• 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

# Factors Affecting The Resistance Of A Wire

Extracts from this document...

Introduction

Page  of

Factors Affecting The Resistance Of A Wire

### Introduction

In this investigation I am going to be looking at which factors may affect the resistance of a wire. A current will be passed through a given wire of a pre-determined length.  For an electric current to flow, there has to be a source of electrons i.e. a battery. Electrons are released from the negative battery terminal (-), and attracted by the positive terminal (+) through the circuit. The resistance of the circuit will limit the amount of electrons moving through it.

The direction of current flow can be considered in two ways, either as conventional current where the flow is from positive to negative or as electron flow from negative to positive. Both are valid. In simple d.c. circuits then conventional current is appropriate. However if an electric field is applied to some free electrons in a copper wire, the electrons start moving, and a current is established. So perhaps it seems that the current should continue forever. After all, a force has been applied, and by Newton's first law (in the absence of friction or other forces, a body in motion will remain in motion), the electrons should keep going.

Middle

V = I x R, This formula would give the voltage.

This formula can then be rearranged so that it gives resistance, this formula is…

It all depends on what you are trying to work out.

### Apparatus I will use

In this experiment I am going to be using many different pieces of equipment, here is a list of all the items I plan to use during my experiment.

• 1 Ammeter
• 1 Voltmeter
• 1 Power Pack (Transformer)
• 1 Un-insinuated, Wire (just over 1 meter long) (approximately # different types)
• 2 Crocodile clips
• 1 Meter Rule

As you can see there is more than one type of wire, this is because it is the only variable I will use in this experiment at the moment; this means that it will be the only thing that will change in the experiment. This is to make the experiment fair and it will also allow me to do the experiment easier because there is only one thing that needs changing.

How to put the apparatus together

1. Connect the power pack to the mains. Making sure that the power pack is turned of at the power switch.
2. Take 2 wires and connect them to the negative and positive terminals of the D.C. power supply.

Conclusion

Nichrome, 28SWG, Diameter 0.375mm

1. One metre length of 0.375mm diameter “Nichrome” (a metal alloy) wire is fixed to the metre rule.

2. The first crocodile clip is clipped to the wire at the 0cm position on the metre rule.

3. The second crocodile clip is clipped to the cable at 10cm intervals of the one-meter length of the given cable.

4. The voltage and current are then read off the ammeter and voltmeter, and recorded at each of these 10cm intervals.

5. The power supply is then turned off allowing the cable to cool down before continuing with next interval on the cable.

(The power passing through the circuit has to be less than 5v, this is because the resistance in the wire causes heat, and if the voltage is too high it will melt the wire.)

RESULTS FOR THE CHANGING THE LENGTH OF THE CABLE

 Length (m) 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 Current (A) 1.02 0.67 0.56 0.42 0.32 0.31 0.28 0.26 0.24 0.23 Voltage (V) 1.34 1.66 1.93 2.05 2.13 2.24 2.37 2.41 2.48 2.57 Resistance (Ω) 1.31 2.48 3.45 4.88 6.66 7.23 8.46 9.27 10.33 10.74 Expected Resistance using the formula above Resistance (Ω) 0.98 1.97 2.95 3.94 4.92 5.91 6.89 7.88 8.86 9.85 % ERROR 33.06 25.95 16.81 23.92 35.29 22.39 22.75 17.69 16.58 9.09

To work out the percentage error (how far away from the expected resistance) I divided the value  I got by the value I expected and multiplied by 100.

As you can see my predictions were within 40% accurate.

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. ## The factors affecting the resistance of a metalic conductor.

4 star(s)

Another factor that affects the resistance of a metallic conductor is the type of circuits being used to conduct the current through the conductor. There are 2 types of circuits used: * CIRCUITS IN SERIES * CIRCUITS IN PARALLEL SERIES CIRCUITS: A series electrical circuit is a circuit where the components share the current flowing around the circuit.

2. ## Draw stress and strain graphs for the metal copper and the alloy constantan. Calculate ...

4 star(s)

The following is a method for the experiment: 1. All equipment will need to be collected, table, wooden blocks, copper and constantan wire, pulley, masses and mass hangers, G-clamp, sellotape, marker and a metre rule. 2. Collect both copper and constantan wires together and cut to 2.1m long each using

1. ## An experiment to find the resistivity of nichrome

I would do this to expand on my Investigation. current and resistance investigation Aim: Investigate how the length of a wire affects the current and resistance of a wire. Prediction and Hypothesis: I think as you increase the length of the Constatan wire, you also increase the amount of resistance.

2. ## Factors Affecting the Efficiency of a Wind Turbine

Hypothesis As the blades are shaped to become more aerodynamically efficient, the tip-speed ratio will increase resulting in better performance. This is what is expected. Tip-Speed ratio The tip speed ratio is vital. It is directly proportional to the wind turbine's productivity.

1. ## Investigate one or more factors affecting the resistance of metal wires

I have decided not to investigate type of material since there are not a sufficient number of materials for me to investigate how this factor affects the resistance of a wire. Another disadvantage of investigating type of material is that it does not provide continuous data, consequently, not giving a good line graph.

2. ## Conductors and Insulators.

and a wire. What a battery produces is electrons. The figure below shows the shape of the magnetic field around the wire. In this figure, imagine that you have cut the wire and are looking at it end-on. The green circle in the figure is the cross-section of the wire itself.

1. ## Discover the factors affecting resistance in a conductor.

The factors affecting the resistance in a conductor are as follows. i) Resistance increases as the conductor's length increases. ii) Resistance increases as the conductor's cross-sectional area decreases. iii) Resistance varies depending on the type of material being used. All metals are good conductors.

2. ## Factors affecting Resistance of a wire

Place the crocodile clip at 10cm on the metre stick. Make sure it is clipped firmly to the wire (i.e. the teeth are touching it). Turn on the power supply and test to see if it is working. If not check that all wires are connected correctly and that the bulb is not faulty.

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