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Measuring Internal Resistance

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Measuring Internal Resistance I am going to do an experiment to measure the internal resistance of different power sources. The different sources I am going to measure the internal resistance of are dry cells, a solar panel, a car battery and a power pack. The apparatus I am going to use are a voltmeter, an ammeter, a variable resistor, power source and a floodlight to power the solar cell. ...read more.


To avoid this happening I am going to keep the resistance quite high. To improve accuracy with the dry cell I am going to use 4 dry cells and take the average, also with all the sources I am going to try and get a wide range of results at least 7 measurements for each. ...read more.


I will then draw a best-fit line so that I can work out the internal resistance by calculating the gradient. The gradient shows me the internal resistance because: Lost p.d./current = internal resistance I have shown below how this is true: The line AB represents the lost p.d. and the line BC represents the current. The line AC shows AB/BC, which is the same as the internal resistance. ...read more.

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