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The line current used in a telephone system is DC. The actual line voltage used depends on the particular make and type of telephone system.
The voltage is supplied by Hugh batteries which are kept fully charged most of the time, except, of course when there is a general power outage. If an outage goes on for more than a short time, most telephone companies in developed contries have standby generators - running on diesel or petrol - to ensure their batteries stay charged-up.
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoAny audio signal has to contain varying sound frequencies, which are a form of ac.
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Is clock pulse an ac or DC signal?
It is called ( pulsed DC ).
What is the difference between in ac and dc powwer cable?
There is no difference in the cables. The only difference is the type of electrical power being transmitted. AC or DC applications use the same wires.
Why signal generator is not used in half wave rectifier?
one is AC the other is DC
Can an ac amplifier amplify the DC signals?
An amplifier generally amplifies an AC waveform (such as sound), and is powered by a DC source. The majority of the power at the output is then coming from a DC source (the power supply in a power amplifier will convert the 50/60Hz AC power in to DC for the amplifier circuitry). So you can make the argument the above (question) is a true statement. But an amplifier wouldn't be used to convert from DC to AC power (in general).
What are the application of peak detector?
to detect maximum peak os AC signal and convert to DC signal
Is signal ac or dc?
ac
Why is AC better than DC?
AC power can be transmitted more efficiently than DC.
Is clock pulse an ac or DC signal?
It is called ( pulsed DC ).
How do you conver ac power into pulsating DC What devices you need?
rectifier circuit convert ac to dc signal
What will happen when a single diode is connected to a transformer with ac signal?
it convert ac signal into dc signal But it will give only half-wave rectification.
What is the operation of a rectifier?
The operation of a rectifier is to conver a AC signal to a pulsating DC signal
Why amplification of ac signal is easier than a dc signal?
The Amplification is much high during acmode because of transister conducts boththe Half cycles.But in DC the transister conducts only in positive half cycles.So the Amplification of AC signal greater than DC signal.
When you short two wires of 24V dc there is no sparking in telephone lines why?
because it dc not ac
What will happen to the output ac signal if the dc level is insufficient?
What will happen to the output ac signal if the dc level is insufficient? Sketch the effect on the waveform.
What type of signal to amplify by using differential amplifier?
ac and dc
What is the difference between in ac and dc powwer cable?
There is no difference in the cables. The only difference is the type of electrical power being transmitted. AC or DC applications use the same wires.
What is perhaps the single most important advantage of using AC compared to dc current?
AC current can be transmitted with less loss
