# Linear Circuit **A circuit whose output voltage and current are linear functions of its input voltage and current.** A **linear circuit** is a circuit which has a *linear relationship* between its output and input voltage and current. A circuit is also linear if it follows the [[superposition]] principle. Linear circuits consist of components whose values *do not* change depending on the voltages and current in the circuit. This property is known as being *linear time-invariant*. Examples of *linear components* are - Ideal resistors, [[Capacitor|capacitors]], [[Inductor|inductors]] - Ideal non-saturated operational amplifiers - Amplifiers - Differentiators - Integrators - Linear electronic filters