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# Resistance of a wire coursework GCSE watch

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1. 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. I have to give a use for the experiment in a workplace and describe how the experiment is used ina workplace and expalin why it is useful. I have to give example of the types of orangisation that use it but i dont't have a clue. Please could someone help me.
2. A wire making firm that has to find the reistance of all the wire manafactured before sale? Also there was a strain gauge mentioned on a past A level exam I did. They put them on a bridge for example and if the size of the bridge alters slightly the resistance of the wire alters. Allowing the change to be monitored
3. I suppose companies could use the Resistance to ensure the Cross Sectional Area (The thickness of the wire) was the correct amount - A thinner wire means more resistance. A company making guitar strings could put an electrical current through to ensure that the thickness was the correct amount, maybe. Anything that needs the Cross Sectional Area measured could be used... A metal spear making company?

I don't think you come across the equation Resistance = Resistivity x Length / Area at GCSE, but that's how you can show that.
4. A lot of it is also down to heat dissipation as well. When buying or using a wire in electrical applications you need to know what current you can put through before the wire burns out or becomes too hot. That depends on the resistance. Wire's must have a current rating of what you can put through them, health and safety etc and commercially this can't be exceeded.

Besides, resistance is a very important quantity since it determines the current and voltage relations for all the components. Some of the components are very sensitive to what current or voltage they need. Similarly you often need to "impedance (fancy term for resistance) match" two wires in a circuit so that the flow of current is efficient.

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Updated: March 15, 2008
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