Turn on, turn off the appliance, low-frequency hum:
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Wall switch
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Electric transformer
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Electric discharges, Jacob’s ladder
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Multichannel switch
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Switch
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Current, electricity, discharge
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Shoots an electric arc indoors
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Low Frequency Electric Drone
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Low frequency rumble
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Electric discharges, Tesla coil
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Start up, Electronic energy, shutdown,
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Small switch, toggle switch
★★★★★