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Cambridge IGCSE Physics - electricity

IGCSE Physics electricity

Treat a circuit as a connected system, not a picture of components. Identify nodes and branches first, then apply charge conservation, energy transfer, component relationships, and safety reasoning at the correct part of the network.

Framework
Cambridge Physics 0625
Level
Cambridge IGCSE Physics Core and Extended
Guide format
Topic and circuit-skills guide

Start with the model

Topology first, equations second.

A node is a set of points connected by ideal wire; a branch joins two nodes through one or more components. Components in the same branch share current. Components connected across the same two nodes share potential difference. This connectivity test is more reliable than judging whether a diagram looks visually series or parallel.

Current tracks charge flow, potential difference tracks energy transferred per unit charge, and resistance describes the ratio between voltage and current under stated conditions. Power and electrical energy connect the circuit model to heating, cost, and safe operation. Keep each quantity's unit beside the calculation.

Study pathway

Four decisions that organize the topic.

Follow the sequence or open the step that matches your current gap. Destination pages keep their existing access rules.

  1. 01

    Trace nodes and branches

    Hide component details temporarily and identify the actual connectivity before naming series or parallel sections.

    Open this step
  2. 02

    Track charge and energy

    Use current at junctions and potential difference around loops as conservation statements.

    Open this step
  3. 03

    Read component behaviour

    Interpret current-voltage relationships instead of assuming every component has constant resistance.

    Open this step
  4. 04

    Connect power to safety

    Relate current, heating, fuse choice, insulation, earthing, and household electrical risk.

    Open this step

Use it deliberately

A circuit-solving workflow

Redraw complex-looking circuits by connectivity and keep a ledger of what is shared, split, or conserved.

  1. 01

    Mark each node with a letter and list the branches joining every pair of nodes.

  2. 02

    Label known current directions and voltage polarities consistently, even if a later negative result reverses them.

  3. 03

    Apply junction, loop, and component relationships separately before combining equations.

  4. 04

    Test limiting cases: an open branch, a very large resistance, or identical parallel branches should behave predictably.

Continue on GioPhysics

A mapped route, not a search-results wall.

Curriculum context on this page is public. Lessons, presentations, files, and practice follow the access message shown when you open them.

MapIGCSE electric-circuits directorySee electrical quantities, circuits, and safety in their syllabus order.DrawCircuit symbols and diagramsBuild correct schematics and reason from nodes and branches.MeasureCurrent and chargeConnect charge flow, current, time, and measurement placement.ProtectElectrical safetyApply fuse, earth, insulation, and power reasoning to real circuits.PractiseCircuit applicationsSolve electricity problems through graduated pathways.

Questions before you begin

Clear scope, honest expectations.

How can I tell if components are parallel?

They are parallel when both ends of each component connect to the same two nodes. Trace the wire connections; do not rely on how the drawing is arranged.

What is the difference between voltage and current?

Current is the rate of charge flow. Potential difference is energy transferred per unit charge between two points.

Why are electrical-safety questions part of circuit physics?

Safety devices respond to current, heating, insulation failure, and potential difference. The same circuit quantities explain why each protection method works.