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In building wiring, the hot wire and the neutral wire never touch directly. The charge has to work hard to move along, which heats up the filament, causing it to glow. A light bulb, for example, has a filament inside that is very resistant to flowing charge. This resistance is what makes the appliance work.
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All of the different light bulbs and electrical appliances offer a certain amount of resistance, also described as the load. The power distribution grid delivers electricity at a consistent voltage (120 and 240 volts in the United States), but resistance (and therefore current) varies in a house. (See How Power Distribution Grids Work for more information.) The current is said to be alternating current, because it rapidly changes direction. Because the hot wire connects to a high energy source, and the neutral wire connects to an electrically neutral source (the earth), there is a voltage across the circuit - charge moves whenever the circuit is closed.
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The other end, called the neutral wire, leads to ground. One end of the circuit, the hot wire, leads to the power plant. Inside your house, the electric charge moves in a large circuit, which is composed of many smaller circuits. The power distribution grid delivers electricity from a power plant to your house. This diagram shows the basic parts and design of a circuit breaker.