Resistors

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Resistors

E-SERIES

E24 series

24 values: ±5% tolerance

E12 series

12 values: ±10% tolerance

E6 series

six values: ±20% tolerance

E3 series

three values: 1, 2.2 and 4.7

Standard resistors values

Resistance

Types of resistance

DC Resistance

no frequency in DC circuits

magnitude of DC is constant

AC Resistance

overall resistance in AC circuits

Resistance = Impedance

R = Z

Resistance Formula 2

Power and Voltage

P=V*I

product of supply voltage and electric current.

Resistance Formula 1

Ohm’s Law

V = I * R

ratio of supply voltage and current.

resistance of conducting material

It depends on the temperature

depends on the nature of the material

inversely proportional to the cross-sectional area of the material

directly proportional to the length of the material

Unit

volt per ampere.

electrical component

measure of the opposition to current flow

Main topic

Colour code

specify the resistance value

tolerance

used to identify the values of resistors

Resistors in Parallel

1/Rtotal= 1/R1+1/R2+1\R3+.........+1/RN

resistors in series

Rtotal = R1 + R2 + R3 +……+Rn

unit of resistors

Ohm

two-terminal electrical component

device used in electrical circuits

step up or lower the voltage

Application

used in digital multi-meter

used for controlling temperature

used in modulators

Types

Magneto-resistors

Light Dependent Resistors

Varistors

Thermistors

Variable Resistors

Fixed Resistors