the power rating of a clock is 10 w, and the cost of electrical energy is $0.15 per kilowatt - hour. rounded…

the power rating of a clock is 10 w, and the cost of electrical energy is $0.15 per kilowatt - hour. rounded to the nearest cent, how much does it cost to run the clock for one whole week? $0.04 $0.25 $1.68 $11.20

the power rating of a clock is 10 w, and the cost of electrical energy is $0.15 per kilowatt - hour. rounded to the nearest cent, how much does it cost to run the clock for one whole week? $0.04 $0.25 $1.68 $11.20

Answer

Explanation:

Step1: Convert power from watts to kilowatts

Since (1) kilowatt ( = 1000) watts, the power of the clock (P=10\space W=\frac{10}{1000}\space kW = 0.01\space kW)

Step2: Calculate the time in hours

One week has (t = 7\times24=168\space h)

Step3: Calculate the energy consumed

Using the formula (E = P\times t), we substitute (P = 0.01\space kW) and (t=168\space h). So (E=0.01\times168 = 1.68\space kWh)

Step4: Calculate the cost

The cost (C) is given by the formula (C=E\times) cost per kilowatt - hour. Given the cost per kilowatt - hour is ($0.15), then (C=1.68\times0.15=$0.252\approx$0.25) (rounded to the nearest cent)

Answer:

($0.25) (Option 2)