• 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

# Resistance Investigation.

Extracts from this document...

Introduction

Emma Walters

Resistance Investigation

Background Information:

I know that R=V/I.  I know that Resistance (R) is measured in Ohms; Voltage (V) is measured in Volts and Current (I) is measured in Ampere.

In a series circuit:

RT = R1 + R2 + R3…etc.

VT = V1 + V2 + V3…etc.

IT is the same all the way round.

In a parallel circuit:

1/RT = 1/R1 + 1/R2 + 1/R3…etc.

VT is the same all the way round.

IT = I1 + I2 + I3…etc

Aim:

My aim is to find the relationship between length and resistance of a wire.

Apparatus:

6 Wires

Power pack

Ruler

2 Crocodile clips

Ammeter

Voltmeter

1 Nichrome wire, 24SWG, 0.56mm.

Diagram:

Plan:

I will collect the apparatus, and set up the circuit that I have drawn above.  I will start by measuring out the wire (5cm, 10cm, 15cm, 20cm, 25cm, 30cm, 35cm, 40cm, 45cm, and 50cm).  I will check the circuit is correct, and I will set the power pack so that an input of 2V pushes the current round the circuit.  For each length of wire I will record the Voltage and current flowing through the circuit.  I will repeat these results twice, so that I can get the average.

Middle

## Length

(cm)

Current

(A)

Voltage

(V)

Resistance (R=V/I)

Current

(A)

Voltage

(V)

Resistance

(R=

Conclusion

Evaluation:

I think that my experiment did not work too badly, although there were some things that I could improve on.  The wire that I used was not very straight, which would have affected the length when I measured it, this would have affected my results.  For next time I need to make sure that the wire is straight, so that I can get more accurate results.

Heat was given off from the wire, which I noted in my observations, this would have affected the resistance a bit.  Next time I can get rid of this by having a lower voltage pushing the current around the circuit, such as 1V, instead of 2V, and maybe wait until the wire is cool before I test the next length.  This should stop the resistance being altered to something higher then it should be.

Overall my experiment went generally well.  I ended up with a straight-line graph, although it was not exactly through the origin, like it should have been in theory.  I was able to repeat my results to make them more accurate.  I have no points that are that far out of place; they are all fairly close together in the straight line, so my experiment was successful.

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