With all the hairdryers on at the same time, there's a lot of current being drawn from the mains to supply the dryers. This has overloaded a circuit breaker/fuse somehwere in his system causing a power cut or safety reasons. He probably needs to get a qualified electrician in and get the wiring sorted out so that it can handle the electric current at peak demand, or schedule the demand so that the overload doesn't happen. If he's busy, then I'd go or the electrician option to keep things moving safely.
Muttered is the same thing like mumble.
It's like when you are speaking and no one couldn't hear what you said.
So Muttered is when you say something low .
An electron that is far away from the nucleus have higher energy than an electron near the nucleus. Nucleus are positively charged and those electrons near it get attracted; those electrons gain kinetic energy hence reducing their internal energy. The electrons far from nucleus have low kinetic energy hence more internal energy.
