That depends on what discipline you're studying.
In Physics: the maximum extent of a vibration or oscillation, measured from the position of equilibrium.
• the maximum difference of an alternating electrical current or potential from the average value.
In Astronomy: the angular distance of a celestial object from the true east or west point of the horizon at rising or setting.
In Mathematics: the angle between the real axis of an Argand diagram and a vector representing a complex number.
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Amplitude ratio to dB conversion:For amplitude of waves like voltage, current and sound pressure level:GdB = 20 log10(A2 / A1)A2 is the amplitude level.A1 is the referenced amplitude level.GdB is the amplitude ratio or gain in dB.dB to amplitude ratio conversion:A2 = A1 · 10(GdB / 20)A2 is the amplitude level.A1 is the referenced amplitude level.GdB is the amplitude ratio or gain in dB.
The amplitude is 1.
That if the original amplitude was A then it is now 2*A.
Amplitude is just themaximum displacementof a wave:
The amplitude is ' 1 ' .