
Drag the ‘Resistor’ to the gap 2 and 3 of the Carey fosters bridge.

Drag ‘Fractional resistor' to gap 1.

Drag the Battery to space in between the two ‘Resistors’.

Drag the copper strip to gap 4.

Press the continue button, on the top.

Click and unmark the resistance which has to be introduced in ‘Resistor’.

Power On button to start and power off to stop the experiment.

Change the position of jockey to get balancing length l_{1}’.

Reverse connection button to interchange copper strip with fractional resistor.

Move jockey to get balancing length l_{2}’.

Resistance per cm of bridge wire is found using equation

Repeat the experiment for different values of Resistance.

Repeat steps 13.

Drag ‘Unknown resistance 1’ to gap 4 in bridge.

Introduce the resistance and move jockey to get balancing length l_{1}.

Reverse button to interchange unknown resistance 1 with Fractional resistor.

Move jockey to get balancing length l_{2}.

Unknown resistance value is found using the equation

Repeat the experiment for different temperature t_{1}, t_{2}….and note corresponding resistance X_{1}, X_{2}...

Temperature coefficient of resistance is found using equation

Repeat the experiment for unknown resistance 2.

A graph is plotted between values of X and t , which gives a straight line, whose slope is α.