Introduction
An electric resistor is an electronic component which
provide electrical resistance in different electrical circuits. The resistors
are used to reduce the flow of electric current in electronic circuits and also used to
provide various signals to many electronic devices. But in electrical systems
resistors are used in motor controls to produce huge amount of resistance in the
way of current and also used in power distribution and for loads on generators
for testation. Fixed resistors have low resistances commonly but variable
resistors have huge amount of its resistance values. Resistors are used
commonly in both electrical and electronics devices.
Function
The electrical function of a resistor is based on its rating.
The electrical resistors are manufactured over a wide range of its magnitude.
The normal values of resistances fail in electrical systems due to their low
ratings.
Types
The following are the different types of resistors:
- Fixed Resistor
The following are the main types of fixed resistors:
- Carbon Pile
- Carbon Film
- Printed Carbon Resistor
- Thick and Thin Film Resistor
- Metal Film
- Metal Oxide Film
- Wire Wound
2. Variable Resistors
The following are the main types of variable resistors:
- Adjustable Resistors
- Potentio-meters
Formula
In electrical systems, the power consumed by a resistor can
be calculated by this formula.
The power consumed by a resistor is converted
into heat. Here V is the voltage across resistor and I is the current consumed
by a resistor.
Reaction of Resistor
Resistors are used to waste power in power supplies, Power
amplifiers etc. The average power that the resistor wastes is higher than its rating.
This is due to their reversible change due to its coefficient temperature, when
it warms. The wastage of huge amount of power may raise the temperature of the
resistor and thus resistors burn the whole circuit board.
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