Standard Science Primary 5 Systems

Study the two circuits below. Both circuits use identical batteries and bulbs. Which statement about the bulbs is correct?

A Bulbs in both circuits have the same brightness.
B Bulbs in Circuit P are brighter than bulbs in Circuit Q.
C Bulb B1 is the brightest among all bulbs.
D Bulbs in Circuit Q are brighter than bulbs in Circuit P.
Show Worked Solution

Worked Solution

Step 1: Identify the arrangements: Circuit P is a series circuit; Circuit Q is a parallel circuit. Step 2: In a series circuit, bulbs share the electrical energy, making them dimmer as more bulbs are added. Step 3: In a parallel circuit, each bulb is connected directly across the battery, receiving the full electrical energy. Step 4: Therefore, bulbs in parallel (Circuit Q) are brighter than bulbs in series (Circuit P).

Correct answer: Bulbs in Circuit Q are brighter than bulbs in Circuit P.

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