RESISTOR

for some resistor the value of can stay constant but in others it can change as the current changes

• the current through a ohmic conductor ( at a constant temperature ) is directly proportional to the potential difference .

  resistance remains constant as the current changes

  

  RESISTANCE FOR COMPONENTS LIKE LAMPS , DIODES , THERMISTORES AND LDRS IN NOT CONSTANT . IT CHANGES WITH THE CURRENT THROUGH THE COMPONENT

• the resistance of a filament lamp increases as the temperature of the filament lamp increases

  

the current through a diode flows in one direction only . the diode has a very high resistance in the reverse direction

1. the resistance of thermistor decrease as the temperature increase

   applications of thermistors

   Temperature Measurement: Thermistors are commonly used to measure temperature in various electronic devices and systems.

   Thermostats are one of the most common applications of thermistors in circuits. A thermostat is a device that maintains a set temperature by controlling a heating or cooling system

2. the resistance of an LDR increase when the light intensity increases

   Automatic Light Control: LDRs are widely used in automatic lighting systems, such as streetlights, outdoor security lights, and indoor lighting system