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To power electronics within to run tone bleepers,displays,amplifiers and memories.

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Q: Why do ordinary telephones need batteries?
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Related questions

How common are batteries used as a source of electricity?

Batteries are used now more so that ever. All of the hand held controllers, telephones, game consoles, portable radios all need batteries for their source of electricity.


Why are modern telephones called cell phones?

Because they run on cell batteries


Why are rechargeable batteries better than ordinary batteries?

Because you can use them multiple times.


What is the difference between cellular telephones and cordless telephones?

Cellular Telephones is using the Integrated Services Digital Network ISDN while the Cordless Telephone is using the Public Switched Telephone Network PSTN, same with ordinary telephone.


The center electrode post of ordinary flashlight batteries?

Brass


What element is the center of electrode post of ordinary flashlight batteries?

brass


Is there a cassette player with rechargable batteries?

Yes there are cassette player with rechargeable batteries. Even if you buy cassette player that runs on ordinary batteries, you can just replace it with rechargeable ones.


How should batteries be disposed?

Batteries be should not be disposed with ordinary trash due to their flammable nature. They should go with the hazardous waste for recycling.


Where do you get camera batteries?

For ordinary camera batteries, try the camera department of a big store such as Target or WalMart. For proprietary batteries (special batteries for specific cameras) try a camera shop or B&H PhotoVideo online.


Why do wireless telephones sometimes have interference?

Wireless telephones sometimes have interference due to low batteries or the base units being kept too close together. Contrary to popular belief, WiFi works on a different frequency and does not interfere.


What element makes up the center electrode post of ordinary flashlight batteries?

carbon


Does solar power need batteries?

no, it does not need batteries because it is powered by the sun.