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There are two analogies that I like to use when I introduce this subject:
Voltage is like a water tower high above the ground -- the water is current,
and a resistor is like a narrow section of pipe. It is easy to visualize
the pipes in series and parallel.
For R = rho(L/A), a resistor is like a crowded hallway. The longer and
narrower the hall, the greater the resistance. Rho can be the number of
people per length of hallway.