Resistor
ResistorResistor is one kind of passive components in electronics which either consume electrical Energy or are not capable of increasing power of signal .
A resistor can be defined which resists or limit the flow of current through it. The ability of a resistor to oppose current is called Resistance.
The relationship between the voltage across the resistor and current flow in the accordance with Ohms Law is as follows....
V =IR
R=V/I
where I is the current through the conductor in units of amperes, V is the voltage measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms.
Different Types Of Resistor
Linear resistor If a given temperature ,the current flowing through a resistive element is directly proportional to the applied voltage , the resistor is called Linear Resistor. Other words Linear Resistor obeys Ohm's Law within its Temperature.Its resistance value do not change over the entire operating range.
Examples are Carbon and Metal Film Resistors which are also called Fixed Resistor.
Non Linear Resistor Apart From Linear resistors these are a small group of special purpose resistors which do not perfectly obeys ohm's law . Examples are Thermistor , LDR, VDR.
Fixed Resistor Resistors which possess Fixed Value of resistance are called Fixed resistors.
Major Specifications of Common Types of Fixed Resistors
|
Specification
|
CarbonCompostion |
CarbonFilm |
Metal Film |
Wire Wound |
|
Resistance |
2.7Ω to 22M Ω |
2.7Ω to 2M Ω |
10Ω to 100MΩ |
0.25Ω to 100KΩ |
|
Tolerance Range |
±5% to ±20% |
±5% to ±20% |
±5% to ±20% |
±5% to ±20% |
|
Power Rating |
1/8W 1/4W 1/2W 1W 2W |
1/6W 1/4W 1/2W 1W 2W |
1/4W 1/2W 1W 2W |
3.5W to 10W 10W to 60W 60W to 1000W
|
|
Breakdown Voltage |
500 |
500 |
500 |
500 |
|
Max. op. Voltage |
150 |
200 |
150 |
300 |
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