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On the syllabus: GCSE PhysicsA-Level Physics
Every wall socket in your home is connected in parallel — so plugging in a new device doesn't dim everything else. But the fuses protecting your house are wired in series — so if one blows, everything on that circuit dies. Same house, same wires, completely opposite connection logic. Why would engineers mix the two strategies in the same building?
Every wall socket in your home is connected in parallel — so plugging in a new device doesn't dim everything else. But the fuses protecting your house are wired in series — so if one blows, everything on that circuit dies. Same house, same wires, completely opposite connection logic. Why would engineers mix the two strategies in the same building?
The way you connect components in a circuit changes everything: the total resistance, current through each component, and voltage across each one. Getting this wrong in engineering can mean a fuse that never blows, a device that draws too much power, or a lighting system that fails completely when one component dies.
In a series circuit, components share the same current and their resistances add directly. In a parallel circuit, components share the same voltage and their reciprocal resistances add. These two rules govern every circuit from a flashlight to a microprocessor.
Why do household appliances run in parallel? Because each device gets the full mains voltage (230 V or 120 V), and failing devices don't kill the others. Series wiring would mean adding a kettle drops voltage across all other devices. Car circuits use parallel wiring for the same reason. However, series wiring is useful for current-limiting (LEDs always use a series resistor) and for voltage dividers, which are essential in sensor circuits and amplifiers.