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Microscopic origin of current in terms of electron drift.
Linear V–I relation; resistance depends on geometry and resistivity.
Linear approximation R = R₀(1 + αΔT) and the colour code.
Combination rules for resistor networks.
Power dissipation in a resistor; kWh as the practical unit.
Live/neutral/earth wiring, fuses and MCBs, and computing your bill in kWh.
Force on a current segment and torque on a current loop.
Conversion of electrical to mechanical energy via torque on a loop.
Rate of change of flux equals induced EMF.
Voltage ratio equals turns ratio; rationale for high-V transmission.