RC Circuits! Lecture 15.

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Presentation transcript:

RC Circuits! Lecture 15

Announcements Exam on Thursday. Check the website Practice exam & solutions Seating chart Study hard!

RC Demo

Charging: Overview of the action.

Charging: Overview of the action. My capacitor heuristic: Small t (large ν) → C is a short circuit Large t (small ν) → C is an open circuit

Charging: Setting up the equations Kirchhoff Voltage Law:

Aside: Does current really flow through a capacitor? Current through 3 surface The current through the gap is always 0! “Current through the capacitor” = change in Q on plates

Aside: Does current really flow through a capacitor? “Current through the capacitor” = change in Q on plates

Charging: Setting up the equations Kirchhoff Voltage Law: Initial State:

Charging: Solving the equations Overhead.

Charging: Solution RC time constant:

Quick check of the units…. RC time constant units:

Discharging: Overview of the action.

Discharging: Setting up the equations Kirchhoff Voltage Law: Initial State:

Discharging: Solution RC time constant:

Energy flow in an RC circuit. Power: Energy stored: