Investigation into the electric resistance of different material
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... d also be proportional to the length of the wires.
Methods
The equipment needed consists of:
* A variable DC power pack
* Ordinary wires
* An ammeter
* A voltmeter
* 2 crocodile clips
* Assorted wires for tests
Then a circuit is set up in the same way as the illustrated diagram below.
* Connect the wire to the circuit by the crocodile clips
* Take the voltage and current readings from the meters
* Increase/decrease the supply from the power pack and take the readings again
* Repeat the experiment with different pieces of wire
Safety precautions
* Make sure that the circuit is properly connected before turning the power supply on, and do not ...
