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9 Electricity 9.1 Electric current Candidates should be able to: 1 understand that an electric current is a flow of charge carriers 2 understand that the charge on charge carriers is quantised 3 recall and use Q = It 4 use, for a current-carrying conductor, the expression I = Anvq, where n is the number density of charge carriers 9.2 Potential difference and power Candidates should be able to: 1 define the potential difference across a component as the energy transferred per unit charge 2 recall and use V = W / Q 3 recall and use P = VI, P = I 2R and P = V 2 / R 9.3 Resistance and resistivity Candidates should be able to: 1 define resistance 2 recall and use V = IR 3 sketch the I–V characteristics of a metallic conductor at constant temperature, a semiconductor diode and a filament lamp 4 explain that the resistance of a filament lamp increases as current increases
