In the diagram above, the ratio of the electric power dis...
In the diagram above, the ratio of the electric power dissipated in the 6Ω and the 3Ω resistor respectively is
2:1
2:2
1:3
1:2
Correct answer is D
Power, P = I2R;
and I = E/R
But effective Parallel resistance: is given by:
1/R = 1/6 + 1/3 = 1+2/6 = 3/6 => R = 6/3 = 2Ω
Current I = E/R = 12/2 = 6A
But I1 = (R1/R1+R2) x 1 = 3/9 x 6 = 2A
again I1 = (R1/R1+R2) x 1 = 6/9 x 6 = 4A
∴P1 = I12 R1 = 2 x 2 x 6 = 24W
P2 = I22 R2 = 4 x 4 x 3 = 48W
thus P1/P2 = 24/48 = 1/2 ; OR P1 : P2 = 1:2
Similar Questions
What happens when three coplanar non-parallel forces are in equilibrium? ...
Which of the following waves are longitudinal waves? I. Ripples on the surface of water II. Wave...
The correct unit of energy density is? ...
A magnetic field is said to exist at a point if a force is ...
Which of the following electromagnetic waves is most energetic? ...