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# An investigation to find out if the length of a wire affects the resistance in a circuit.

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Introduction

An investigation to find out if the length of a wire affects the resistance in a circuit……

Introduction:

In this experiment I will investigate how resistance is affected in a circuit. I will be testing in this experiment how the length of a wire affects the resistance in a circuit by using only one variable which is the length of a wire used; the other variables will be fixed such as the voltage at 4V, type of wire (which metal, thicknesses, etc.) The resistance will be calculated using this equation:

Resistance  =  voltage (in volts, V)

(In ohms Ω)     current (in amps, A)

Aim:

To investigate how resistance is affected in a circuit.

• Plan the investigation
• Collate and represent the information produced
• Use the information to produce an evaluation

Fair testing/variables:

Variables:

• Length of wire (C)
• Thickness of wire (S)
• Metal wire is made of (S)
• Shape and pattern of wire (S)
• Voltage that flows through the circuit (S) at 4V
• Temperature of wire (S)
• Components in the circuit (S) at 3 components
• A.C or D.C current (S) at D.C

Fair testing:

I will make my investigation a fair test by following procedures:

• Using the same apparatus throughout the experiment
• Same ammeter, power pack, crocodile clips
• Accurately measuring the length of wire
• Reading the ammeter accurately
• Using new wire because the wire can get hot every time you run current through it so it could change shape or get thinner this may also so be a crucial reason for anomalies.

Middle

• Neutrons (with no charge)
• Protons (with a positive charge)
• Electrons (with a negative charge)

The protons and neutrons form the nucleus of the atom and the electrons from a shell type enclosure. The structure of this atom is vital, in fact crucial to the understanding in how current and voltage work. I discovered using scientific information that the movement of electrons creates an electrical charge meaning that the more movement increases the charge and the current gets bigger. The energy in a circuit that is given off powers the electrons to move while being pushed thus the circuit is complete.

As shown in diagram C the resistance is affected by every single component which uses up the energy held by the charge from when it received it from the cell. This indicates that the push changes through out the circuit and is lost from the cell meaning the push is all ways changing and that the experiment can only be accurate to a certain degree.

Another factor effecting the experiment is which metal the coil of wire will be made out of and that the same should be used every time because every metal has its own no.

Conclusion

On the other hand many good precautions were taken such as taking three reading so that they could be averaged and more accurate results. Also I used the full readings and then put them to two decimal places at the very end.

Overall this investigation was very well balanced and that the good points cancelled out the problems. I am very pleased.

Usman Mirza 10s

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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