Standard Science Primary 5 Systems

Siti set up a circuit with two bulbs and two batteries. She noticed that when she added a third battery in series, the bulbs became brighter. Why did this happen?

A The resistance in the circuit decreased.
B The batteries were connected in parallel.
C The amount of electric current flowing through the bulbs increased.
D The bulbs were connected in parallel.
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Worked Solution

Step 1: Identify the change (adding a battery in series). Step 2: Recall that more batteries in series increase the total voltage. Step 3: Higher voltage results in more current flowing through the bulbs. Step 4: More current makes the bulbs shine brighter.

Correct answer: The amount of electric current flowing through the bulbs increased.

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