2 Electricity ############# Current, potential difference and resistance ******************************************** Standard circuit diagram symbols ================================ Fluff Electrical charge and current ============================= Fluff Current, resistance and potential difference ============================================ Fluff Resistors ========= Fluff Series and parallel circuits **************************** Domestic uses and safety ************************ Direct and alternating potential difference =========================================== Fluff Mains electricity ================= Fluff Energy transfers **************** Power ===== Fluff Energy transfers in everyday appliances ======================================= Fluff The National Grid ================= Fluff