The wires used in electrical circuits tend to resist the movement of electrons in it. We say that the wire has a certain resistance to the current. The greater the resistance of the wire is, the more voltage is needed to push a current through the wire. There are four factors which could affect the resistance of a wire.

2. The size of the cross-sectional area.

The aim of this experiment will be to investigate how the value of a resistance of a resistance wire changes with it’s length. To calculate the value of resistance of a resistance wire, the following formula is used;

Resistance = Potential Difference (in V)

The resistance will be calculated in Ohms, the potential difference in volts, and the current in amps.

1. Power Pack (used to control the flow of electron through the circuit)

3. Voltmeter (used to calculate the value of resistance)

4. Resistance wire (the length of which will be used to change the amount of resistance)

From my current knowledge an research of resistance, I am able to say that as theoretically, the value of resistance will increase with the increase in length of the resistance wire. Resistance wires are made of atoms molecules, it is these atoms and molecules which cause the resistance of the atoms and molecules that come in their way to pass through the circuit. The number of atoms and molecules that are in the resistance wire increase in proportion with the length of the resistance wire.It therefore seems reasonable to predict that the value of resistance will increase in proportion to the increase of the length of the wire.

From a process of comparing my hypothesis and conclusion, one is able to see that my conclusion does not entirely support my hypothesis. I was correct in predicting that the value of resistance would increase with the increase of the length of the resistance wire. However, I was wrong in presuming that there would be a direct proportionality between the variables. The experiment was successful, and no problems occurred during the practical investigation. The preliminary work that was conducted was successful in providing us with the ability to anticipate problems that may occur, and prevent them from happening in advance.

5. The crocodile clips will be attached securely.

Some topics in this essay:
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