what is the current flow from telephone when call is made?

Question Posted / nirali

4 Answers
5881 Views
Matrix, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

what is the current flow from telephone when call is made?..

Answer / shakti

4 ma

Is This Answer Correct ?

4 Yes

3 No

what is the current flow from telephone when call is made?..

Answer / sparkindia

when telephone is in on hook condition (in idle
condition):voltage:-48v(minus voltage is used only for
protection purpose)

current: less than 5 micro Amp (idle
0 amp)
when telephone is in off hook condition (in use condition):
voltage:Between- 9V to- 3V

current: 20 mA to 30 mA

Resistance of telephone circuit (like our bsnl telephone)
is 200ohms.But it can vary as per manufacturer.
When telephone is ringing:Ringer voltage:90V AC

90V AC Ringer voltage is superimposed on 48V DC.

above data is calculated for telephone lines having
distance of almost 4.5 km between home and telephone
exchange which is generally used.

Is This Answer Correct ?

0 Yes

0 No

what is the current flow from telephone when call is made?..

Answer / noddy

4miliampere

Is This Answer Correct ?

0 Yes

0 No

what is the current flow from telephone when call is made?..

Answer / ramesh

I think 12V DC

Is This Answer Correct ?

0 Yes

8 No

Post New Answer

More Electronics Communications Interview Questions

Hr round and technical

0 Answers Hindalco,

Name the type of AM used in TV picture transmission?why it is used.

2 Answers

what is meant by 8.0.4 in TEMS 8.0.4?

0 Answers

Tell me something about IN call Flow and what is the difference between the flows in both GSM and CDMA technologies?

0 Answers Huawei,

A noiseless 8kHz channel is sampled every 1msec. What is the maximum data rate?

1 Answers Chongqing University of Posts and Telecommunications,

i done m.e communication system degree. i like to study new degree. which course is to choose. i selected m.sc applied psychology, m.sc e&i. is this suitable for me or say some suggestion to do some course.

0 Answers

BTS

2 Answers

What is mean by R, Y, B, Bk in wiring???

1 Answers

Sir,I have two years year gapping after the completetion of my 10+2.Then i had studied 1 year chemistry(hons)and had sat for part1 chemistry(Hons) exam..I got 60% in Hons also.I had sat Hons and Enginering Joint entrance exam together in the same year of 2008..But i got better opportunity and I switched to ECE..Sir,may i eligible to sit exams and interviews for any IT company,software technologies,consultancy company,electronics core company..??..thanks...

0 Answers

Tell me what are the components has to be done in fpga board (altera)?

0 Answers

How many types of transformers are there? How does it works?

11 Answers ONGC, Shine Construction,

what is lumped and distributed elements?

16 Answers Tech Mahindra,

For more Electronics Communications Interview Questions Click Here