Question

Consider a 2.75 W electric clock. What is the yearly cost, in dollars, of operating such aclock if the cost of electricity is $0.075 per kW⋅h?

Answer 1

The cost of operating a 2.75 W electric clock for a year, with an electricity cost of $0.075 per kWh, is $0.57.

Step-by-step explanation:

To find the cost of operating the electric clock for a year, we need to determine the total energy consumed in kilowatt-hours (kWh) and then multiply it by the cost per kWh.

Given that the power of the clock is 2.75 W, we can calculate the energy consumed in a day by multiplying the power by the number of hours in a day (24 hours).

Then, we can find the energy consumed in a year by multiplying the daily energy by 365 days. Finally, we multiply the yearly energy by the cost per kWh to obtain the annual cost.

The cost of operating the 2.75 W electric clock for a year, with an electricity cost of $0.075 per kWh, is $0.57.

Answer 2

1 year= 365 days

1 day = 24 hours

1 kw = 1000w

2.75 x 1/1000 = 0.00275 kw

0.00275 kw * 24 * 365 = 24.09 kw*h

Cost = $0.075 per kwh

Cost = 0.075 x 24.09 = $1.80