Electric buzzing or humming noises originating from household wiring devices, switches, outlets, or appliances are typically caused by electromagnetic induction or mechanical vibration. In alternating current circuits operating at 60 hertz, current flowing through transformer coils, magnetic ballasts, or loose switch terminals forces metallic components to vibrate rhythmically. Additionally, solid-state dimmer switches chopping AC waveforms cause LED drivers to hum. You can troubleshoot acoustic noise safely by listening closely to isolate the source. You can verify that your corrective action is successful when tightening loose terminal screw operators, replacing vibrating ballasts, or installing certified dimmable LED lamps eliminates the low-frequency drone completely.
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