#Resistor

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What is Resistor ?


Resistor is a passive two terminal component which resist the flow of current in the circuit. Passive component means that do not control current by means of another electrical signal. In other words there is no third person like base in the transistor to make them work or like IC that needs power supply to make it work.
Note: IC's and transistor are active components.

 Measurement of Resistor ?
Every resistor has its resistance value measured in ohm's. And it follows ohm's law.
Symbol of ohm (Resistance)
Types of resistor:

  • Fixed resistor (those resistor which resistance is fixed).
    Symbol of Fixed Resistor
    Fixed Resistor

  • Variable resistor (those resistor which resistance can be vary from one measurement to another)
Potentiometer or Variable Resistor
  • Varistor-Voltage Dependent Resistor (whose resistance changes with voltage).

Varistor or VDR
  • Thermistor a.k.a. Temperature Dependent Resistor (whose resistance changes either positive {PTC-Positive Temperature Coefficient} or to negative{NTC-Negative Temperature Coefficient} according to the temperature).
  
NTC(whose resistance decreases with increasing temperature and vice-versa fot PTC--Thermistor
  • LDR-Light Dependent Resistor (light controlled variable resistor.)
LDR

Variable Resistance is the property of sensors either it may change its resistance in the circuit by varying voltages, light, temperature and so on.

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