Read the following section in The Physics Classroom:
Physics Tutorial: Current Electricity: Lesson 2: What is an Electric Circuit? Also here.
Questions to answer while reading:
How is electric potential similar to gravitational potential? Hint: imagine the charges "falling" from the top plate to the bottom plate.
Why would charge flow more easily through the "charge pipe" (wire) than through air?
To keep current flowing, what must happen to the charges once they "fall" down to the negative plate?
Define an electric circuit.
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