# What is Decibels?Decibel measurement and decibel levels chart

To show a signal loss or gained strength, the scientist used the unit called decibel(dB)

A decibel value in, strictly speaking, it is a ratio b/w two values

A bel is named after Alexander Graham Bell

Remember: if the decibel value is negative then the signal lost its strength similarly if the decibel value is positive then the signal got amplified or strengthened

Decibels definition: decibel  is a meter to express a ratio b/w two signals power ( and )

dB= deci-Bel

bel=

A deci-bel (dB) is one-tenth of a bel

Where is the output power and is the input power

#### Decibel measurement

Consider a signal is passed through an amplifier with power 10 w  and received 20w power as output calculate whether it is gain or loss of signal strength

Consider a signal is passed through a transmission medium (cable)  with power 20 w  and received 10w power as output calculate whether it is gain or loss of signal strength

#### decibel levels chart

Units of sound intensity : the intensity  of sound can be expressed as power per unit area(Watts/)

### Mohammed Anees

Hey there, welcome to aneescraftsmanship I’m Mohammed Anees an independent developer/blogger.