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The first characteristic of AC power is its "amplitude." Amplitude is the maximum value of current or voltage. It is represented by either of the two "peaks" of the sine wave. This voltage level is also referred to as the "Peak Voltage," and it can be either positive or negative. Positive and negative refer only to the direction of current flow. A negative number does not mean that the
voltage or current flow are less than "zero," only that the current flows in the opposite direction.
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