In a d.c current, the power is the product of voltage and
current. This relationship does not always apply to
effective(r.m.s) values in an a.c circuit. Explain the
reason for this.
Answers were Sorted based on User's Feedback
Answer / prosenjit majumder
In a DC circuit the power is the product of current and
voltage . Because in a DC circuit current and voltag
waveform always in a same phase . But in a AC circuit the
current and voltage may not be always in same phase .
Depending upon load (either inductive or capacitive ),
current and voltage waveform varies from each other. If
load is resistive then power is denoted by watt. If load is
capacitive or inductive then it is denoted by va .Here
power factor does matter .
| Is This Answer Correct ? | 5 Yes | 4 No |
Answer / loki
in dc average values of voltage and currents are always
constant.in ac instantaneous values differ from time to
time so we will take rms values
| Is This Answer Correct ? | 0 Yes | 1 No |
How does frequency affect KVA rating of a transformer? If a 500 kva, 500 to 250 v, 60 hz t/f normally used in Canada is to be operated in Europe on 50 hz frequency then how will its KVA rating change? a-increase b-decrease c-remains same
How will be the single line diagram of series trip HT breaker? how it works?
why we use ac?why we use dc? why we we cannot use only ac/dc for all the applications?what happen if we use?
-What is leakage current . how much leakage current is allowed.
Why no-load primary current is very small as compared to full load current in transformer (as 1% of full load current?
How to calculate the KA rating for a circuit breaker if we know the KVA rating of the generator feeding it?
if a 3phase motor runnig in star delta starter with full load of its,and its rated 15 amps.now we conneted over load thermal relay at its main contactor,here what will be our amps sittings?
xplain in detail d pr. of synchronous motors? why syn. generators r used for the production of electricity?
Where can I get Iidian straderd specifications for electrical items or works in web? please help me.
why should the lowest unit of a testing transformer ( cascaded transformer ) have higher power rating??
What is the difference b/w fanuc alpha series 16i and 18i controller. what is stand for i
Cummins 750 KVA generator how much disel consumed per hour and how many units generated on 100% full load.
Civil Engineering (5086)
Mechanical Engineering (4453)
Electrical Engineering (16638)
Electronics Communications (3918)
Chemical Engineering (1095)
Aeronautical Engineering (239)
Bio Engineering (96)
Metallurgy (361)
Industrial Engineering (259)
Instrumentation (3014)
Automobile Engineering (332)
Mechatronics Engineering (97)
Marine Engineering (124)
Power Plant Engineering (172)
Textile Engineering (575)
Production Engineering (25)
Satellite Systems Engineering (106)
Engineering AllOther (1379)