How would you know which one wins? Or what the voltage at point A would be?? At first glance it may look like it should just be 10 since that's the difference in potentials... But no, it's more complicated (such is life). You need to figure out what the current in the wire is, which is controlled by the resistance in you batteries. Turns out the side with less resistance is has the more dominate signal.You can also apply this idea to alter the output of a function generator. Say you want to add an offset to a sine wave. If you connect it to another power source (with a resistor so you don't loose the sine signal), the function generator would win, but if you add a capacitor, then the resistance on the function generator goes to infinity at for DC (0Hz) frequencies, and the alternate power source wins, and you get your offset!
Completed Lab 2-8.
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