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An RLC series circuit is powered by a sinusoidal voltage source of variable frequency v_{E}(t)=V_{E}cos(2πft). The current i(t)is the same throughout the circuit. It is, like the entry voltage, sinusoidal but its amplitude and phase depend on the frequency: i(t)=Icos(2πft+φ)

The voltage v_{R}(t) observed on the oscilloscope is a reflection of the current. (v_{R}(t)=Ri(t)). The amplitude reaches a maximum for a certain frequency, called the resonance frequency f_{0}. It depends only on L and C.

**Click **and **drag** the slider to change the values of R, L, C and f.

**Click** on “cursors” to make measurements of phase differences.

- To study the harmonic response of a second order circuit.
- To illustrate the influence of different parameters on the form of the response.

For f=f_{0, }the voltage v_{R}(t)=v_{E}(t) of the RLC circuit acts like a simple resistance of value R. (Z = R).

The resonance in the current is more or less pronounced according to the value of R. The…