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RLC series circuit HTML5

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An RLC series circuit is powered by a sinusoidal voltage source of variable frequency vE(t)=VEcos(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 vR(t) observed on the oscilloscope is a reflection of the current. (vR(t)=Ri(t)). The amplitude reaches a maximum for a certain frequency, called the resonance frequency  f0. 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.


Learning goals

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


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For f=f0,  the voltage vR(t)=vE(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…

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