Amplifiers are electronic devices that increase the magnitude of our voltage, current, and power signals by boosting an incoming signal. Amplifiers are essential components in many circuit systems for their ability to not only boost weak signals--but match impedance levels and provide amplification for audio output. Depending on their design, amplifiers can amplify any type of signal with varying degrees of fidelity.

The most common types of amplifier circuits are voltage amplifiers, current amplifiers, and power amplifiers. Voltage amplifiers modify the input signal to produce a larger but otherwise identical output voltage. Current amplifiers modify the input signal to create a higher output current. Power amplifiers modify the input signal to produce a higher power output without changing the voltage or current levels of the signal.

Where long distance signal transmission is desired, amplifiers are key. In radio broadcasting and telecommunications networks, amplifiers can help transmit strong signals over long distances.


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