We don't normally say that electrical items are "alive". I think you - and possibly some other comments - are getting mixed up with the word 'live'. The term "live" is used in connection with electrical circuits and individual appliances to describe a state in which electrical current is flowing.
Conversely, "dead" is commonly used to describe a state in which electrical current is not flowing through a circuit, or not correctly powering an appliance. We often say that individual appliances without any visible electrical connection are "dead".
If electricity was restored to an item previously declared 'dead', we'd probably just say it was "back on". However, that's not to say that "alive" couldn't be metaphorically in some way. We often personify vehicles, and I remember my friend would always say "she's alive!" when his beaten-up old car miraculously started.