• 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
7. 7
7

# We are investigating how the current flow through a wire, which is part of an electrical circuit, can be altered. In doing this the resistance of the wire will be measured.

Extracts from this document...

Introduction

## Introduction

We are investigating how the current flow through a wire, which is part of an electrical circuit, can be altered. In doing this the resistance of the wire will be measured. It’s an extension of earlier GCSE work using cells, lamps, ammeter, voltmeter and variable resistors.

There are two types of circuits, series and parallel. In class experiments we found out that for:

• Series circuits- more lamps in series, the lamps become dimmer and the current flow through them becomes less.
• Parallel circuits- more lamps in parallel, the lamps remain equally bright and the total current splits equally between each branch of the circuit.

Something has happened to the resistance in each type of circuit.

Series circuit = More lamps = More resistance = Less current.

Parallel circuit =More lamps = More current = Less resistance.

This is because as the resistance of the lamp increases, the temperature of the filament wire also increases; therefore the particles in the wire vibrate more and make it harder for the electrons to pass through.

## Background Information

The and materials I have used are:

Class notes

AQA GCSE science

CGP GCSE physics

## Prediction

Middle

0.7

0.09

0.15

0.20

0.30

0.30

0.28

0.29

20

0.16

0.26

0.37

0.52

0.52

0.52

0.52

30

0.23

0.38

0.53

0.76

0.76

0.76

0.70

40

0.29

0.50

0.70

0.96

1.00

1.00

0.98

50

0.37

0.62

0.86

1.23

1.24

1.22

1.23

60

0.44

0.73

1.02

1.46

1.46

1.45

1.43

70

0.58

0.98

1.37

1.93

1.96

1.95

1.94

80

0.65

1.09

1.53

2.16

2.18

1.70

2.01

90

0.67

1.12

1.56

2.23

2.24

2.28

2.25

100

0.73

1.23

1.68

2.43

2.46

2.40

2.47

 Material Length of wire (cm) Current  A      B        C Voltage  A        B       C Resistance  A        B       C Average 28 swg 10 0.3 0.5 0.7 0.17 0.27 0.41 0.56 0.54 0.58 0.56 20 0.32 0.53 0.73 1.06 1.06 1.04 1.05 30 0.45 0.76 1.07 1.50 1.52 1.52 1.57 40 0.55 0.93 1.29 1.83 1.86 1.43 1.70 50 0.69 1.15 1.61 2.30 2.30 2.30 2.30 60 0.83 1.38 1.93 2.76 2.76 2.76 2.76 70 0.83 1.42 1.96 2.76 2.84 2.80 2.80 80 0.98 1.66 2.38 3.26 3.32 3.37 3.32 90 1.25 2.12 2.94 4.18 4.24 4.20 4.20 100 1.42 2.53 3.29 4.73 4.66 4.70 4.69
 Material Length of wire (cm) Current  A        B       C Voltage

Conclusion

Evaluation

After doing this experiment, I have come up with a reliable set of results.

Even though I have achieved a good set of results there are obviously going to be errors, which I have made that could affect the investigation. The errors that I came across were, the wire was very hard to get straight and had bends, the voltmeter was only accurate to two decimal places so the voltage was flickering which made it hard to tell what the exact number was. To make my accuracy better we could have done more than ten lengths, done each result more than three times, used ammeter and voltmeter sensor. We could also have used different cross sectional areas or use different materials.

I think my graph was good to look at but there are still one or two anomalous results which could have been caused by accuracy measuring instruments which we could have improved.

To support my conclusion I could do some extra work like testing more materials to see what other materials it would work with. We could test more length to see if the graph will rise in proportion or will there be a point where the graph will bend and the resistance will not go any higher.

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. ## How the length of constantan wire affects the ressistance in a electrical circuit

Taking that into account I used the same wire through out the experiment to show that if the temperature increases as to will the resistance. What did I change? In the experiment I had to show the resistance increases once you increase the size of length in the wire.

2. ## Electromagnetism - investigating what effect increasing the number of turns in a coil on ...

I will also have to change the weight that I put on the electromagnet; I will have to keep adding ten grams until the nail falls off the magnet. I will do this because it will find the strength of the electromagnet.

1. ## Investigation on Photovoltaic Cells

My conclusion explains my results which are consistent and follow a tendency. My results are reliable but I do not believe that they cover a big enough range to make a firm conclusion. The reason I was unable to investigate a larger surface area is because there was not any

2. ## Physical - Circuit

When we test the copper wire of 100cm long with 0.9mm diameter into water, it have a results of room temperature with low resistance, when the water were starting to boil, the current and the voltage both raise, and the resistance also raise with 0.5ohms.

1. ## Investigating Resistance in an electrical circuit

Copper has a low resistance and is the most efficient after silver. Materials with high resistances have their purposes in some electrical circuits too. Nichrome (an alloy of 80% Nickel and 20% Chromium) is often used as a heating element in electrical devices.

2. ## Investigating the Resistance Of A Wire When The Diameter Of The wire is altered.

If I had a 30 cm wire and a 60 cm wire, the 60 cm wire would have a resistance twice that of the 30 cm wire. 3) Type of material Different materials has different resistances because the materials' atomic structures are different so some metals have low resistances and some have high resistances.

1. ## Determining Voltage, Resistance and Current in a Parallel, Series and Series-Parallel Circuit.

Connect 2 bulbs together as show in the diagram below. 1. Measure the voltage and resistance of each bulb. 2. Measure the current in the circuit Results Series Resistance Measurement Using Multimeter Bulb 1 Resistance = 3.90 ? Bulb 2 Resistance = 3.80 ? ? Total Resistance = 3.90 +

2. ## Aim: I am going to carry out an investigation to find how the resistance ...

For a circuit to work there must be no breaks, if there is a break then everything stops. An electric charge must also go all the way round the circuit. When a wire heats up they will act differently and a blockage will be made.

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