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.

ColorValue 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%