1 / 31

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.

kemp
Download Presentation

Switches

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related