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Finding the internal resistance of a power supply.
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| Submitted: Wed Aug 13 2003
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PHYSICS INVESTIGATION : Finding the internal resistance of a power supply. A range of resistors were used -- different ones were used in the actual experiment than planned -- doesn't matter though as still good range obtained. -- Aim: The aim of this investigation is to find the internal resistance of a solar cell. This will not be measured directly but must be obtained by calculation from values of current and voltage in a circuit incorporating a solar cell. Equipment: * Solar cell (emf about 2V) * Lamp (and power pack) * Several resistors - 100?, 70?, 50?, 25?, 10?, 5? and 1?. * Voltmeter * Ammeter * Clips and connecting leads The equipment will be set up as shown in the diagram. Multimeters will be used as the voltmeter and ammeter. The lamp will be used to provide light for the solar cell. Various resistors will be used to provide a load resistance, values as above. The experiment...
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