Electrical Circuits and Symbols
Electrical circuits work because cells and batteries store chemical potential energy, which transfers energy to electrons flowing through wires. Think of it like a river system where energy flows from high to low potential.
You'll need to recognise standard circuit symbols: cells (+|-), batteries (+||-), switches openoo,closedo−o−, lamps (⊗), resistors (rectangle), and meters (A for ammeter, V for voltmeter).
Special components include LEDs light−emittingdiodes, variable resistors, LDRs light−dependentresistors, and thermistors. Each symbol represents a specific component with unique properties.
Study Tip: Draw circuits regularly to memorise symbols - they're essential for exam questions and practical work.