What is the definition of amplifier?

Answer 1

If you are speaking of the radio amplifier, it takes the low powered signals from the radio and increases them for output to the speakers. Amplifiers usually have some provision or internal programming for splitting the signal so lower frequencies go to subwoofer and midbass speakers while higher frequencies go to tweeters.

Answer 2

The phrase 'power amplifier' is probably most commonly used in the field of audio amplification to describe the high power amplifiers that directly drive loudspeakers (but power amps are used in many appplications). Significant power is required to convert electrical signals into movement of the speaker cones, particularly when high volume sound is required, ie. outdoor concerts.

Typically a power amplifier is capable of driving very large currents into low impedance loads (often 2 Ohms or less) with voltages that can be higher than 100 Volts AC.

Compare this with a 'voltage amplifier' such as a small signal audio amplifier. In this case the amplifier might feed a high impedance input (an op-amp) and therefore deliver virtually no power to the op-amp, as only tiny currents flow. A power amplifier will typically deliver both high current and high voltage.

Answer 3

An amplifier is a device which increases the intensity of a mechanical wave. For example, if u talk about sound amplifiers, they increase the intenstiy of sound waves by which we can hear them aloud. Amplifiers are also used in communication systems (as modulators) to increase the intensity of the wave transmitted.

Answer 4

musicwhich is not amplifiea and which can be heared outdoors

Answer 5

The definition of amplify is to make larger, greater, or stronger.