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# In this piece of coursework, the class has been asked to investigate the resistance of a wire (Copper).

Extracts from this document...

Introduction

Resistance Of A Wire

Aim:

In this piece of coursework, the class has been asked to investigate the resistance of a wire (Copper).

The thin wires in lamps tend to resist the movement of electrons across it. This Wire has a certain resistance to the current. The greater the resistance of the wire, the more voltage is needed to punch the current through the wire. The resistance of a wire is directly proportional to the current and this is calculated in this way:

Resistance (R) = Voltage (v) across the wire in (p.d)

Current (I) through the wire

In 1826, George Ohm discovered that the current flowing through a metal wire is proportional to the potential difference across it, providing the temperature remains constant.

Middle

More electrons going through due to

Cross-section width.

Variables:

• The main variables, which affect the resistance, are the length and width of the wire and the voltage.
• The independent variable, which I will be altering, is the length of the wire.
• The dependant variable, which I will be measuring, is the resistance of the wire.
•   The control variables that I will keep the same is the voltage

Apparatus:

• Voltmeter
• Ammeter
• Switch
• Variable resistor
• Electrical Supplier (Power Pack)
• Wire

Method:

The apparatus have to be put together in a series circuit as shown in the diagram that follows. The variable resistor is a part of the circuit, but is just to enable that once a suitable current is found, it is used through the whole experiment.

Conclusion

In my prediction, I predicted that the longer the length of the copper wire, the higher the resistance will be and this is because the longer the wire, the more energy is needed to push and force the electrons through the wire. This theory or scientific explanations supports my results and prediction.

Evaluation:

I think the experiment went quite well and successful due to the results being accurate and reliable enough to support my prediction and theory which was the longer the length of the wire, the higher the resistance will increase. They were accurate because as the wire gets longer, the resistance increases too.

I could have improved my experiment and my results by cutting the copper wire more accurately for each of the ten lengths.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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