PRESENTATION PRESENTATION ON RESISTORON RESISTOR

PRESENTED BY PRESENTED BY

SANGEET JAINSANGEET JAIN

&&

SOURABH JAINSOURABH JAIN

IT IS A DEVICE WHICH OFFERS RESISTANCE TO FLOW OF CURRENT IN ANY CIRCUIT.

SYMBOL OF RESISTOR-

TYPE OF RESISTORTYPE OF RESISTOR

FIXED RESISTORFIXED RESISTOR VARIABLE VARIABLE RESISTORRESISTOR

EX- AXIAL LEAD SURFACE MOUNT

EX-POTENTIOMETER

RESISTORRESISTOR

Fixed resistorsFixed resistors come in a come in a variety of different shapes, variety of different shapes, sizes and formssizes and forms

Axial lead resistors have Axial lead resistors have the value of resistance the value of resistance printed on them or as a printed on them or as a colour codecolour code

Surface mount resistors Surface mount resistors have a numerical code have a numerical code indicating a valueindicating a value

ResistorsResistors Variable resistorsVariable resistors

are called are called potentiometerspotentiometers

There is a fixed There is a fixed value of resistance value of resistance between two between two terminalsterminals

The moving part of The moving part of the potentiometer the potentiometer is called the wiperis called the wiper

Understanding Understanding thethe

Resistor Color Resistor Color CodeCode

THERE ARE TWO COLOUR CODE SYSTEM’S FOR CALCULATING THE VALUE OF A FIXED RESISTOR.

1). FOUR BAND RESISTOR COLOUR CODE

2). FIVE BAND RESISTOR COLOUR CODE

RESISTOR

ResistorsResistors Four band resistor Four band resistor

colour codecolour code 1st band provides the 1st band provides the

first significant figure first significant figure of the codeof the code

2nd band provides the 2nd band provides the second significant second significant figure of the codefigure of the code

3rd band is the 3rd band is the multipliermultiplier

4th band indicates the 4th band indicates the tolerance valuetolerance value

4-Band Resistors4-Band Resistors The resistor nominal value is encoded in the color code The resistor nominal value is encoded in the color code in in Powers of Ten NotationPowers of Ten Notation. The template for . The template for determining the nominal value and tolerance of a determining the nominal value and tolerance of a resistor with 4 color bands is given below:resistor with 4 color bands is given below:

1st Band = 1st Significant Digit

2nd Band = 2nd Significant Digit

3rd Band = Multiplier

4th Band = Tolerance

___ ___ 10 ____ %

5-Band Resistors5-Band Resistors For resistors with For resistors with 1% or 1% or 2% tolerance, the color 2% tolerance, the color

code consists of 5 bands.code consists of 5 bands.

1st Band = 1st Significant Digit

2nd Band = 2nd Significant Digit

3rd Band = 3rd Significant Digit

4th Band = Multiplier

5th Band = Tolerance

___ ___ ___ 10 ____ %

The template for 5-band resistors is:

How do we know which color How do we know which color corresponds to which number?corresponds to which number?

Using the Resistor Color Code Using the Resistor Color Code TableTable

ResistorsResistorsResistor colour code calculationResistor colour code calculation

The first band red has a value The first band red has a value of 2of 2

The second band purple has a The second band purple has a value of 7value of 7

The third band has a The third band has a multiplier of x 10multiplier of x 10

The last band indicates a The last band indicates a tolerance value of tolerance value of +/-5%+/-5%

Resistance value is 270Ω +/-Resistance value is 270Ω +/-5%5%

2

7

x10

+/-5%

Resistor Color CodeResistor Color Code

The power rating is The power rating is notnot indicated in the indicated in the resistor color code and must be resistor color code and must be determined by experience using the determined by experience using the physical size of the resistor as a guide. physical size of the resistor as a guide.

For resistors with For resistors with 5%5% or or 10%10% tolerance, tolerance, the color code consists of the color code consists of 44 color bands. color bands.

For resistors with For resistors with 1%1% or or 2%2% tolerance, tolerance, the color code consists of the color code consists of 55 bands. bands.

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