RESISTOR
E-BOOK
CREATED BY
TArit Chaaeiam
TARIT CHAAEIAM
16 DECEMBER 2022
TABLE OF CONTENT
1
DEFINITION
2
CONSTRUCTION
3
SYMBOL
4
PRINCIPLE
5
APPLICATION
CONSTRUCTION
A RESISTOR IS AN ELECTRICAL
COMPONENT THAT LIMITS OR
REGULATES THE FLOW OF ELECTRICAL
CURRENT IN AN ELECTRONIC CIRCUIT.
RESISTORS CAN ALSO BE USED TO
PROVIDE A SPECIFIC VOLTAGE FOR AN
ACTIVE DEVICE SUCH AS A TRANSISTOR.
2
SYMBOL
THESE SYMBOLS USE FOR CURCUIT DIAGRAM
3
PRINCIPLE
THE RESISTOR ABSORBS THE ELECTRICAL
ENERGY IN THE PROCESS WHERE IT ACTS AS
A HINDRANCE TO THE FLOW OF ELECTRICITY
BY REDUCING THE VOLTAGE, AND IT IS
DISSIPATED AS HEAT. IN TODAY'S WORLD OF
ELECTRONIC CIRCUITS, THE HEAT
DISSIPATION IS TYPICALLY A FRACTION OF A
WATT.
OHM'S LAW STATES THAT IF I IS THE
CURRENT FLOWING THROUGH THE RESISTOR
IN AMPERES, AND R IS THE RESISTANCE IN
OHMS, THEN V IS THE VOLTAGE DROP THAT
IS IMPOSED BY THE RESISTOR (IT IS THE
ELECTRICAL POTENTIAL DIFFERENCE
BETWEEN THE TWO CONTACTS THAT ARE
ATTACHED.).
V=I*R
4
APPLICATION
RESISTORS ARE USED IN THE FOLLOWING
WAYS:
IN SHUNT WITH AMPERE METRE
APPLICATIONS WHERE BALANCED
CURRENT REGULATION, HIGH
SENSITIVITY, AND PRECISE
MEASUREMENT ARE REQUIRED, WIRE-
WRAPPED RESISTORS ARE USED.
PHOTO RESISTORS ARE USED IN FLAME
DETECTORS, BURGLAR ALARMS, AND
PHOTOGRAPHIC DEVICES, AMONG OTHER
THINGS.
RESISTORS ARE USED TO CONTROL
TEMPERATURE AND VOLTMETER
READINGS.
DIGITAL MULTIMETERS, AMPLIFIERS,
TELECOMMUNICATIONS, AND
OSCILLATORS ALL EMPLOY RESISTORS.
MODULATORS, DEMODULATORS, AND
TRANSMITTERS ALL USE THEM.
5
thyaounk
TArit Chaaeiam