Buzzing with Power: How Voltage Changes the Volume!
This week in Year 6, we became electrical investigators!
Our mission?
To discover how the voltage in a circuit affects the loudness of a buzzer — and the results were electrifying.
We began by setting up simple circuits using wires, batteries, and a small buzzer. Then, we experimented by changing the number of batteries (which changes the voltage). With each change, we listened closely to hear what happened.
What we discovered was exciting:
More voltage made the buzzer louder!
Less voltage made it quieter—or sometimes not buzz at all.
Lyra said, “I didn’t know adding one battery could make such a big difference.”
Tianna jumped, saying, “It's too loud- it made me jump.”
When the voltage was reduced, the buzzer became quieter, with one child commenting that it “sounded tired without enough power.” Others described it as “like giving the circuit extra energy to wake it up.”
Through careful listening and testing, pupils discovered that voltage acts like an electrical push: the stronger the push, the more energy the buzzer has to vibrate and make sound.
