Page 98 - Big Ideas Year 10 sciPAD 2025

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98 SCIPAD - BIG IDEAS - BOOK 2
CIRCUITS AND MAGNETS
Current in Parallel Circuits
In a parallel circuit, the current has more than one branch to follow. As a result, the current is
shared out among the branches. The sum of the current in the branches is equal to the current in
the main part of the circuit.
1. (a) Draw a circuit containing a cell and two bulbs in parallel with each other, and two
ammeters in positions where one can measure the total current, and the other, the
current in one of the branches.
Solving Unknown Ammeter Readings in Parallel Circuits.
(b) If an ammeter in this circuit is reading 4 A, what would
be the reading on the ammeters labelled A1 and A2?
A1 =
A2 =
(c) Assuming the bulbs are the same size, what would
the reading on the ammeters labelled A1 and A2?
A1 =
A2 =
(d) Solve the unknown ammeters. The bulbs are different
sizes.
A1 =
A2 =
(e) Solve the unknown ammeters. The bulbs are the same
size.
A1 =
A2 =
A3 =
A1
4A
A2
A1
3A
A2
A1
3A
A2
5A
A1
A2
9A A3
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