Answer / kashish kalra

potential differnce is basically the the differnce between
the two points,
voltage drop is the amount of voltage spend to overcome
the impedance offered by any pasive components in an
electric circuit,
whereas emf is electromotive force ..which not actually a
force rather an amount of volatge which tends to flow a
certain amount of current in the circuit.

Answer / percy

VOLTAGEDROP AND POTENTIAL DIFFERENCE ARE SAME

BOTH R ACTUALLY THE DIFFERENCE IN POTENTIAL AT TWO POINTS

EMF OF POTENTIAL IS DEFINED AS THE FORCE REQUIRED TO BRING
UNIT "+'VE CHARGE FROM INFINITY TO A GIVEN POINT.

Answer / amolkarne

EMF : VOltage acrooss the source teminal when load is not
connected (Unit:Volt)

Voltage Drop: Drop in voltage due to current & resistance
(or impedence)in the circuit is nothing but Viltage Drop
(unit:Volt)

P.D.: Diff.in the potential (or voltage)of the two terminals
in the circuit is nothing but P.D

Answer / rahul babu

potential difference is basically difference in charge b/w
two points.as a positive test charge is bring from infinity
to a given point.
while voltage drop is amont of current dissipated by an
impedance or resistace

and emf is voltage generated in case of magnetic field..

is it necessary for 200 kva transformer to have marshaling box and cu plate earthing for neutral

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I have a 25kVA three phase transformer on our property. Will this transformer be large enough to run a large home with swimming pool, spa, 2 off full size reverse cycle air conditioners to service a 100 square house (10,000 square feet or 930 square metres)and the general power consumption of this house without upgrading to a 63kVA transformer.

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I hv a question regarding power factor improvement just after transformer. I request you to reply me plzz. thank you sir. My friend has a small unit of fabrication. in his factory the main load is a welding machine, lathe machine, grinding machine. this load is not continuous type. now our electricity board has installed 16 KVA, 11000/433 V transformer for our factory. In the energy meter (trivector meter) at LV side of transformer, i hv seen power factor value of 0.15 only when only 3 KW load was flowing. Further electricity board has suggested to install 4 KVAR capacitor at LV side after energy meter. Now my question is that if we permanantly install and switch on 4 KVAR capacitor after energy meter, during some load on transformer and also without any load on transformer, wht will be the power factor shown in energy meter?i dont want to get any penalty by electricity board, so plz suggest me if i can permanantly install and switch on the 4 kvar capacitor or not at LV side of transformer just after energy meter? Thank you again and awaiting for ur positive reply soon.

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Why the brushes used in dc machines are made of carbon not from other metal?

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