The amplitude of a wave is the maximum displacement of the particle of the medium from its equilibrium position. It is represented by A. The Amplitude formula can be written as
\begin{array}{l}y=Asin(\omega t+\phi )\end{array}
where,
y is the displacement of the wave in meters
A is the amplitude of the wave in meters
ω is the angular frequency given by
\begin{array}{l}\omega =\frac{2\pi }{t}\end{array}
Φ is the phase difference