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First order system vs second order system | Difference between First order system and second order system

This page compares first order system vs second order system and mentions difference between first order system and second order system. It mentions what is zero order system with example.

Zero Order System


In the system in which as input changes, output also changes immediately is called zero order system.

Example:
➨Resistor

First Order System

First Order System

Definition:
• In the system in which as input changes, output also changes but not immediately is called first order system.
• This system takes some delay but without oscillation.
• The figure-1 depicts circuit diagram of one such first order system.

Example:
➨Heater

Second Order System

Second Order System

Definition:
• In the system in which as input changes, output also changes but with some delay and oscillation is called second order system.
• The figure-2 depicts circuit diagram of one such second order system.
• Analog instruments are second order instrument which has damping factor (ξ) between 0.6 to 0.8. It is an underdamped system.



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