Resistance :
The resistance of a conductor is the obstruction offered to the flow of electrons in a conductor. Resistance is temperature dependent:
Aim:
To show that the value of resistance of a conductor depends on temperature for constant voltage between the ends of the conductor.
Materials required :
1. A bulb 2. A battery 3. Key 4. Insulated wire 5. Multimeter
Procedure :
1. Take a bulb and measure the resistance when it is in open circuit using a multimeter.
2. Note the value of resistance in your notebook.
3. Connect a circuit with components as shown in figure.
4. Switch on the circuit. After few minutes, measure the resistance of the bulb again.
5. Note this value in your notebook.
Observation :
1. The value of resistance of the bulb in second instance is more than the resistance of the bulb in open circuit.
2. The bulb gets heated.
Result:
The increase in temperature of the filament in the bulb is responsible for increase in resistance of the bulb
