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I intend to study a circuit, in which I will determine the electro motive force (emf) and total internal resistance (tir) of a power supply.
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Practical assessment - Power supply. Aim: I intend to study a circuit, in which I will determine the electro motive force (emf) and total internal resistance (tir) of a power supply. Diagram: E = emf, r = tir, R = potentiometer, V = voltmeter, A = ammeter. Results of preliminary trials: I did some preliminary testing to determine the range over which the variables will change, here are the results... V / volts I / amps 1.180 10.00 1.350 9.00 1.490 8.00 1.660 7.00 1.820 6.00 ... From my preliminary tests I found that a decrease of 1A results in an increase of 0.16V on average. Thus I have decided that a decrease of 0.5A for each reading should give me enough information to calculate the emf and tir if I were to take seven readings. Method: I will set up my equipment as shown and as I vary the current on the potentiometer, and read the voltage from the digital voltmeter (accurate to 100th of a volt) I have...
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