13. Electrical Systems
explain what is meant by current, potential difference and resistance of an electrical system, stating their units
draw and interpret circuit diagrams and set up circuits containing electrical sources, switches, lamps, resistors (fixed and variable), ammeters and voltmeters
*explain how arrangement of the components of an electrical system affects the outputs of the system (e.g. how series or parallel arrangement of resistors affects the brightness of the bulb)
explain qualitatively the chemical, heating and magnetic effects of an electric current and list some applications
explain what is meant by power, relate it to an output of an electrical system and state its S.I. unit
state how changes made to an electrical system can cause some electrical hazards
state some precautionary measures to