I will place one crocodile clip at 0cm on the wire and the other at 5cm to complete the circuit. I will then turn the power pack on and record what voltmeter and ammeter readings. I will switch off the power pack, move the crocodile clip that was at 5cm up to 10cm, and switch on the power pack.
Theory What is resistance? Electricity is conducted through a conductor, in this case wire, by means of free electrons.
The number of free electrons depends on the material and more free electrons means a better conductor, i. For example, gold has more free electrons than iron and, as a result, it is a better conductor. The free electrons are given energy and as a result move and collide with neighbouring free electrons.
This happens across the length of the wire and thus electricity is conducted. Resistance is the result of energy loss as heat.
It involves collisions between the free electrons and the fixed particles of the metal, other free electrons and impurities. These collisions convert some of the energy that the free electrons are carrying into heat.
How is it measured? The resistance of a length of wire is calculated by measuring the current present in the circuit in series and the voltage across the wire in parallel.
These measurements are then applied to this formula: This means that the resistance of a metallic conductor is constant providing that the temperature also remains constant.
Furthermore, the resistance of a metal increases as its temperature increases. This is because at higher temperatures, the particles of the conductor are moving around more quickly, thus increasing the likelihood of collisions with the free electrons.PDF Gateway Science Suite Biology, Chemistry and Physics Controlled Assessment for GCSE Gateway Science, all of The resistance of a wire is directly proportional to the length of the wire and inversely Resistance in a Wire (coursework Evaluation) Physics Forums To get the full marks for my gcse coursework quot;how does length affect the.
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Students in STARS are passionate about science and technology, and wish to pursue careers in these fields. Mar 15, · Im doing my resistance of a wire coursework and ive done all of it apart from the last bit where i have to describe how the experiment testing the resistance of a wire could be used in a workplace.
We would like to show you a description here but the site won’t allow us. We've detected you're using an older version of Chrome. Search Service. We've detected you're using an older version of Chrome. - GCSE Physics Coursework - Resistance of a Wire Coursework Resistance of a Wire Task To investigate how the resistance of a wire is affected by the length of the wire.
Theory What is resistance. Electricity is conducted through a conductor, in this case wire, by means of free electrons.