Find The Internal Resistance Of A Power Supply

... Coursework To Find The Internal Resistance Of A Power Supply The electrical supply on satellites needs to be kept at a constant voltage and the lost volts need to be taken into account when drawing different currents. Aim The aim of this investigation is to find the internal resistance of a power supply and to see if this value changes at five different voltage settings. Using a variable resistor to vary the load resistance at different voltage settings and obtaining both ampere and voltage readings and then plotting graphs of terminal potential difference against current to find the different values for the internal resistance of the power supply. Theory We can investigate the internal resistance of a power supply by setting up a circuit such as the one shown in figure 1. The voltmeter is connected in parallel to measure the potential difference across the power supply and the ammeter is connected in series to

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