April 13, 2018

Lesson Overview: Students will learn to read utility meters and compute energy use. After learning to read gas and electric meters, students will then proceed to monitor the energy used in their homes and keep a daily record. At school the information will be compiled and discussed.

TEKS:
Math: 3.1 (A), 3.3 (A, B), 3.14 (A, C), 3.15 (A), 3.16 (A, B), 4.1 (A, B), 4.3 (A), 4.4 (D), 4.14 (A), 4.15 (B), 5.3 (A, B), 5.12 (A), 5.14 (A), 5.15 (A), 6.11 (A), 6.12 (A), 7.11 (A), 7.13 (A), 8.1 (B), 8.2 (A, B), 8.14 (A), 8.15 (A)

Science: 3.1 (A), 3.2 (A, B, C, D, E), 3.16 (A, B), 4.1 (A), 4.2 (A, B, C, D, E), 4.3 (C), 5.1 (A), 5.2 (A, B, C, D, E), 5.3 (C), 6.1 (A), 6.2 (A, B, C, D, E), 6.3 (C), 6.4 (A), 7.1 (A), 7.2 (A, B, C, D, E), 7.3 (C), 7.4 (A), 8.1 (A), 8.2 (A, B, C, D, E), 8.3 (C), 8.4 (A)

Time: 45 minutes for first lesson; 10 minutes per day over one week or more.

Materials: One home Home Meter Reading worksheet per student, one Sample Meter Reading Worksheet per group, Teacher Meter Sheet on an overhead.

Vocabulary: kilowatts, meter, dials

## Background Information:

To read your meter first identify if you have an analog or digital meter. An analog meter will have multiple faces on it, similar to a clock or watch face, while a digital meter will flash numbers, similar to how a phone shows time. Regardless of the type of meter you have, meter reading can be kind of tricky.

### How to Read an Analog Meter:

• Stand directly in front of your meter. Looking at dials from an angle can distort the reading.
• If the dial hand is between numbers, use the smaller of the two numbers.
• If the dial hand is positioned exactly on number, look at the dial to the right to determine correct reading. Has the dial to the right recently passed zero?
• If no, use the smaller number on the dial you’re reading.
• If yes, use the number the hand is pointing to on the dial you’re reading.

Note: Some meters are marked with a x10 or similar number. This number is called a constant, and the meter readings should be multiplied by the number shown. If your meter has a constant, it will show on the meter in the lower left.

### How to Read a Digital Meter:

Your meter cycles through many numbers and letters when operating. Every display starts with a display identification number. Here is what those numbers mean (your meter may not display every item):

• Your meter will cycle through displays of different modes.
• At the beginning of each cycle, your meter will display all 8, referred to as the LED segment check.
• Your total energy use displays as kWh (Kilowatt-Hours)

LED Segment Check

Display Identification: Kilowatt-Hours

Note: Some meters are marked with a x10 or similar number. This number is called a constant, and the meter readings should be multiplied by the number shown. If your meter has a constant, it will show on the meter in the lower left.

### Setting the Stage:

Show the students a sample energy bill and how to read it. Ask them how a clock’s hands move. Ask if anyone knows where the meters are at their home or if they have ever seen meters in public.

### Activity 1: Sample Meters

Give each student a sample meter reading sheet and place the teacher meter sheet on the overhead. Teach the class how to read their meters, reviewing the rules from the background section with them. Draw pointers on your meters (or on a sheet placed over the overhead so you can erase and change them). Assign groups of four to practice “round robin” style with one student doing a problem and the rest checking and comparing with him or her. The next student does the next problem and so on.

### Activity 2: Personal Meters–School and Home

Remember that electric devices can be dangerous if they are tampered with, so make sure an adult supervises this activity.

Explain to the students how they will be checking their electricity meters at home daily for the next week. They will compute a total for kilowatt-hours of electricity if possible (some students may have only one). If possible, show the students the school’s meters and have each student read one dial.

Each day in class take a few minutes to discuss any problems or questions the students have. At the end of the week, subtract the beginning numbers from the last numbers to find the amount of energy used in that student’s home.

### Discussion:

1. Does your family spend more money on gas or electricity?
2. Can you think of five ways to use less gas and electricity?
3. Where do your gas and electricity come from?
4. How much gas and electricity would the families in the whole class use in a week? A year?
5. How much gas and electricity would the families of the whole school use?

### Extensions:

1. Do a spelling bee activity with meter reading: set up a few dials on the board and change the arrows for each player.
2. Chart or graph a year’s worth of your own energy bills and present them to your class. Discuss with the students the possible reasons for the fluctuations.