Doorbell always uses electricity!
My best friend has degrees in electronics, electrial power and once
was a design engineer for at the time a major power transformer
manufacturer.
I asdked him about standby losses, he rreports it depends on ntheb
transformer. they can be built to be ultra low, which cost more, or
lossy and cheap to build.
government should require energy efficency numbers on everything with
minimum standards
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