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Resistor

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Owais Warraich
Owais Warraich

This document discusses different types of resistors and how they are used in circuits. It describes what resistors are, how their values are represented, and how they can be connected in series and parallel. There are two main types of resistors - fixed resistors and variable resistors. Resistors can also be classified by their material, with carbon film and metal film being most common. The document provides details on carbon film and metal film resistors. It also explains how variable resistors are used and how resistor values and tolerances are determined based on color bands.

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Resistor
Group Members:- Mohammad Owais Raees (BCS143066) Mahnoor Rana (BCS143076)
 Definition of resistors  Resistors in series  Resistors in parallel  Types of resistors
 The resistor is a component in a circuit to reduce the flow of electric current.  Its symbol is in a circuit diagram.  Resistance values is called Ohm. It is shown Ω .
R1 R2 R3
R1 R2 R3 = + +
There are two types of resistors;  Fixed Resistor  Variable Resistor They are also classified according to the material from which they are made.  Carbon film or metal film.  Wire wound  Foil resistor  Grid resistor Carbon or metal film resistors are the most common.
Carbon Film:-  This is the most general purpose, cheap resistor.  Carbon film resistors have a disadvantage; they can tend to be electrically noisy.
Metal Film:-  Metal film resistors are used when a higher tolerance is needed. The metal film resistor is used for bridge circuits, filter circuits, and low- noise analog signal circuits.
There are two general ways in which variable resistors are used.  Value is easily changed, like the volume adjustment of radio.  Semi-fixed resistor that is not meant to be adjusted by anyone but a technician.
Color Value Multiplier Tolerance (%) Black 0 0 - Brown 1 1 ±1 Red 2 2 ±2 Orange 3 3 ±0.05 Yellow 4 4 - Green 5 5 ±0.5 Blue 6 6 ±0.25 Violet 7 7 ±0.1 Gray 8 8 - White 9 9 - Gold - -1 ±5 Silver - -2 ±10
Example: Red, Black, Orange, Green (Red=2),(Black=0),(Orange=3) 20 x 103 = 20k ohm Tolerance(Green) = ±0.5%
Example: Yellow, Blue, Black, Red, Brown (Yellow=4),(Blue=6),(Black=0), (Red=2) 460 x 102 = 46k ohm Tolerance(Brown) = ±1%
Resistor

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Resistor

  • 2. Group Members:- Mohammad Owais Raees (BCS143066) Mahnoor Rana (BCS143076)
  • 3.  Definition of resistors  Resistors in series  Resistors in parallel  Types of resistors
  • 4.  The resistor is a component in a circuit to reduce the flow of electric current.  Its symbol is in a circuit diagram.  Resistance values is called Ohm. It is shown Ω .
  • 7. There are two types of resistors;  Fixed Resistor  Variable Resistor They are also classified according to the material from which they are made.  Carbon film or metal film.  Wire wound  Foil resistor  Grid resistor Carbon or metal film resistors are the most common.
  • 8. Carbon Film:-  This is the most general purpose, cheap resistor.  Carbon film resistors have a disadvantage; they can tend to be electrically noisy.
  • 9. Metal Film:-  Metal film resistors are used when a higher tolerance is needed. The metal film resistor is used for bridge circuits, filter circuits, and low- noise analog signal circuits.
  • 10. There are two general ways in which variable resistors are used.  Value is easily changed, like the volume adjustment of radio.  Semi-fixed resistor that is not meant to be adjusted by anyone but a technician.
  • 11. Color Value Multiplier Tolerance (%) Black 0 0 - Brown 1 1 ±1 Red 2 2 ±2 Orange 3 3 ±0.05 Yellow 4 4 - Green 5 5 ±0.5 Blue 6 6 ±0.25 Violet 7 7 ±0.1 Gray 8 8 - White 9 9 - Gold - -1 ±5 Silver - -2 ±10
  • 12. Example: Red, Black, Orange, Green (Red=2),(Black=0),(Orange=3) 20 x 103 = 20k ohm Tolerance(Green) = ±0.5%
  • 13. Example: Yellow, Blue, Black, Red, Brown (Yellow=4),(Blue=6),(Black=0), (Red=2) 460 x 102 = 46k ohm Tolerance(Brown) = ±1%