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KEY TAKE AWAY POINTS:
Current -> Traffic flow
Voltage -> Pushing force
Resistance -> Dragging factors
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Picture from the internet
Picture from the internet
Picture from the internet
Voltage/current
Convey energy -> powering
DC
AC
Convey information -> signaling
Voltage signal
Current signal
Motions of electrons in a metal wire: Random -> Drift to a direction
Motions of electrons in a metal wire: Random -> Drift to a direction
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