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

Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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