The aim of this investigation is to investigate how the length of wire will affect the amount of current flowing through the circuit.

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Physics Investigation

Lengths of Wire

The aim of this investigation is to investigate how the length of wire will affect the amount of current flowing through the circuit.

There are several materials that will be needed for this experiment. A power supply which will feed a current of 1V through the circuit, several wires with crocodile clips attached to connect the various components, an ammeter to measure the current of electrons flowing through the circuit and a length of approximately 75cm of 28SWG Constantan wire to conduct the test with.

In this investigation, we will set up a simple circuit to find out how the current changes, when flowing through different lengths of Constantan wire. The length will range from 20cm - 70cm (0.7m) with intervals of 10cm. We will move the crocodile clip across the length of wire, using a ruler to measure the intervals. Three ammeter readings will be taken from each length of wire. We decided that the best thickness of wire to use would be 28SWG. This thickness gave us a wide range of results from the preliminary readings.

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The circuit should be set up as in the circuit diagram below. It is important that the ammeter is set up in series.

 

To ensure that the investigation is carried out in a fair way and that the results will be accurate and reliable, a number of points must be considered.

The only variable in the test will be the length of the wire. The wire must be pulled tight against the ruler to ensure the length ...

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