• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6

# To investigate how the length of a piece of wire affects its resistance.

Extracts from this document...

Introduction

Resistance of a Wire

Aim

To investigate how the length of a piece of wire affects its resistance.

Prediction

I predict that when the length of the wire is increased, the resistance will increase. I think this

because -

When a current flows through a piece of wire, a heating effect is caused by the resistance.

This is useful in appliances where heat is needed e.g. Kettles and Heaters.  In a piece of

wire the atoms are arranged in an order. One example is shown below.

The outer electrons are free to move about, and these form the current. The electrons move

randomly through the atoms, bouncing off them, losing energy. If the wire was made longer

there would be more atoms for the electrons to collide with, so they will lose more energy,

meaning the resistance is greater.

I also predict that the graph will be a straight line graph that looks like this -

I think this because, if you double the length of the wire, there would be twice as many

atoms for the electrons to collide with. This means they would lose twice as much energy,

Middle

to the resistance, so when recording results we will disconnect the circuit as soon as they

have been taken to stop it heating too much.

We will keep the equipment the same and the wire will be measured by a meter stick to

ensure accuracy.

Results

A Table to show how the resistance through a piece of

wire varies with length

Test 1

Test 2

Test 3

Length /

Voltage

Current

Resistance

Voltage

Current

Resistance

Voltage

Current

Resistance

Conclusion

wires get hotter, the atoms vibrate more, so it is harder for the electrons to get, through and

they lose more energy, so the resistance increases. It could also have been because the wire

wasn’t measured correctly, for example if there was a twist in the wire that we didn’t notice,

which would increase the length. This means there would be more atoms for the electrons to

collide with so the resistance would increase.

The points are very tightly scattered, with only one or two points being off the line, and they

are still quite close, showing  that our results are reliable.

To improve this method and prevent errors we could use a water bath to keep the

temperature constant. The wire would be placed in the water bath and then tested.

To make sure the wire was accurate, new wire would have to be used, and made sure it

was flat. It would then be measured using a metre rule to measure to the centimetre.

Our results supported my conclusion and allowed me to make a firm conclusion. They were

reliable, close to the line of best fit and supported our preliminary work.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related GCSE Electricity and Magnetism essays

1. ## Investigating how the length of a Wire affects its resistance.

This is because the current is so small. Because I have got results this accurate, I can say that my method at least was good enough to obtain results of this accuracy in order to draw a conclusion and prove my hypothesis right. It may be possible to criticise my way of carrying out the investigation because the current used is low.

2. ## To investigate how the length (mm) and the cross-sectional (mm2) area of a wire ...

I Av. V Av. R I V Av. I Av. V Av. R 10 mm x A x V x A x V x ? x A x V x A x V x ? x A x V x A x V x ? y A y V y A y V y A y V z

1. ## Investigate how mass affects the diameter of an impact crater.

The calculations of the square root of mass are also tabulated below. VMASS (G) AVERAGE CRATER SIZE (MM) 2.23606798 45 3.16227766 52.66 3.87298335 63.33 4.47213595 66.66 5 75 5.47722558 79.66 5.91607978 82 Refer to graph 5. As can be seen from the graph the crater size increases at a constant

2. ## Investigation: How length affects the resistance in a wire.

0.82 0.82 0.81 0.82 0.4- Voltage (V) 3.99 4.02 4.00 Current (A) 3.81 3.82 3.80 Resistance (W) 1.05 1.06 1.05 1.05 0.5- Voltage (V) 4.00 4.00 4.01 Current (A) 3.01 3.00 3.01 Resistance (W) 1.33 1.33 1.34 1.33 0.6- Voltage (V) 4.00 3.99 4.01 Current (A) 2.44 2.43 2.44 Resistance (W)

1. ## To Investigate the Relationship between the Resistance and the Length of a Wire

Current, A Voltage, V Resistance, ? 0.08 0.75 9.38 0.10 0.95 9.50 0.12 1.18 9.83 0.13 1.25 9.62 0.15 1.48 9.87 0.18 1.70 9.44 Mean Resistance, x = 9.61 Table 5f Result from Pilot Experiment 2: Nichrome: 60.0 cm 32swg (0.27mm)

2. ## Investigate how length affects the resistance in a piece of constantan wire.

Also, the wire would melt under the current involved, acting as a fuse. So, I will investigate length. Prediction I predict that as the length of the wire increases, the resistance will also increase. I predict that resistance is directly proportional to length (RL)

1. ## What affects the resistance of a piece of wire

This can be linked to the Ohm's law. The voltage across a metal conductor is proportional to the current through it, provided the temperature stays constant. This can be written as: V x I Because V is proportional to I, we can say that: V/I = a constant Ohm showed that doubling the voltage doubles the current.

2. ## Find out how the length of a piece of wire affects is resistance.

The electrons carrying the charge are trying to move through the wire, but the wire is full of atoms and the electrons keep colliding with the positive nuclei that keep colliding in the way and making the electrons use more energy.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to