On a graph, the amplitude of a signal is the value of the signal at any point on the wave. It is equal to the vertical distance from a given point on the waveform to the horizontal axis. The maximum amplitude of a sine wave is equal to the highest value it reaches on the vertical axis.
Amplitude is measured in volt, ampere, or watt, depending on the type of signal. Volt refers to voltage; ampere refers to current; and watt refers to power.
Amplitude is the height of the signal. The unit for amplitude depends on the type of the signal. For electrical signals the unit is normally volts, amperes, or watts.
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