simple electric devices
TRANSCRIPT
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Simple Electrical
Devices
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1. Incandescent light
2. Switch
3. Circuit breaker
4. Flashlight
5. Power strip
6. Fuse
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Incandescent Light
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Light Bulb
Only about five parts. Name them.
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Light bulb
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Light under load
Current flow causes element to get hot and burn brightly.
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Switch
Typical wall switch.
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Switch On
Contacts are closed
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Switch Off
Contacts are open.
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SWITCH
How many parts?
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Circuit Breaker
Circuit breakers are Safety Devices.
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Circuit breaker
Notice the current rating.
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Circuit breaker inside
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Circuit Breaker Parts
1. On / Off Lever
2. Input terminal
3. Switch contact
4. Trip spring
5. Cocking arm
6. Bi-metallic strip
7. Output terminal
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On Off
Closed Open
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Tripped position
The cocking arm is not engaged with the bi-metallic strip.
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Flashlight
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Very simple circuit
All the required parts of a controllable circuit are
in the flashlight.
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Flashlight control
Slide contact with the light bulb reflector ring.
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Flashlight parts
Name the four parts of a controllable circuit in this
flashlight.
1. Voltage source 2. Conductive pathway
3. Load 4. Control
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Power Strip
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Power strip inside
Parts
1. Input cord
2. Circuit breaker
3. On / Off switch
4. Buss bars
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Power strip inside
Three Buss Bars
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The Fuse
Fuses are safety devices, like circuit breakers.
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Fuses have a filament designed to burn and break the
circuit if too much current flows through it.
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Do you see the filament? Fuses are also marked with the current
rating.
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Some fuses are rebuildable, but most are one-time usage.
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Automotive
Fuses
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Industrial Fuses
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Review
1. Name the parts of a light bulb.
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Parts of a circuit breaker
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Name the parts of a switch
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Parts of a power strip
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Parts of a flashlight