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Physics coursework Investigation to compare the internal resistance's of different cells. My task is to compare the internal resistances of different cells. I will first make a prediction what I think the relation may be. Then I will carry out preliminary and final experiments. After this I will then evaluate and analyse all of my results. Internal resistance is: "The resistance within a voltage source, such as an electric cell or generator." (http://www.answers.com/topic/internal-resistance-electricity) EMF (electromotive force) "The energy per unit charge that is converted reversibly from chemical, mechanical, or other forms of energy into electrical energy in a battery or dynamo." (http://www.answers.com/topic/electromotive-force) No real devices (batteries, amplifiers, generators) are perfect and so all have an internal resistance. The resistance is caused because the charge has to flow through the cell. When it does this it comes into contact with wires or chemicals which all have resistance so even though when travelling through the cell the charge...

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