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Kieran Denny Oasis Academy Mayfield
Cand:8288
Theory
Resistance is when electricity is passed through a circuit and is measured for finding how easy the current goes through the circuit
It is measured the by finding the current that is present in the circuit and the voltage across the wire, then is placed in this formula: V= I/R
Perditions
My perditions are that the longer the wire the greater the resistance. This happens then the wire is longer there are more free elections to collide with other free elections. Therefore more energy will be lost as heat
Also ...
Theory
Resistance is when electricity is passed through a circuit and is measured for finding how easy the current goes through the circuit
It is measured the by finding the current that is present in the circuit and the voltage across the wire, then is placed in this formula: V= I/R
Perditions
My perditions are that the longer the wire the greater the resistance. This happens then the wire is longer there are more free elections to collide with other free elections. Therefore more energy will be lost as heat
Also when the length of the wire is doubled the resistance will also be doubled, is happens because is will double the collisions, then this will double the energy lost.
Method
1. One metre length of 0.4mm diameter of copper wire is fixed to a metre rule.
2. The first crocodile clip is clipped to the wire at the 0cm position on the metre rule.
3. The second crocodile clip is clipped at 1000 mm.
4. The power supply is turned on. The voltage and current are then read off the ammeter and voltmeter, and recorded.
5. The power supply is then turned off and the second crocodile clip is moved to the next position.
The above steps are completed for each length and then the entire investigation is repeated for accuracy.
Safety
With this experiment there was one hazard, the power pack has a high voltage so we kept it at 6V
Conclusion
There is a direct link between the length and the resistance. The longer the wire the higher the resistance.
Evaluation.
There is some variation between them so more readings for each one will increase the accuracy
Kieran Denny Oasis Academy Mayfield
Cand:8288