Unit 5 Electricity and magnetism

Charge

Electric field

Coulomb’s law

Electric current

Direct current (dc)

Potential difference

Circuit diagrams

Kirchhoff’s circuit laws

Heating effect of current and its consequences

Resistance expressed as R = V / I

Ohm’s law

Resistivity

Power dissipation

Cells

Internal resistance

Secondary cells

Terminal potential difference

Electromotive force (emf)

Magnetic fields

Magnetic force

Identifying two forms of charge and the direction of the forces between them

Solving problems involving electric fields and Coulomb’s law

Calculating work done in an electric field in both joules and electronvolts

Identifying sign and nature of charge carriers in a metal

Identifying drift speed of charge carriers

Solving problems using the drift speed equation

Solving problems involving current, potential difference and charge

Drawing and interpreting circuit diagrams

Identifying ohmic and non-ohmic conductors through a consideration of the V/I characteristic graph

Solving problems involving potential difference, current, charge, Kirchhoff’s circuit laws, power, resistance and resistivity

Investigating combinations of resistors in parallel and series circuits

Describing ideal and non-ideal ammeters and voltmeters

Describing practical uses of potential divider circuits, including the advantages of a potential divider over a series resistor in controlling a simple circuit

Investigating one or more of the factors that affect resistance experimentally

Investigating practical electric cells (both primary and secondary)

Describing the discharge characteristic of a simple cell (variation of terminal potential difference with time)

Identifying the direction of current flow required to recharge a cell

Determining internal resistance experimentally

Solving problems involving emf, internal resistance and other electrical quantities

Determining the direction of force on a charge moving in a magnetic field

Determining the direction of force on a current-carrying conductor in a magnetic field

Sketching and interpreting magnetic field patterns

Determining the direction of the magnetic field based on current direction

Solving problems involving magnetic forces, fields, current and charges