A fan makes a hum because its motor is vibrating. When electricity flows through the wires, it makes the motor spin, and that spinning creates a sound we hear as a hum. It's like when you shake a bell, the faster you shake it, the louder it rings.
Examples
- Your fan makes a soft hum when it's running because its motor is working hard.
- A broken fan may make an even louder hum if the parts inside are misaligned or loose.
- Fans in old buildings often have a deeper, more rumbling hum than new ones.
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See also
- What Causes the ‘Rustle’ of a Blanket?
- What Causes the ‘Hum’ of a Refrigerator?
- What Causes the ‘Hum’ in a Refrigerator?
- What Causes the ‘Sound’ of a Bell and How Is It Different From a Drum?
- How Does Sound Travel Through the Ocean?
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