Passive component with a known resistance.
The value of resistance is usually shown by a set of coloured bands on the body of the component.
The resistor shown above is coded Orange, Green, Blue with a silver tolerance band.
Using the following table the resistance may be calculated from the first three bands, Orange = 3, Green = 5 and the multiplier is Blue = 106 = 1000000.
The silver band indicates a tolerance of ±10%
Therefore, the resistance is
- There are a number of different types of resistors designed for different applications.
- Carbon Film
- A carbon film deposited on a small ceramic cylinder.
- Metal Film
- A thin film or metal particle mixture is used to control the resistance.
- Wire Wound
- A length of resistance wire wound onto a tube. These are very accurate and able to carry large currents.
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See also: Completion Resistor, Electrical Resistance, Fixed Resistor, Light Dependent Resistor, Photocell, Resistance, Shunt Resistor, Swamping Resistor, Tapped Resistor, Thermistor, Variable Resistor.