Standard Science Primary 5 Systems

Which of the following will result in a dimmer bulb in a series circuit?

A Replacing a plastic wire with a copper wire.
B Adding another identical bulb in series.
C Using a shorter wire.
D Adding another battery in series.
Show Worked Solution

Worked Solution

Step 1: In a series circuit, bulbs share the voltage of the batteries. Step [2-9]: Adding more bulbs increases the total resistance. Step [2-9]: Less current flows through each bulb, making them dimmer.

Correct answer: Adding another identical bulb in series.

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