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1) Electrons flow from a positive to a negative voltage source.

2) The path taken by the electrons through the circuit depends on the resistance of the various circuit elements.

3) Sensors attached to the circuit provide real world inputs and outputs.

4) All circuits are made using transistors. Transistors act like taps. Open the tap with a small amount of effort (a few electrons) allows a large volume of water (a large number of electrons) to flow.

Analog circuits (e.g. Amplifiers) work by varying the amount of how open the tap is.

Digital circuits (e.g. Computers) work by switching taps fully on or off.

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