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Direct vs. Alternating Current
In direct current the current continually moves in only one direction. Batteries use this type of current to generate electric power.
In alternating current, the charge carriers continually change direction of movement (back and forth) in opposite directions. Most devices run off of this type to minimize loss of power, since the charge carriers do not actually have any displacement.
You are charged money per
kilowatt-hour used at your home.
Energy loss is proportional
to the square of the current.
Decreasing current is more
important than decreasing
resistance.