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Why, Alternating Current and Direct Current, of course! Both AC and DC describe types of current flow in a circuit. In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction.
Its fields also cycle at 60 Hz and are referred to as Extremely Low Frequency (ELF) fields.Direct current (DC) is constant, like current from a battery. Its electric and magnetic fields are also constant (frequency of zero) and are referred to as static fields.