## Lecture (40 minutes)

Use this lecture as a time for students to connect their lab measurements to the derivation of the response of the series LCR circuit to a sinusoidal driving force. Introduce phasor notation (only the word “phasor” is new - the Argand representation is not). Introduce the words admittance and impedance to describe the response. Consider impedance and addmittance as complex quantities that contain information about amplitude and phase. Discuss resonance and $Q$. Discuss high- and low- frequency limits of the response.

This is a time for students to ask many questions - many ideas come together in this time, and except for the discussion of $Q$, which is new, it is a good time to field questions and allow the students to make sense of their measurements.

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