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Microscopic origin of current in terms of electron drift.
Linear V–I relation; resistance depends on geometry and resistivity.
Combination rules for resistor networks.
Current law (KCL) and voltage law (KVL) for circuit analysis.
Distinction between EMF and terminal voltage under load.
Power dissipation in a resistor; kWh as the practical unit.
Capacitor charging/discharging through a resistor; the time constant τ = RC.