Non-Ideal Power Sources
Pre lab
At first, we do a pre-lab finding the power of a source when it is ideal and not ideal.
a),We find that when we assume it is ideal, there is no internal resistance. We find that the current across it is 0.0455 A. And the voltage across it is being set to be 1 V. Thus, the power is just P=VI= 0.0455 W.
B),Then, we consider there is an internal resistance. We calculate the current to be 1/(22+Rs). We calculate the output Voltage is 22/(22+Rs). So the Power of it is 22/(22+Rs)^2 W.
We choose a 22 ohm resistor which is actually 22.3 ohm, we manually calibrating the output voltage from Waveform to 1V and measure the voltage across the 22.3 ohm resistor.Then we calculated the internal resistance of power source is 0.502 ohm which make sense cause it should around 0.5 ohm.
plot of function of max power
Max power lab
prelab
We calculate the theoretical power of it to be 2.84*10^-3 W.
Measured Voltage
The percentage difference is 0.3% we consider the predicted value is same with the experimental value.
Summary:
We also that power sources contain an internal resistance and how to calculate the resistance.
It is important to transfer maximum power to the load. In order to do that, the load resistance should equal the Thevenin resistance.
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