One of the relative miracles of New times is the reliability of thephonesystem . The might go out fairly often for most masses . Sometimes it is only out for a second , but other times it can be out for minutes , hours or even day . Your telephony , on the other deal , is always working ( as long as you yield the banknote ) . Why is that ?
The articleHow Telephones Worktalks about the simplicity of phones and the telephony connection . The article shows you how , with just a 9 - voltbatteryand a resistor , you may make your own intercom system using two normal telephones . A phone will work as long as it is get between 6 and 12 volts at about 30 milliamps . In other words , it takes very little power to operate a telephone .
Between your house and the phone company ’s office there is adedicatedpair of copper telegram for your phone . Those conducting wire are almost alwaysburied , so ice storms and hurricanes will not cut them . The phone company supply the power that your phone need using your dedicated copper pair .
So even if the power goes out in your house , the phone still gets the power it needs through the phone line . And at the phone companionship office there is an across-the-board electric battery system of rules , as well as a backup generator , tosupply powerduring a power failure . If the tycoon goes out , the batteries and generators keep the office amply powered . Therefore , all of the phone connected to the office are to the full powered as well .
