Electric currents Electric potential[] difference, current and resistance. Electric potential[] difference. 5.1.1 Define electric potential[] difference. 5.1.2 Determine the change in potential energy[] when a charge moves between two points at different potentials. 5.1.3 Define the electronvolt. 5.1.4 Solve problems involving electric potential[] difference. Electric current and resistance. 5.1.5 Define electric current. 5.1.6 Define resistance. 5.1.7 Apply the equation for resistance[] in the form R = ρL/A where ρ is the resistivity[] of the material of the resistor. 5.1.8 State Ohms law. 5.1.9 Compare ohmic and non-ohmic behaviour. 5.1.10 Derive and apply expressions for electrical power[] dissipation in resistors. 5.1.11 Solve problems involving potential difference, current and resistance. Electric circuits. 5.2.1 Define electromotive force (emf). 5.2.2 Describe the concept of internal resistance[]. 5.2.3 Apply the equations for resistors in series and in parallel. 5.2.4 Draw cricuit diagrams. 5.2.5 Describe the use of ideal ammeters and ideal voltmeters. 5.2.6 Describe a potential divider. 5.2.7 Explain the use of sensors in potential divider[] circuits[]. 5.2.8 Solve problems involving electric circuits[].