Question

in a certain city, electricity costs $0.10 per kw⋅h. what is the annual cost for electricity to power a lamppost for 7.00 h per day with a 100. w incandescent light bulb versus an energy efficient 25 w fluorescent bulb that produces the same amount of light? assume 1 year

Answer 1

The annual cost for electricity to power a lamppost for 7.00 h per day with a 100 W incandescent light bulb versus an energy efficient 25 W fluorescent bulb is $25.55 and $6.3875 respectively.

The Power is the amount of Energy produced per unit time.

The general formula for the annual cost can be written as:

$Cost = P\cdot t\cdot d$

where. P is power, t is time in hours per day, and d is the total days.

Using the formula:

The cost of a 100 W incandescent light bulb:

$Cost=(0.1)(7)(365)(0.10)=\ 25.5$

Similarly,

The cost of a 25 W fluorescent light bulb:

$Cost=(0.025)(7)(365)(0.10)=\ 6.3875$

Hence, the annual cost is $25.55 and $6.3875 respectively.

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