power is the product of voltage and current.so we can
measure the value of power just by using ammeter and
voltmeter.......then why do we use a wattmeter?
- 5 Answers
- 7930 Views
- I also Faced
- E-Mail Answers
Answer Posted / gajanan
apperent power = voltage X current,
we can calculate apperent power by ammeter and voltmeter
reading but
real power = voltage X current X power factor
to measure real power we need wattmeter
| Is This Answer Correct ? | 24 Yes | 1 No |
Post New Answer View All Answers
What is magneto on a gas generator. how it functions. its out put is d.c or a.c. how it can be checked for correct functioning
what is accuracy ? in any meters , coils accuracy . how can u defined that ?
What are protections for dty type transformers
how to test the turn ratio of 3 phase transformer using volt meter shoe the curcit diagram.
plz send me HPCL apptitude paper.. maulik_elect@yahoo.co.in
what is the reason the main breaker is trip during the motor is running? (some time the breaker is not trip)
What is the effect on Power factor and capacitor when your company load is more than 70 % of welding transformer
what is W.T?specify the acceptable range?
details of oil cell size of Breakdown voltage test of tranformer oil details as per Standardswith mushroom electrodes?
what is meant by loss of field in a DC motor? how a universal motor works?
Why cables and busbar both needed in LT Panels?
Don't you have similar question banks related to Oral Certification Examination conducted by Mercantile Marine Departments / Directorate of Shipping, Ministry of Shipping for Electro Technical Officer?
What is the meaning of 40X8X2 busbar dimensions for carring load of 400 Amps
Why phase sequence must be same in any ht motor or generator circuit?if phase sequence doesn't same whatever will be affect on circuit?
RESPECCTED SIR/MADAM- I AM PRERING FOR SECTION ENGINEER (ELECTRICAL) RRB CHANDIGARH PLEASE SEND ME SOME PREVIOUS YEAR QUESTION PAPER OR MODEL PAPER.MY EXAM IS ON (30- NOVEMBER 2008).I AM VERY THANKFUL TO YOU. FROM- HARENDRA SINGH YADAV
