FunWhy does the phone keep working when the power...

Why does the phone keep working when the power goes out?

The telephone apparatus that we have at home is powered by a direct current provided by the telephone exchange of the corresponding area. If there is a power outage in our home, the phone continues to work, since it takes power from the telephone exchange , not from the general electricity supply. Furthermore, if the power outage affects the telephone exchange, accumulators located in the exchange itself come into service immediately, capable of providing the energy necessary to maintain the telephone service for a limited period of time.

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