1. Switches
Electronics 1
CVHS

2. Basic Elements of a Circuit
Three Essential Elements
Load
Complete Path
Power Source
Additional Elements
Control Device
Protective Device

3. Electricity Generation
Six Methods Used to Produce Electricity
Chemical
Magnetism
Heat
Friction
Light
Pressure

4. Basic Switch Function To open and close a circuit Open (no connection)
Closed (connection)
Control device
Does not consume power

5. Schematic Terms Pole- what the switch armature is connected to
• Throw- the closed position of
the switch
Pole
Throw

6. Single Pole, Single Throw
SPST
1 pole, 1 throw
Example- room lights

7. SPST Animation

8. Single Pole, Double Throw
SPDT
1 pole
2 throws, 2 closed positions

9. SPDT Animation

10. Double Pole, Single Throw
DPST
2 poles

11. Double Pole, Single Throw
Not 2 throws because of mechanical connection
Both armatures make contact at same time- one closed position

12. DPST

13. DPST Animation

14. Double Pole, Double Throw
DPDT
2 poles
2 separate closed positions

15. DPDT Animation

16. Switch Styles
Toggle
Slide

17. Switch Styles
Rocker
Push On/Off

18. Other Switches Momentary contact switches Push button switches
Rotary switches

19. Momentary Contact
Push Button Normally Open
PBNO
Red in color

20. PBNO

21. Momentary Contact
Push Button Normally Closed
PBNC
Black in color

22. PBNC

23. Rotary Switches
Used for complex circuits
Can have multiple throws

24. Rotary Switch
Example- Stereo input selector

25. #1) ?P?T

26. #2) ?P?T

27. #3) ?P?T

28. #4) ?P?T

29. #1) 3P1T

30. #2) 2P5T

31. #3) 3P2T

32. #4) 3P3T

33. Review What are the three basic parts of a circuit?
What else can a circuit include?
What are the six sources of energy?
What is the main function of a switch?
What is the difference between a throw and a pole?
What other types of switches are available?