Types of Electricity
Current flowing in one direction only is called direct current. The letters “DC” Represent direct current. A battery generates direct current. The voltage source behind it This DC current has the same polarity all the time. The current flow is from negative to positive.
Mostly you work with alternating current. The letters “AC” represent AC. It’s called AC because it changes directions (changes). An AC The cycle consists of a positive and a negative change. AC current flows in one direction for half one cycle then reversed for half a cycle. In the US we use 60 cycles per Second (60 Hertz (Hz).) Since there is one positive and one negative change per second Cycle, 60 Hz alternating current changes direction 120 times per second.