Advanced Science Primary 6 Energy

A circuit has two bulbs in parallel, and this pair is connected in series to a third bulb. If the third bulb fuses, what happens to the two bulbs in parallel?

A Both bulbs will go out.
B They will both become brighter.
C Both bulbs will stay lit.
D One will stay lit, the other will go out.
Show Worked Solution

Worked Solution

Step 1: The third bulb is in series with the battery and the parallel branches. Step 2: A series connection means there is only one main path for current to exit/enter the battery. Step 3: If a series component fails, it creates an open circuit for the entire system.

Correct answer: Both bulbs will go out.

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