Alternating current (AC) is the flow of ____; this rises to a maximum value in ____ and then falls back to zero, before repeating the process in the ____ direction.The electrons within the ____ do not just flow in one direction. They move ____ and forwards. The journey taken from start to finish is one cycle; the number of cycles that occur every second is said to be the ____. When we look at a sine wave, there are several values that can be measured from the alternating waveform.

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