• 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

# Our aim is to investigate how the resistance of a know conductorconstantan varies with length.

Extracts from this document...

Introduction

GCSE Physics Coursework Resistance of a Wire Aim: Our aim is to investigate how the resistance of a know conductor constantan varies with length. Background information: When electricity is conducted through a conductor, in this case a wire, the number of free electrons determines how much resistance there is, i.e more free moving electrons means less resistance. The free electrons are given energy and move and collide with other electrons; this happens across the length of the wire and electricity is conducted. Resistance is the result of energy loss as heat. The resistance is calculate by measuring the current in the circuit and the voltage across the wire. These measurements are then put into this formula: V = I * R V = Voltage I = Current R = Resistance Ohm's Law states that the current through a conductor at a constant temperature is proportional to the potential difference. ...read more.

Middle

We attached the voltmeter to the 3cm marking and recorded the voltage; we then did the same at 6cm and so on. Safety: In order to carry out a safe experiment we chose a low voltage of 9V to minimise overheating. We were careful to not touch the wire whilst we were recording data, because the wire might have been hot. Results: Length of Wire (cm) Voltage Amps 3 0.7 0.6 6 1.2 0.6 9 1.6 0.6 12 1.9 0.6 15 2.3 0.6 18 2.7 0.6 21 3 0.6 24 3.4 0.6 27 3.8 0.6 30 4.2 0.6 33 4.6 0.6 36 4.9 0.6 39 5.3 0.6 42 5.7 0.6 45 6.1 0.6 48 6.4 0.6 51 6.8 0.6 54 7.2 0.6 We then repeated our experiment Length of Wire (cm) Voltage Amps 3 0.7 0.6 6 1.2 0.6 9 1.6 0.6 12 2 0.6 15 2.3 0.6 18 2.7 0.6 21 3.1 0.6 24 3.5 0.6 27 3.8 0.6 30 4.3 ...read more.

Conclusion

Evaluation: From my results table and graph I can see that my results that I collected are very reliable. I know this because my results table does not show any individual irregular results this means that I did not have to leave any results out of my averages because they were irregular. To improve on my results I would use a digital voltmeter instead of an analogue meter. I would do this because a digital voltmeter is a lot more accurate than an analogue because if the needle in the analogue voltmeter is bent then the readings given off will be false whereas a digital voltmeter does not rely on a needle or any other manual movements. As well as making this modification I would also improve my Investigation by testing the same wire but different widths of that wire. I would do this to expand on my Investigation. ...read more.

The above preview is unformatted text

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. ## An experiment to find how the resistance of a pencil lead varies which the ...

Scientific knowledge My reasons for my prediction are: As the length increases, the electrons that form the current will have to travel a greater distance along the pencil lead. This means that the number of collisions between the electrons and the graphite atoms will increase, causing the electrons losing kinetic energy to the atoms.

2. ## How The Resistance Of A Wire Varies With Length.

From this I then worked out the current. Preliminary Results: Problems: However many problems did occur with this first experiment. First of all the ammeter and voltmeter kept comming up with negative readings or none at all. The wires kept comming loose and the wire was not straight so the measurments would not of been accurate to the nearest millimeter.

1. ## To investigate how the resistance of a wire varies with its length.

Preliminary work: Current (A) Measurement (CM) Voltage (V) 2.0A 10CM 0.4 1.5A 10CM 0.3 1A 10CM 0.2 0.5A 10CM 0.1 Current (A)

2. ## To investigate how the power of an electrical heater varies with the voltage supplied ...

2.88 we can now use this formula to predict this for more voltages: 2� x 2.8 = 11.52 3� x 2.8 = 25.92 4� x 2.8 = 46.08 5� x 2.8 = 72 6� x 2.8 = 103.68 Fair Testing To ensure my method is done fairly, I must consider a few points.

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