5.1a Electric field and charge
5.1b Coulomb's Law
5.1c Electric field strength
5.1d Electric current
5.1e Electric potential
5.2a Circuit diagrams, ammeters and voltmeters
5.2b Resistance
5.2c Resistivity
5.2d Combining resistors
5.2e Potential dividers
5.2f Kirchhoff's Laws
5.3a Primary and secondary cells
5.3b Internal resistance
5.4a Magnetic fields
5.4b Charges in a magnetic field
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