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Charge and drift velocity, potential difference, Ohm’s law and I–V characteristics.
The resistivity equation, and how resistance depends on temperature and light.
Kirchhoff’s two laws, and the series and parallel resistance rules.
E.m.f., lost volts, terminal p.d. and the graphical method for finding ε and r.
The potential divider equation, and building sensor circuits with a thermistor or LDR.
Work through each topic to complete the section.