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a 60-watt light bulb uses 60 watt hours of electricity in 1 hour. Suppose everyone in the United States lef one unneeded 60 watt light bulb on for one hour everyday for a year.

Electricity is billed in kilowatt hours. So 60 watt hours is equal to sixty divided by one thousand. Express the electricity used by a 60 watt light bulb in one hour in kilowatt hours in scientific notation.

Respuesta :

Answer:

[tex]2.19 \times 10^{1}[/tex] kilowatt-hours.

Step-by-step explanation:

If a 60-watt light bulb is used every day for one year, then this will consume (365 × 60) = 21900 watt-hours of electricity.

{Because one complete year consists of 365 days}

This 21900 watt-hour is equivalent to [tex]\frac{21900}{1000} = 21.9[/tex] kilowatt-hours.

Therefore, in scientific notation the electricity consumed by each bulb in kilowatt-hour is [tex]2.19 \times 10^{1}[/tex]. (Answer)

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