What happens to voltage when current is zero?

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When a single pase capacitor run motor- run on 230vac and Case(1)run with 8 Mfd 250 vac.capacitor , Case( 2) run with 8 Mfd 400vac capacitor. What is difference between both case regarding power ,efficiency etc?

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Why the underground cables will Punchar? or what is the reason to burst the underground cables?

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If we have two nodes A and B and Vab is the potential difference between these nodes then which node is called reference node a.node A b.node B c. Ground node

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I have a one P.F meter in my factory showing 2 phase leading and one phase lagging then what is my actual P.F.

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what composit error,ratio error,phase error in CT and PT??

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how to select fuse rating for a 3-phase motor ???

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Define conversion efficiency of a power amplifier.

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The capacity of the transformer is 20/25 MVA, Ratio is 132/11 KV, Vactor group YNyno. and impedance is 10.07%. As per the calculation the secondary current is 1312.2Amps. The maximum fault current the transformer should sustain is 13.030KA. How many times the transformer should sustain the maximum short circuit current of 13.030KA over a period up 1 Year. The transformer is repaired one & 10 Years old.

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why voltage will come different in phase?

3 Answers   HP, Vissa,

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Dear all, I'm manikandan I have done by DIPLOMA EEE from 2011 , I have 5 years of experience from Power plant instrumentation field , which one field is give long life & which one field is best ,I confused a lot and also I'm studying AMIE, can I choose which department from Section B examination? pls tell me

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is emf is indued if dc is passed through coil

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