• 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

# Investigating the factors affecting the resistance of wire

Extracts from this document...

Introduction

Investigating the factors affecting the resistance of wire

In this experiment I will be investigating if the length of wire affects the resistance

Hypothesis

The longer the wire the higher the resistance

Scientific knowledge

The free electrons in the wire leave the atoms and flow through the wire. The atoms therefore become positive ions.

The resistance will increase when the length of the wire increases because the electrons travelling through the wire in random directions colliding with other electrons and ions in the wire. If the wire is longer the electrons will collide with more ions transferring kinetic energy to the ions in the wire causing the ions to vibrate more vigorously generating heat. So the electrons transfer kinetic energy slowing them down causing the voltage (bigger difference in energy) to increase. The voltage is a measure of the energy transferred by one coulomb of charge between two points in a circuit. V = E/Q. V being the voltage, E the energy and Q the charge.

Middle

Same temperature-This alters the results (room temperature)

Same current-This alters the results

Method

1. Set up the circuit
2. Attach the constantan wire to the meter ruler
3. Clip one crocodile clip on 0cm and one on 100cm
4. Turn the dial on the P.S.U. until the reading shows 1 amp on the ammeter
5. Measure and record the reading on the voltmeter
6. Repeat this reducing the distance by 20 cm each time until the distance  is 20 cm
7. Repeat steps 1-6 twice more for repeat readings
8. Calculate the resistance using R=V/I

Range of Values

I am using 20cm – 100cm of constantan wire

Preliminary Work

I carried out the experiment to determine the

Conclusion

Evaluation

Our procedure was good we worked in a systematic way starting from 20 cm working our way up to 100 cm and then repeating our experiment three times. Our evidence was good as well with only one anomaly which we repeated to give a more precise result. I think we had an anomaly because it is extremely difficult get the current 1 amp on the ammeter and when we read the ammeter the current could have changed. The results are reliable because the averages are all close together proving that they are not anomalies. We could improve the experiment by being more accurate on the wire by attaching a thin wire to each crocodile clip reducing the area touching the crocodile clip so our measurements would be more accurate. The results are compatible with the conclusion because they matched up even with anomalies. To do further research I would get five different thickness of wire set up the circuit as before. But change the thickness instead of the length and keep the length the same and measure the voltage.

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

The type of conductor I wanted was an ohmic conductor, and I would not be sure if the conductor if I was using followed this trend. With carbon putty, I already knew that it would. I also considered varying the temperature to see how the resistance changed.

2. ## Physics GCSE Coursework:Factors affecting the resistance of a wire

equipment at arms length away from us, and we ensured that all materials that could be hazardous to our health were well out of harms way to ensure our safety.

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

All four blades were glued to the wooden cork and this has been shown on the fourth step. Distanced between blades are equal. The wooden cork was left for the glue to set. The final creation is shown on the fourth step. Blades constructed were put on a wind turbine.

2. ## Factors affecting Resistance of a wire

for our experiment to be a fair test; what our controlled variables would have to be. At a higher temperature, a wire is more resistant. So we then knew that we would have to keep the temperature constant throughout the experiment, to keep it a fair test.

1. ## Investigation into the factors affecting the resistance of wire

This is to remove any dirt or other material that could hinder the connection or increase the resistance, whilst not thinning the wire itself. Safety is very important whilst experimenting with electricity. The main safety device in my experiment is the circuit breaker in the power supply.

2. ## Investigation Into The Factors Which Alter The Resistance Of A Wire.

It is like water flowing through a pipe; we should expect more resistance when it flows through a long, thin pipe than through a wide, short one. This is like the electrons flowing through the wire from the battery, they are going to expect more resistance when the electrons flow

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