BRAINCAKEElectricity
Revision notes for Electricity in AQA Physics (8463). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.
- Standard circuit diagram symbolsCircuit diagrams use standard symbols so that anyone can read them.
- Electrical charge and currentFor electrical charge to flow through a closed circuit, the circuit must include a source of potential difference, such as a cell or a battery.
- Current, resistance and potential differenceThe current through a component depends on two things: the potential difference across it and its resistance.
- ResistorsFor some components the resistance stays constant, and for others it changes.
- Direct and alternating potential differenceA cell or battery gives a direct potential difference.
- Mains electricityMost electrical appliances are connected to the mains using a three-core cable.
- PowerPower is the rate at which energy is transferred.
- Energy transfers in everyday appliancesEveryday appliances are designed to bring about useful energy transfers.
- The National GridThe National Grid is a system of cables and transformers that links power stations to consumers.
- Static chargeWhen certain insulating materials are rubbed against each other, they become electrically charged.
- Electric fieldsA charged object creates an electric field around itself.