# Find out how the length of the wire affects its resistance.

Hayley Thorpe    10F            Science       Course Work               (Resistance)

Science Coursework.

Aim:

I want to find out how the length of the wire affects its resistance.

Method:

1. Set up the circuit with the... cm wire
2. Switch on the power supply
3. read the voltage across the wire, and the current
4. Change the length of wire x to 40cm, 60cm, 80cm, and 100cm
5. Read the voltage and current
6. Record voltage and current in results table.

Factors:

The factors are:

• The current
• Length of wire
• Voltage across the wire
• Power Supply

The factor which I will change will be the length of the wire, because I want to know how the length of the wire changes the resistance. Additionally I will be measuring the wire. The factors that I will be controlling would be the power Supply to find the Current the equation is I=V/R

• I= The Current
• V= The voltage
• R=The resistance

The factors I will keep the same are:

• The type of metal being used, I will make sure that only copper wire is being used.
• The cross sectional area of the wire, I will make sure that this stays the same by making sure the same wire is being used all the time.
• The temperature of the wire-I will keep the current the same, this will ensure that the wire does not overheat. I will take 3 readings from each of the lengths and then use the average to put into my results table... Resistance will be calculated by voltage/current. I will make sure that the wire or any other component gets too hot by keeping safe levels of current

The power supply will beat the same setting all the way through the experiments will the same material same piece of wire.

The factor that I am going to investigate is the length of the wire. I will constantly increase the length by 10cm starting at 10cm and ending at 100cm. Current is the flow of electrons around a circuit. For an electric current to flow, there must be no gaps in the circuit. Electrons flow from atom to atom round from the negative pole to.

A Fair Test:

It would be a very good fair test ...