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Switches

Switches. 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 Light Pressure.

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Switches

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  1. Switches

  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. Terms To Know: • “SPST” – Single Pole / Single Throw • “SPDT” – Single Pole / Double Throw • Ganged Switch (MPMT) • Mercury Switch • Electromagnetic Switch • Position Switch • Pressure Switch

  6. Introduction: • Commonly used to control the “on/off function” of a component and/or circuit • Also used to “direct the current” in an electrical circuit • May also be used as “momentary contact” switches • The term “pole(s)” refers to the number of input circuits of the switch • The term “throw(s)” refers to the number of output circuits of the switch • Switches may be “normally open” (NO), or “normally closed” (NC) depending upon the application • May be used on either power or ground side of circuit

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

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

  9. SPST Animation

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

  11. SPDT Animation

  12. Double Pole, Single Throw • DPST • 2 poles

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

  14. DPST

  15. DPST Animation

  16. Double Pole, Double Throw • DPDT • 2 poles • 2 separate closed positions

  17. DPDT Animation

  18. Switch Styles Slide Toggle

  19. Switch Styles Push On/Off Rocker

  20. Mercury Switches • A SPST type switch • Uses mercury as the conductor for the contacts • Accurate mounting of mercury switches is essential to proper operation • Used on ground side of circuit

  21. Electrical Switches An Electromagnetic Switch in a Horn Circuit

  22. Other Switches • Momentary contact switches • Push button switches • Rotary switches

  23. Momentary Contact • Push Button Normally Open • PBNO • Red in color

  24. PBNO

  25. Momentary Contact • Push Button Normally Closed • PBNC • Black in color

  26. PBNC

  27. Rotary Switches • Used for complex circuits • Can have multiple throws

  28. Rotary Switch • Example- Stereo input selector

  29. Position Switches • May be used on power or ground side of circuit • Used to indicate whether a component is in the on or off position • Only provides a “high/low” signal to a solid state control device • A low current circuit

  30. Pressure Switches • Can be used on either power or ground side of circuit • Switch is turned on/off by “pressure” rather than a component’s movement • Switch may carry current load of circuit • Switch may be used as a type of position switch for a solid state control device

  31. Project by: • Akshit patel-13BEEEG107 • Himanshu vasava-13BEEEG096 • Bhavik patel-13BEEEG106 • Megh soni-13BEEEG113

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