The aim of this experiment is to measure how the resistance change as the factors change

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Factors which effect the resistance of a wire

Planning

Aim:

The aim of this experiment is to measure how the resistance change as the factors change. There are so many variables—temperature of surroundings, length, thickness, material, temperature of the wire, surface area, magnetic properties, coated or not and purity—that can be chosen to measure in this experiment. But in this experiment I am only going to measure two of them, which are length and thickness because these two are the easiest to measure and show the effects on the resistance.

Prediction:

The result should be showing that the resistance increase as the length or thickness increase. This happens because when length or thickness increases, the current will decrease. As the voltage won’t change, if the current decreases, then the resistance will increase.

Method:

In the experiment I will need to use apparatus listed below.

  • Copper wires with different length
  • Copper wires with different thickness
  • Connection wires
  • Voltmeter
  • Ammeter
  • Electricity supply or battery
  • Variable resistor

Diagram:

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First, I will connect the electricity supply, variable resistor, voltmeter, ammeter and the first copper wire with connection wires. Then, I will switch on the electricity supply and keep the voltage steady by checking the reading on the voltmeter. Also, I will check the reading on the ammeter as well. After that I will record all the readings in a small table. Finally, I will repeat the experiment again and again until I have finished all the recordings on every wire (different length and thickness).

Obtaining evidence

Throughout the experiment I have been working safely to collect my ...

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