Standard Science Primary 5 Systems

What happens when more batteries are added in series to a circuit with one bulb?

A The bulb will stay lit for a shorter time.
B The bulb will shine more brightly, or it may fuse.
C The bulb will shine less brightly.
D The direction of the current will reverse.
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Worked Solution

Step 1: Adding batteries in series increases the total electrical energy (voltage) supplied to the circuit. Step 2: More electrical energy causes the filament in the bulb to heat up more, producing more light (brighter). Step 3: However, if the current becomes too high, the filament may overheat and break (fuse).

Correct answer: The bulb will shine more brightly, or it may fuse.

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