# The Human Environment Energy

## CONTENTS OF CURRICULUM UNIT 81.05.01

- Narrative
- I. Understanding A Kilowatt-Hour.
- II. Learning How Electric Consumption Is Measured Learning How To Read A Meter.
- III, IV, V. Monitoring Electric Consumption In The Home. Identifying Electric Energy Users.
- VI . Understanding An Electric Bill And Calculating An Electric Bill.
- What Is A Kilowatt-Hour?
- Bibliography

### Unit Guide

## An Electrical Consumer’s Survival Plan

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## WHAT IS A KILOWATT-HOUR?

*indicates the amount of electricity that bulb will use in one hour*.

For example, a 100-watt bulb will use 100 watt-hours of electricity in 1 hour. Similarly, a 60-watt bulb will use 60 watt-hours of electricity in 1 hour. How many watt-hours of electricity will a 40-watt bulb use in one hour? _________ watt-hours

Will a 15-watt bulb use 30 watt-hours of electricity in 1 hour?__________

Since a 40-watt bulb will use ___ watt-hours of electricity in 1 hour, then the same bulb will use ___ watt-hours of electricity in 2 hours. How many watt-hours of electricity will a 40-watt bulb use in four hours? ___ To answer this question you must multiply the number ___by the number ___. You find that a 40-watt bulb will use 16 0 watt-hours of electricity in four hours.

Answer the following:

- 1. A 100-watt bulb will use 100 ______ of electricity in one hour.
- 2. Two 100-watt bulbs will use ________ of electricity in one hour.
- 3. How many watt-hours of electricity will three 60-watt bulbs use in 1 hour? In 3 hours?

1 hour_________ | 3 hours________ |

Because the average home will use several thousand watt-hours of electricity in one month, it is more convenient to measure the amount of electricity in a unit larger than the watt-hour. One kilowatt-hour is equal to 1000 watt-hours.

1 kwhr = 1000 watt-hours

REMEMBER that the kilowatt-hour is larger than the watt-hour.

Two kilowatt-hours equal ___ watt-hours.

500 watt-hours equal ___ of a kilowatt-hour.

How many watt-hours equal 5 kilowatt-hours? ___

*
If five 200-watt bulbs were used for one hour, they would use a total of 5 times 200 watt-hours or 1000 watt-hours or 1 kilowatt-hour
*
.

Answer the following:

1. If each fluorescent tube in the lighting fixtures in your classroom is labeled 40 watts, how many watt-hours of electricity is being used in 1 hour? How many kilowatt hours in 1 hour? - 2. How many kilowatt-hours are lights in this classroom are turned on for 8 hours?
- 3. In what other ways besides the overhead lighting is electricity used in the classroom?