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Why does your Sharp microwave make a low humming noise when it is not in use?
Wiki User
∙ 10y ago
A microwave oven is always switched on, even when it isn't cooking anything. It needs to be in order to recognize your commands and to have a clock. This means that there is a power transformer, and if the transformer laminations are slightly loose, they will vibrate in response to the 60 Hz magnetic field. That means that you will hear a 60 Hz or 120 Hz hum. If your power supply is some other frequency, like 50 Hz, you will hear a 50 Hz or 199 Hz hum. An expensive encapsulated transformer would fix this.
Wiki User
∙ 10y ago
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