} )(cost) = (3.6kW.hr)(Php8.17/kW.h) = [Php29.4]$

$EC_{IL} = (0.1kW)(180hrs) = 18kW.hr$

$(EC_{IL})(cost) = (18kW.hr)(Php8.17/kW.h) = [Php147.1]$

Final Answer:

$EC_{IL} - EC_{CFL} = Php147-Php29.4 = [Php117.7]$

A person will save Php117.7 if he/she uses a 20W compact fluorescent lamp instead of a 100W Incandescent lamp for 6hr in 30days.

Extra information:

Terms and symbols::

P = power

T = time

EC = Electrical Energy Consumption