15–18% of the AP exam. Key topics: Ohm's law (V = IR) and resistance, Series and parallel resistor circuits, Equivalent resistance (series: R_eq = R₁ + R₂; parallel: 1/R_eq = 1/R₁ + 1/R₂), Kirchhoff's current rule (junction rule), Kirchhoff's voltage rule (loop rule), Power dissipation (P = IV = I²R = V²/R), Capacitors in circuits: charge, voltage, and energy, RC circuits: charging and discharging behavior (exponential transients, time constant τ = RC), Voltmeters and ammeters: ideal behavior and placement in circuits, Internal resistance of batteries.
Study guide content for this unit is being prepared. Check back soon for complete lesson notes, formula sheets, and worked examples.
