# How Does Length Affect Resistance? Essay

Coursework

Aim

To find out how the length of a wire can affect resistance.

Factors affecting resistance

Temperature

Length of wire

Thickness

Type

Resistance is a force which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit.

Resistance is measured in ohms. The symbol for an ohm is Ω

Here is the rule for working out the resistance of a circuit: V/I = R or

V - Volts

I - current

R - resistance

Variables

length of wire

thickness

type of wire

current

voltmeter

temperature

Dependant variables

length

Prediction

As we are

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Ohm's law states that the current flowing through the circuit is directly proportional to the voltage applied. (If you double one, you double the other.)

I worked out the resistance of the wires by using the formula:

V/I = R or

This happens because of the electrons that flow through the wire. These electrons travel at a steady pace, when they come to a different piece of wire, they have to slow down in order to be able to pass. While moving through the wire, the electrons need to squeeze together. This is because there is not enough room/space for them to pass evenly through. The more the electrons have to bump together then the higher the resistance. This is because it will take longer for them to pass from one side of the wire to the other side. This is because the current is slowed down. (The longer the wire, the longer the electrons have to stay squashed together, and so the longer they take to pass through the wire and the higher the resistance. Note that we used the nichrome wire because the material of the wire makes a difference because it is harder for electrons to pass through some materials than it is