Edexcel IGCSE Physics 2.17 Current At Junctions Questions

Current entering a junction equals current leaving it. Use this conservation rule to find unknown branch or supply currents in circuit diagrams.

Exam points

add branch currents at a junction to calculate the total current through the battery
deduce labelled ammeter readings by matching current into and out of a junction

[Maximum number: 2]

The diagram shows a domestic lighting circuit.

The circuit is connected to the mains supply. Mains voltage is 230 V .

Switches 1 and 3 are closed, which turn on lamps 1 and 3.

Switch 2 is open.
Calculate the current in the mains supply.

current = ............ mA

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