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100 SCIPAD - BIG IDEAS - BOOK 2
CIRCUITS AND MAGNETS
Voltage in a Series Circuit
Voltage is a measure of how much energy the current is carrying. The unit of voltage is the volt
(symbol: V). The voltage across an electrical component is measured using a voltmeter. The
voltmeter must be connected in parallel across the component.
In a series circuit the voltage is divided (shared) between the components. For example, if the
current is carrying 10 V and there are two bulbs of the same size, each bulb will use 5 V.
1. (a) Draw a series circuit containing a cell, and two bulbs with a voltmeter measuring
the voltage around one of the bulbs.
Solving Unknown Voltmeters in Series Circuits (assume all bulbs are identical)
(b) If the power supply is producing 10 V, what is
the reading on V1?
V1 =
(c) If the power supply is producing 10 V, how
much voltage is each bulb using?
V1 =
V2 =
(d) The power supply has changed.
V1 =
V2 =
V3 =
10V
V1
10V
V2 V1
12V
V2 V1
V3
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