The power of the  wre having potential difference 200 V across its end is 100 W.If the wire is cut into two equal parts,then what will be  the energy per sec  consumed by the wire.

Asked by kharendra | 10th Jul, 2015, 11:28: PM

Expert Answer:

The initial power of the wire is 100 W.
 
Now, when the wire is cut into two equal parts, its resistance as well as voltage drop both are equal and reduced to half the original values.
 
That is R1 = R2 = R/2
 
V1 = V2 = V/2
 
So, we get P1 = P2 = P/2
 
Hence, if we calculate the combined power, it will be P = P1 + P2 = 100 W
 
Hence, the energy consumed per second is E = P/t = 100/1 = 100 J

Answered by Romal Bhansali | 12th Jul, 2015, 12:21: PM