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Switches

Switches. Electronics 1 CVHS. Basic Elements of a Circuit. Three Essential Elements Load Complete Path Power Source Additional Elements Control Device Protective Device. Electricity Generation. Six Methods Used to Produce Electricity Chemical Magnetism Heat Friction

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Switches

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  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 Slide Toggle

  17. Switch Styles Push On/Off Rocker

  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?

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