Direct and Alternating Current

There are two broad classifications of electric power: direct current and alternating current. The main difference is in the flow of current:

Direct current (dc) is an electric current that flows in one direction only. Flow can either be steady, as shown in Figure 24-3, or variable, as shown in Figure 24-4. Figure 24-3 shows a dc current that is very tightly controlled at a constant rate. Figure 24-4 shows a more typical dc current, one that exhibits some fluctuation.

Alternating current (ac) is an electric current that flows first in one direction for a period of time, and then in the reverse direction for a period of time. It is also constantly changing in magnitude. Ac current builds from zero to a maximum in the positive direction, reduces back to zero, then builds to a maximum in the negative

Guide to Alternative Fuels

Guide to Alternative Fuels

Your Alternative Fuel Solution for Saving Money, Reducing Oil Dependency, and Helping the Planet. Ethanol is an alternative to gasoline. The use of ethanol has been demonstrated to reduce greenhouse emissions slightly as compared to gasoline. Through this ebook, you are going to learn what you will need to know why choosing an alternative fuel may benefit you and your future.

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