Definisi dan Macam-Macam Resistor

RESISTOR

Definition:

A resistor is an electrical component that limit or regulated the flow of electrical current in a electronic circuit.

Electronic symbols:

 

Usage:

·         Reduce current flow.

·         Adjust signal levels.

·         To divide voltages.

·         Bias active elements.

·         And terminate transmission lines, among other uses.

Types of resistor:

1.      Fixed resistors

Fixed resistors are by far the most widely used type of resistor. They are used in electronics circuit to set the right conditions in a circuit. Fixed resistors have only one single value of resistance, for example 100Ω’s.

a.      Carbon Resistor

Carbon Resistors are the most common type of Composition Resistors. Carbon resistors are a cheap general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite (similar to pencil lead) and a non-conducting ceramic (clay) powder to bind it all together.

Carbon Resistor

The Carbon Composite Resistor is a low to medium type power resistor which has a low inductance making them ideal for high frequency applications but they can also suffer from noise and stability when hot.

b.      Film Resistor

    The generic term “Film Resistor” consist of Metal Film, Carbon Film and Metal Oxide Film resistor types, which are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, onto an insulating ceramic rod or substrate.

Film Resistor

Metal Film Resistors have much better temperature stability than their carbon equivalents, lower noise and are generally better for high frequency or radio frequency applications. Metal Oxide Resistors have better high surge current capability with a much higher temperature rating than the equivalent metal film resistors.

    

c.       Wirewound Resistor

Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrome) or similar wire onto an insulating ceramic former in the form of a spiral helix similar to the film resistor above.

 Wirewound Resistor

These types of resistor are generally only available in very low ohmic high precision values (from 0.01 to 100kΩ) due to the gauge of the wire and number of turns possible on the former making them ideal for use in measuring circuits and Whetstone bridge type applications.

2.      Variable resistors

These resistors consist of a fixed resistor element and a slider which taps onto the main resistor element. This gives three connections to the component, two connected to the fixed element, and the third is the slider. Variable resistors (potentiometers) can provide an infinite number of resistance values between zero and their maximum value.

The Resistor Colour Code Table

Colour	Digit	Multiplier	Tolerance
Black	0	1
Brown	1	10	± 1%
Red	2	100	± 2%
Orange	3	1,000
Yellow	4	10,000
Green	5	100,000	± 0.5%
Blue	6	1,000,000	± 0.25%
Violet	7	10,000,000	± 0.1%
Grey	8		± 0.05%
White	9
Gold		0.1	± 5%
Silver		0.01	± 10%
None			± 20%