Linear function:
No variable appears in the function to any power other than 1.
A periodic input produces no new frequencies in the output.
The function's first derivative is a number; second derivative is zero.
The graph of the function is a straight line.
Non-linear function:
A variable appears in the function to a power other than 1.
A periodic function at the input produces new frequencies in the output.
The function's first derivative is a function; second derivative is not zero.
The graph of the function is not a straight line.
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Linear system follows principal of superposition and homogeneity and Non linear system does not follow the same.
linear
It is linear.
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Linear elements :In an electric circuit, a linear element is an electrical element with a linear relationship between current andvoltage. Resistors are the most common example of a linear element; other examples include capacitors,inductors, and transformers.Nonlinear Elements :A nonlinear element is one which does not have a linear input/output relation. In a diode, for example, the current is a non-linear function of the voltage.Most semiconductor devices have non-linear characteristics.