A wire when connected to 220 V mains supply has power dissipation P 1 . Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is P 2 . Then P 2 : P 1 is-
Text Solution
Verified by ExpertsB
Using the formula P = 
...(i)
Where R is resistance of wire, V is voltage across wire and P is power dissipation in wire and
R = 
...(ii)
From Eqs. (i) and (ii)
P 1 = 
= 
. A
P 1 = 
. A ...(iii)
In 2nd case
Let R 2 is net resistance.
R 2 = 
= 
Where, R is the resistance of half wire.
∴ R 2 = 
= 
∴ P 2 = 
. 4A ... (iv)
Hence, from Eqs. (iii) and (iv)
= 
= 
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems