# Dictionary:Linear system

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{{#category_index:L|linear system}}
**1**. A system whose output is linearly related to its input. If a linear system is excited by a sine wave of frequency *f*_{1}, the output will contain only the frequency *f*_{1}; the amplitude and phase may be changed, however. The **rule of scaling** (if *A* results in *B*, then *kA* results in *kB, k* being any constant) and the **rule of superposition** (if *A* results in *B* and *C* results in *D*, then *A*+*C* results in *B*+*D*) apply. **2**. An electrical circuit whose impedance is independent of applied voltage (or current).