Basics of elec.


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Basics of elec.

  2. 2. • • • • We will be discussing….. Resistor Capacitor Diode Transister
  3. 3. RESISTORS • Resistors are used to limit current or divide voltage and in some cases, generate heat. • Used for driving circuit which requires low current and voltage than available. • A two terminal non-polarised component.
  4. 4. Contd… • Unit of resistance is ohm. • Notation for resistance O- for ohm K- for kilo ohm M- for mega ohm
  5. 5. Physical appearance
  6. 6. Practical Use…. • To reduce the current flowing in circuit, use resistance in parallel.
  7. 7. • To reduce the voltage for any circuit, use resistance in series.
  8. 8. CAPACITORS • A two terminal electronic component which stores energy in form of charge. • capacitance is a measure of a capacitor's ability to store charge. • A large capacitance means that more charge can be stored. • Capacitance is measured in Farads(F) but prefixes like µF and pF for smaller values.
  9. 9. Types of capacitors • Polarized which have specified positive and negative terminals. • Non-polarized no defined polarity for terminals.
  10. 10. Practical use • Used for making timer circuits, when used with resistance. • Used in clipper, clamper circuit. • Used for providing instantaneous large power as in flashlight of cameras. • Used in DC filter circuits.
  11. 11. DIODES • A two-terminal electronic component that conducts electric current in only one direction.
  12. 12. The direction of arrow shows the only possible direction of current.
  13. 13. Types of diodes • LED i.e Light Emitting Diodes These diodes emit light when provided with power supply.
  14. 14. • Photodiode These diode generates currents when exposed to light.
  15. 15. Practical use • • • • • Used for making gates Used for making rectifiers Used as a switch LED as indicators Photodiodes as light detector
  16. 16. TRANSISTOR • A transistor is a semiconductor device commonly used to amplify or switch electronic signals. • Device with three terminals where one terminal can be use to control the flow of current through the other two terminals.
  17. 17. Contd…. • The three terminals are Emitter, Base and Collector
  18. 18. • Transistor are of two types: 1-> n-p-n A straight switch 2-> p-n-p A inverted switch
  19. 19. n-p-n as straight switch • When base of n-p-n is connected with logic high voltage then it short circuit emitter and collector (SWITCH ON). • When base of n-p-n is connected with logic low voltage then it open circuit both emitter and collector (SWITCH OFF).
  20. 20. p-n-p as inverted switch • When base of p-n-p is connected with logic high voltage then it open circuit emitter and collector (SWITCH OFF). • When base of p-n-p is connected with logic low voltage then it short circuit both emitter and collector (SWITCH ON).
  21. 21. Practically used… • As a switch • As an amplifier • For realizing logic gates
  22. 22. Thank You