Why is it preferred to use a wattmeter(s) to measure power in three phase systems rather than using a combination of other instruments e.g. voltmeters, ammeters etc?

2 Answers  

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when we switch on the switch and load is not connected at home,is electricity wasted?

1 Answers  

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what does the transformer connection symbol YNaod1 mean ?

3 Answers  

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how we can calculate 2 phase welding transformer rating or total power?

0 Answers  

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If the Supply voltage is increased by n times, the cross section of conducter will [increase/decrease] by ________ times ?

4 Answers  

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what is the working principle of soft-starter & how it diff. from VFD ?????????

5 Answers   L&T,

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if the magnetic lines can pass through a vaccuum area

0 Answers  

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Difference between hopkinson and swinburne's test

1 Answers  

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what is the difference between ac motor and dc generator

0 Answers   ETA,

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what is the difference in inductance and resistance.both oppose the flow of current but how.resistance having + ve power in both cycle while inductance having both power.

5 Answers  

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Why we use Electrical energy rather than any other type of energy, mostly? Explain behavior of open secondary CT and short circuited secondary PT in energized condition?

0 Answers  

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why normally Generator rating are between 11Kv to 22Kv?

7 Answers   Torrent Power,

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