Page 96 - Big Ideas Year 10 sciPAD 2025

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96 SCIPAD - BIG IDEAS - BOOK 2
CIRCUITS AND MAGNETS
Current in a Series Circuit
The flow of electrons in a circuit is called a current. Current is measured using an ammeter, a device
that is connected in series when added to a circuit. The unit of current is the amp (symbol: A). In a
series circuit the current is the same at all locations within that circuit.
1. (a) Draw a circuit containing a cell, and two bulbs with an ammeter measuring the
current flowing between the two bulbs.
Solving Unknown Ammeter Readings in Series Circuits
A1 5A
A2 5A
A1
A2
4A A1
A3
A2
8A A1
(b) If an ammeter in this circuit is reading 5 A, what
would be the reading on the ammeter labelled A1?
A1 =
(c) If an ammeter in this circuit is reading 5 A, what
would be the reading on the other ammeters?
A1 =
A2 =
(d) Solve the unknown ammeters.
A1 =
A2 =
A3 =
(e) Solve the unknown ammeters.
A1 =
A2 =
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