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Basics of elec.
This document provides an overview of basic electronics components including resistors, capacitors, diodes, and transistors. Resistors are used to limit current or divide voltage. Capacitors store energy in the form of charge and are used in timing circuits. Diodes only allow current to flow in one direction and are used to rectify signals. Transistors have three terminals - emitter, base, and collector - and can be used to amplify or switch electronic signals. The document describes the purpose, types, and practical uses of each component.
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Basics of elec.
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- 2. We will bediscussing….. • Resistor • Capacitor • Diode • Transister
- 3. RESISTORS • Resistors areused 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. Contd… • Unit ofresistance is ohm. • Notation for resistance O- for ohm K- for kilo ohm M- for mega ohm
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- 7. Practical Use…. • Toreduce the current flowing in circuit, use resistance in parallel.
- 8. • To reducethe voltage for any circuit, use resistance in series.
- 9. CAPACITORS • A twoterminal 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.
- 10. Types of capacitors •Polarized which have specified positive and negative terminals. • Non-polarized no defined polarity for terminals.
- 11. Practical use • Usedfor 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.
- 12. DIODES • A two-terminalelectronic component that conducts electric current in only one direction.
- 13. The direction ofarrow shows the only possible direction of current.
- 14. Types of diodes •LED i.e Light Emitting Diodes These diodes emit light when provided with power supply.
- 15. • Photodiode These diode generates currents when exposed to light.
- 16. Practical use • Used for making gates • Used for making rectifiers • Used as a switch • LED as indicators • Photodiodes as light detector
- 17. TRANSISTOR • A transistoris 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.
- 18. Contd…. • The threeterminals are Emitter, Base and Collector
- 19. • Transistor areof two types: 1-> n-p-n A straight switch 2-> p-n-p A inverted switch
- 20. n-p-n as straightswitch • 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).
- 21. p-n-p as invertedswitch • 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).
- 22. Practically used… • Asa switch • As an amplifier • For realizing logic gates
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