8.3.1: Exercises — Read — Invisible Network

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Exercise \(\PageIndex{1}\)

A typical showerhead uses 5 gal of water per minute. A water-saving showerhead uses approximately 2 gal of water per minute. How much water would one person save in a month if they take a 6-minute shower 4 times a week?

Exercise \(\PageIndex{2}\)

An average toilet uses 5 gal of water per flush. A high-efficiency toilet uses about 1.25 gal per flush. How much water would a household save in a week if the toilet was flushed 8 times a day?

Exercise \(\PageIndex{3}\)

When washing dishes, leaving the faucet running utilizes about 15 gal every 5 minutes, where filling the sink and turning the faucet off except to rinse the dishes uses about 5 gal for washing a dishpan-sized load of dishes. How much water is saved by not leaving the faucet running if it takes 10 minutes to wash a dishpan-sized load of dishes each day for a month containing 30 days?

Exercise \(\PageIndex{4}\)

Leaving the water running when washing your hands consumes about 4 gal of water, whereas turning the water off when lathering reduces the water used to 1 gal. How much water is saved in an apartment of 6 people in an academic term of 16 weeks if each person averages washing their hands 3 times a day?

Exercise \(\PageIndex{5}\)

How long would it take for an energy-saving light bulb to consume 1 kW of power if the bulb is rated at 7.5 W? Round your answer to the nearest hour.

Exercise \(\PageIndex{6}\)

How long would it take for a 120 W light bulb to consume 1 kW of power? Round your answer to the nearest hour.

Exercise \(\PageIndex{7}\)

A portable television uses about 80 W per hour. How many kilowatt-hours are needed to run the television during a 3-day trip if the television is run for an average of 5.5 hours a day?

Exercise \(\PageIndex{8}\)

A flat iron to straighten hair is rated at 331 W. If it is used for 15 minutes a day, 5 times a week, how much would it cost a user over the course of a month if the electric rate is 13 cents per kilowatt-hour? Round your answer to the nearest cent.

Exercise \(\PageIndex{9}\)

You purchase a window air conditioner for your apartment living room rated at 1,000 W. If you run the air conditioner for an average of 3 hours a day for a week, how much would it cost if the electric rate is 12 cents per kilowatt-hour?

Exercise \(\PageIndex{10}\)

A cabin uses approximately 25 kW of electricity per day. What size solar system would be needed to fuel 90% of the cabin’s needs for a month if the cabin is used 2 days a week?

8.3.1: Exercises is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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