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Re: [Phys-L] Singing Kettle

It would be easy to rule out a thermostat or heat-sensitive electrical fault by monitoring the current.

-----Original Message-----
From: Phys-l <> On Behalf Of brian whatcott
Sent: Wednesday, October 24, 2018 2:58 PM
To: prefered phys-l address <>
Subject: [Phys-L] Singing Kettle

We use an electric water kettle, made by Hamilton Beach; its capacity is
1.7 liters, electrified through its fixed base plate supplying 1.5kilowatts. The
shape is a truncated parabola of revolution, focus up.
When half filled, it shows a distinct acoustic pattern when the heating
produces gas bubbles. The sound oscillates on a 10 second periodic time,
from silence to a quiet pink noise and back, never louder than 60 dBm. I
suppose there is a positive feedback loop of some kind.    Care to hazard a

Brian W

Forum for Physics Educators