Standard Science Primary 5 Systems

Luke has a circuit with one bulb and one battery. He adds two more identical batteries in series. What is the most likely result?

A The bulb becomes dimmer.
B The bulb does not light up at all.
C The bulb flashes on and off.
D The bulb becomes brighter or its filament melts.
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Worked Solution

Step 1: Adding batteries in series increases the total voltage (electrical push) in the circuit. Step 2: More electrical energy flows through the bulb's filament. Step 3: This makes the bulb glow brighter. However, if the current is too strong, the excess heat can cause the filament to melt (fuse).

Correct answer: The bulb becomes brighter or its filament melts.

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