Electricity is one of the largest topics in IGCSE Physics, covering everything from basic circuit components to the behaviour of current in series and parallel circuits, making it essential to build strong foundational knowledge early.
1. Understanding Electric Current
Electric current is the rate of flow of electric charge, measured in amperes (A), and it flows through a complete circuit from the negative to the positive terminal of the conventional current model used in most diagrams.
2. Series Circuits
In a series circuit, components are connected in a single loop, so the same current flows through every component, and if one component fails, the entire circuit breaks. Total resistance in a series circuit is the sum of all individual resistances.
3. Parallel Circuits
In a parallel circuit, components are connected across multiple branches, so voltage is the same across each branch while current can differ depending on the resistance of each path. Parallel circuits continue working even if one branch is broken.
4. Common Circuit Symbols
IGCSE students must be able to draw and recognise standard circuit symbols including cells, resistors, switches, ammeters, voltmeters and bulbs, since circuit diagram questions are common across every exam session.
Frequently Asked Questions
What is the difference between series and parallel circuits?
In a series circuit, current flows through one path and is the same everywhere, while in a parallel circuit, current can take multiple paths and voltage is the same across each branch.
What instrument measures electric current?
Electric current is measured using an ammeter, which is always connected in series within a circuit.
Conclusion
Mastering circuit diagrams and the rules for series and parallel connections provides a strong foundation for the more advanced electricity topics that follow in the syllabus.