Electronics/Expanded Edition DC circuits

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Resistance
Ohm's law, resistivity and conductivity

Capacitance
Some formulae for capacitance of different shapes, dependence on dielectric constant, units

Batteries
Behaviour in circuits

Solving circuits
Kirchoff's laws, Thévenin's theorem

Hall effect, Piezoelectricity, etc
Voltages induced by magnetic fields, stress, temperature difference, etc.