Standard Science Primary 5 Systems

Stan sets up the circuit shown below. The bulbs are lit. If he adds one more battery in series, what will happen?

A The switch will automatically open.
B The bulbs will become dimmer.
C The bulbs will go out.
D The bulbs will become brighter.
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Worked Solution

Step 1: The circuit currently has one battery providing energy. Step 2: Adding a battery in series increases the total electrical energy (voltage) supplied to the circuit. Step 3: More electrical energy causes a larger current to flow through the filament, making the bulbs glow brighter.

Correct answer: The bulbs will become brighter.

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