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Phone lines operate at 48 volts when you pick the phone up to make a call and while talking, but 90 volts are sent to the phone you are calling to make the phone ring. This is a holdover from the old rotary phones that had the bells that were struck by a little hammer.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoTypical on-hook voltage is 48 volts DC, off-hook voltage 12 to 16 volts DC and ringing voltage 90 volts AC at 20 hertz.
These voltages vary, depending on the actual standards implemented by the telephone system you are using, and also how far away you are from the telephone company's exchange or central office.
Wiki User
∙ 14y agoabout 4 volts - im nearly certain, but I dont remember the milliamps. hard answer to find online.
Wiki User
∙ 12y agoNormally 48 VDC when "on-hook", very low when a call is in progress,
and high AC ... like 150 VAC ... when ringing.
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A lemon produces about 7/10 of a volt of electricity.
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