An electrical network may be represented by a rectangular block having pairs of terminals.
Each pair of terminals is called a port. A pair of terminals at which signal enters is called a port.
Similarly, a pair of terminals through which signal leaves is called another port. In a two-port
network, signal enters the input port and after getting processed come out at the other port. For
example, consider a Public Address System (PA system). The system comprises a microphone,
an amplifier and a loud speaker. The audio-amplifier receives through the microphone signals
and sends the amplified signals through ...
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