Interested to Buy Any Domain ? << Click Here >> for more details...
In DC while we mention the voltage we are using -48V but in
case of AC we mention only 230V not -230V, why we using -48V
not 48V
- 2 Answers
- 4989 Views
- I also Faced
- E-Mail Answers
Answer Posted / cnu
in the measurement of voltage in any circuit we measure the
voltage of one conductor with respect to another.
In DC supply we have two conductors namely Positive(+) and
negative(-). if we consider 48V DC across the two
conductors, then if we measure the value on the positive
conductor with respect teo the negative conductor the value
is +48V. if we measure the same value on the negative
conductor with respect to the positive conductor then the
value will be -48V. this 48V is the instantaneous value of
the DC supply.
Where as in AC we have two conductors namely Phase and the
Neutral. always the Phase constitute the current path and
the neutral forms the return path. we say that the AC
voltage is sinusoidal. that is it varies from positive to
negative when seen with respect to the neutral.
its impossible to measure the instantaneous value of the AC
supply bcoz it keeps on continuosly varying. so for the AC
supply we consider the RMS value (Root Mean Square Value)
as the voltage of the supply. so in this case there is
always the same value when measured with respect to any
conductor. so the AC voltage does not have polarity.
| Is This Answer Correct ? | 10 Yes | 0 No |
Post New Answer View All Answers
If I want to connect a capacitor bank on the HT side of a 11kV/415V, 3 phase delta-star distribution transformer to supply Reactive power to it..what practical specifications of a Capacitor bank that can i've??please reply..
What is the best thing to protect the motor from running over full current. CT or O/L or pressure transducer at the given pressure rating
1. A bomber drops a bomb from an aircraft flying at 2000 km/hr. at an altitude of 7km. The speed at which the bomb will strike the earth would be
how ups works ? various parts of ups and working principle
how to find impedance , mutual indatnce in transmission lines
a 100mva,400/200v transformer has leakage impdce of 10% draws a steady state line currentof---------------
How can two 3 phase transformers of same KVA and Voltage be connected in parallel?
from which subjects most of the technical que will b asked for hpcl(electrical).pls help me
what is the maintaining Cf in UPS.
How to perform a DC resistance test In Alternator and their proceduces?
what is the difference between dry and wet type of 132kV terminations. which one is durable
Give details of your interested designation, the post you are interested to serve the company better and explain why you think you can serve the company better in such position if employed?
How we can calculate the consumption in kwh of motor on basis of kw @100% load, @50% load & @ no load.
hi friends how 3 phase converter functioning ?what is working principle of rotory phase converter ?
What are test values for an 63 KVA and 100 Kva Distribution Transformers for the following typical tests 1)Magnetic balance 2)Short circuit test 3)Open Circuit test 4)Vector group confirmation test .please give me the standard values for all the above tests.
