In the diagram above, X and Y have resistances 6 and 4 ohms respectively, if the power dissipation in X is 10W then power dissipation in Y is
A
2.4W
B
4
C
6.0W
D
6.7W
E
15.0W
Verified Correct Answer: D.
Physical Principles & Numerical Solution
P = \(\frac{ V^2}{R}\)
\(P_1 R_1 = P_2 R_2\) ( Parallel circuit)
10 x 4 = \(P_2\) x 6
\(P_2\) = \(\frac{40}{6}\) = 6.7W.
Source: Official Exam / Past Question Archive