   Chapter 17, Problem 46P

Chapter
Section
Textbook Problem

The cost of electricity varies widely throughout the United States; $0.120/kWh is a typical value. At this unit price, calculate the cost of (a) leaving a 40.0-W porch light on for 2 weeks while you are on vacation, (b) making a piece of dark toast in 3.00 min with a 970-W toaster, and (c) drying a load of clothes in 40.0 min in a 5 200-W dryer. (a) To determine The cost of leaving the porch light. Explanation Given Info: The cost of electricity in United States is$0.120 per kilowatt hour. The power of torch light is 40.0W leaved for 2 weeks.

Explanation:

Formula to calculate the total energy spent is,

E=PΔt

• E is the total energy spent,
• P is the power of torch,
• Δt is the leaving time.,

Substitute 40.0W for P and 2 weeks for Δt in the above equation to find E

E=(40.0W)(1kWh103W)(2weeks)(336hour1week)=13

(b)

To determine
The cost of making dark toast.

(c)

To determine
The cost of drying clothes

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