Edexcel IGCSE Physics 2.17 Current At Junctions Questions

Practise applying conservation of current at circuit junctions to deduce ammeter readings and total battery current in branching circuits.

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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