1. How much does it cost to operate a 75 W lamp continuously for 1 week if the power utility rate is 7/kWh?
Unit conversion:
cost=cost/time*time*power
=$.07/kWh*1week*7days/week*24hr/day*.075kw
fwaf
.882
To determine the cost of operating a 75 W lamp continuously for 1 week, you need to calculate the total energy consumption and then multiply it by the power utility rate.
First, let's calculate the energy consumption:
1. Convert the power rating of the lamp to kilowatts (kW) by dividing it by 1000:
75 W ÷ 1000 = 0.075 kW
2. Calculate the total energy consumed in kilowatt-hours (kWh) by multiplying the power rating by the time in hours:
0.075 kW × 168 hours (1 week consists of 7 days, and each day contains 24 hours) = 12.6 kWh
Now, let's calculate the cost:
To find the cost of energy consumption, multiply the total energy consumption (12.6 kWh) by the power utility rate ($0.07/kWh):
12.6 kWh × $0.07/kWh = $0.882
Therefore, it would cost approximately $0.882 to operate a 75 W lamp continuously for 1 week if the power utility rate is $0.07/kWh.