# What Is Amplitude?

Amplitude is a term used to describe the change in atmospheric pressure caused by sound waves. This change can be either positive or negative.
am·pli·tude
[am-pli-tood, -tyood]
NOUN
1.
the state or quality of being ample, especially as to breadth or width; largeness; greatness of extent.
2.
large or full measure; abundance; copiousness.
3.
mental range, scope, or capacity.
4.
Physics. the absolute value of the maximum displacement from a zero value during one period of an oscillation.
5.
Electricity the maximum deviation of an alternating current from its average value.
Source: Dictionary.com
Amplitude is the maximum value of an alternating signal. Such as Household AC Voltage has amplitude of 110 Volt. Amplitude is usually mentioned in RMS value.
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 Amplitude is the biggest movement of a vibrating object from its rest position. The distance from a place is called Amplitude. There are lots of different waves in physics, and they http://wiki.answers.com/Q/What+does+amplitude+indi...
 1. The equation for current of a simple circuit is I=V/R, where I is current, V is voltage and R is resistance. In this case, the amplitude of the current remains the same and is http://www.ehow.com/how_6048464_calculate-current-...
 Amplitude:1:physics) the maximum displacement of a periodic wave; 2:the property of copious http://www.chacha.com/question/what-is-a-amplitude
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