| Subject: Electricity |
Grade: Vocational Ed |
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1. Topic-
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2. Content-
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| The students will learn the most common method to wiring a typical
doorbell chime. |
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3. Goals: Aims/Outcomes-
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1. Students will have sufficient understanding of basic electrical
concepts for the purpose of this lab.
2. Students will become familiar with components of the lab.(chime,
transformer, button)
3. Students will comprehend doorbell wiring methods and be able to
follow wiring diagram instructions for the proper function of a chime. |
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4. Objectives-
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1. Upon completion of this lesson students will be able to properly
wire a doorbell chime
2. Advanced students may be able to understand sufficiently to wire
a doorbell chime with front and back doorbell buttons. |
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5. Materials and Aids-
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One 16"h x 24"w piece of 1/2" thick plywood per lab.
Wire strippers and screwdrivers for each lab board. Safety Glasses
for each student to be worn at all times during lab.
One hardware store doorbell chime kit;
One 12 volt address number light.
One six foot or longer 125v three prong cord.
Three small wire nuts.
One 4" x 1 1/4" octagonal box with blank cover and 1/2" knockout for
transformer.
One roll of doorbell wire. Assorted wood screws for mounting hardware
to plywood. |
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6. Procedures/Methods-
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A. Introduction-
1. Introduce basic principles of electrical safety. !Never work
on a live circuit!
2. Learn the difference of AC and DC
3. Describe what a transformer does and how it helps deliver power
to make modern day life in our homes comfortable.
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B. Development-
| The teacher will describe in detail the function of the doorbell
components. First the transformer, then the chime, and lastly how
the button works. |
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C. Practice-
1. Demonstrate to the students how to use the screwdriver to mount
hardware to plywood base (if not already mounted).
2. Show the students how to use wire strippers to cut and strip ends
of wire.
3. Explain the doorbell wiring diagram included in each kit.
4. Show the students how to use the screwdrivers to properly terminate
wire ends at the components.
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D. Independent Practice-
1. Assign students to lab buddies. Pair more advanced with less
advanced to help each other. Groups of three is not recommended as
the third person usually becomes inactive. Any odd one out gets their
own board.
2. Students will use the screwdriver to mount hardware to plywood
base.
3. Students will use wire strippers to cut and strip ends of wire.
4. Following the wiring diagram, students will use the screwdrivers
to terminate wire ends at appropriate components. |
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E. Accommodations (Differentiated Instruction)-
1. Shop smart and find doorbell kits that include instructions in
multiple languages; Spanish, French, Etc.
2. Place students with hearing disabilities in the front of the class.
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F. Checking for understanding-
1. Teacher can circle the group and answer questions to scaffold
the learning and foresee any incorrect wiring.
2. Students must submit lab for inspection by teacher before plugging
in.
2.Once plugged in does it work?
3. Working Labs will sound a triumphant "Ding-Dong"
4. Improperly wired labs will not work but will not short. Sometimes
a slight hum will be barely detectable. !Unplug to rewire!
5. Teacher will verify safe practices be observed at all times during
lab including wearing safety glasses.
6. Time permitting students who finish early may explore two button
lab with front and back doorbell buttons. |
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G. Closure-
1. Students will pack up doorbell kits and leave the lab better
than they found it.
2. By the end of the lab, the whole class should be full of "Ding-Dongs". |
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