Edexcel IGCSE Physics 2.17 Current at junctions
Practise applying conservation of current at circuit junctions to deduce ammeter readings and total battery current in branching circuits.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
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
2.17 Current at junctions question 1
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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