BRAINCAKEElectricity
Revision notes for Electricity in AQA Combined Science: Trilogy (8464). 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 circuit, two things are needed.
- Current, resistance and potential differenceThe current I through a component depends on two things: the potential difference (pd) V across it and its resistance R.
- ResistorsFor some resistors the resistance stays constant, and for others it changes as the current changes.
- Direct and alternating potential differenceA cell or battery gives a direct potential difference (dc).
- Mains electricityMost electrical appliances are connected to the mains by a three-core cable.
- PowerPower is the rate at which energy is transferred by a device.
- Energy transfers in everyday appliancesEveryday electrical appliances are designed to transfer energy.
- The National GridThe National Grid is a system of cables and transformers that links power stations to consumers.