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# John Jevons - 11HD

Extracts from this document...

Introduction

John Jevons – 11HD

GCSE Science Coursework: Physics Investigation

Aim: To investigate if the length of a wire determines the resistance of a wire by using different lengths of nichrome wire.

Planning:

A Current is measured in amps (A). It is a measure of the charge that flows per second. It uses the formula Current = charge / time. Charge in itself represents the number of electrons flowing through the wire per second. It is measured with an ammeter.

Resistance is where a metal wire is connected to an electric circuit, and the voltage from the battery sends electrons through the wire. The electrons that collide with the metal ions of the wire and slow down. Resistance is measured by how freely the electrons move within a metal wire, high resistance meaning that the electrons have difficulty moving, while a low resistance, meaning the opposite, that they move freely and aren’t slowed. The four following factors affect resistance:-

Thickness of the wire –

Middle

Length (cm)

Voltage (V)

Current (A)

Resistance (Ω)

10

3.26

4.52

0.72

20

3.84

2.95

0.96

30

4.30

2.28

1.89

Constantan

 Length (cm) Voltage (V) Current (A) Resistance (Ω) 10 3.27 4.91 0.67 20 3.86 3.01 1.28 30 4.34 2.34 1.85

Copper

 Length (cm)

Conclusion

Wire = Nichrome

 Thickness (wsg) V I R 26 1.05 3.30 0.32 30 1.74 3.06 0.57 32 2.65 2.73 0.97 34 3.14 2.58 1.22

This table shows me that that the thicker the wire gets, the higher the resistance, and because there were 4 thicknesses it shows everything in good accuracy. These values can be inaccurate because of some factors.

• The diameter of the wire could not be measured thoroughly enough because it gets too small for equipment to measure.
• There is a smaller range, so its not accurate enough, whereas with lengths, you can measure as many as you want.
• In my investigation I will use 30 SWG for my thickness of nichrome wire.

This atomic model for resistance in a metal depicts a nucleus surrounded by negatively charged electrons. In solids (wire, etc), the outer electrons of each atom form a bond between them that hold the solid together, and in a metal these bonding electrons are free to move about throughout the solid, and when a voltage sends its current through the metal, the electros start to move about, following the current.

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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