User:Gweenl/sandbox

ABOUT AC and DC Electricity can be generated in two quite different forms. One is called alternating current (AC), the other, direct current (DC). Alternating current is almost universally used for home electric appliances and is, therefore, the form of electricity this book is, primarily concerned with. in an AC circuit, is constantly changing from zero to a peak value and back to zero in one direction and then from zero to a peak value and back to zero in the other direction. The peak voltage is determined by the generating plant. Because voltage is the force, or pressure, that cause current to flow, the current also changes from zero to a peak repeat. The peak amount of current, tance; it can vary as the load resistance varies, Each complete change from zero to maximun to zero in the direction and then zero to maximum to zero in the opposite direction is called 1 hertz (formerly "cycle per second ") The term hertz impplies per second; therefore, 60 hertz means 60 cycles per second. You may see "cycles per second" marked on older appliances; the abbreviation is "cps>."