Page 102 - Big Ideas Year 10 sciPAD 2025

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102 SCIPAD - BIG IDEAS - BOOK 2
CIRCUITS AND MAGNETS
Voltage in a Parallel Circuit
In a parallel circuit, the current has more than one branch to follow. As it follows each branch it still
carries the same amount of voltage it was supplied with (the voltage doesn’t split like the current).
1. (a) Draw a parallel circuit containing a cell, and two bulbs with a voltmeter measuring
the voltage across one of the bulbs.
V2
V1
5V
V1
9V
Solving Unknown Voltmeters in Parallel Circuits (assume all bulbs are identical)
(b) If the power supply is producing 5 V, what
are the voltmeters reading?
V1 =
V2 =
(i) If one of the bulbs failed, would the
other bulb still glow?
(ii) Would the bulb failing change the
voltage supplied to the second bulb?
(c) If the power supply is producing 9 V, what is
the reading on the voltmeter?
V1 =
Will all the bulbs be the same brightness?
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