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  

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what is LA CT PT panel?

3 Answers   Dwarikesh Sugar Industries, NTPC,

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what is stiffness factor

2 Answers   NTPC, Power Plant,

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what is a tri vector meter? what are the tri vectors?

2 Answers  

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In India the supply voltage is 230 volt A.C. During the negative half cycle phase becomes neutral and neutral become phase? or what will happen during negative half cycle? how the electrons flow during positive and negative half cycle?

0 Answers   ITI,

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what is cable meggering formula for low voltage ?

0 Answers  

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What is the criteria for deciding whther fire wall is required between two power transformers

1 Answers  

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how many joint can done in HT line and what is life of the joint

0 Answers   Micro Labs, Reliance,

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How to Prepare preventive maintenance shedule of machine tool.

0 Answers   Concast,

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when an induction motor runs on load.at that time if we reduce the supply voltage the current increases.But when it runs without load,if we reduce the supply voltage the current also reduced.why?.i checked it practically also.

1 Answers   Birla,

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if any house we instaled a 1.5 ton ac and its phase cable of wiring is installed but netrual cable of wiring not instaed. my question is that is neutual of house(for other wiring is capable for ac load or a sepeart neutrual wiring required

0 Answers  

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1 no. 22 kV feeder is taken from state electricity board. 350 MVA is the S.C. MVA. now i am feeding this feeder to HT Panel having 2 outgoings which further supply to 2 Transformers. Can you please suggest me the type & rating of cables are 3 of these cables same? or they are different? please help...............

2 Answers   TCE,

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