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esistor

esistor. A resistor is a device that limits, or resist curent. Variety of resistor. Precision wire-wound Power wire-wound Fuse resistor Carbon composition Carbon film Metal film Filament wound . Two main categories of resistor. Linear resistor- those which obeys OHM’S LAW

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esistor

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  1. esistor

  2. A resistor is a device that limits, or resist curent

  3. Variety of resistor • Precision wire-wound • Power wire-wound • Fuse resistor • Carbon composition • Carbon film • Metal film • Filament wound

  4. Two main categories of resistor • Linear resistor- those which obeys OHM’S LAW • Non-linear resistor- consist of three types in common use • Light dependent resistor( LDR )- light sensitive • Thermistor- heat sensitive • Voltage dependent resistor

  5. Classification of resistor

  6. Carbon composition • Made either by hot or cold molding from mixture of carbon and clay binder • Low cost • Resistive value: 10 ohms – megaohms • Uses: commercial, military , and aerospace

  7. Carbon film resistor • Made from carbon graphite, mixed with powdered insulating materials • Power ratings in watts are available from 1/8 watt – 5 watts • Offers low resistance, using low power

  8. Three distinct types of carbon film resistor • Standard film resistor • Chip resistor • Network resistor

  9. Metal film resistor These are formed by means of vacuum decomposition, a process by which any of the number of different metal or metal oxide films are deposited on a suitable insulating madrel or core.

  10. Variable resistor • Enclose in metal case with a shaft extending outside the case for variable control • The amount of resistance varies from zero to the maximum controls or trimmers where controlled amount of current or voltage is needed

  11. Different types of variable resistor • Potentiometer with switch • Dual audio pots • Liner potentiometer • 10 turn panel mounted

  12. Resistor trouble • Open • Out of tolerance • Noise control (for potentiometer)

  13. Thank you!!!

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