Start Free Mock LoginAlready registered? Login here

Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical PowerEasy2 minQB

PhysicsEasysingle choice

Different combination of $3$ resistors of equal resistance $R$ are shown in the figures. The increasing order for power dissipation is:

(A)

(B)

(C)

(D)

Options:

Answer:

Solution:

The resistances can be calculated as
$R_{A} = R + \frac{R}{2} = \frac{3 R}{2}$
For second circuit
$\frac{1}{R _{B}} = \frac{1}{2 R} + \frac{1}{R} = \frac{3}{2 R} \Rightarrow R_{B} = \frac{2 R}{3}$
For third circuit
$R_{C} = \frac{R}{3}$
For fourth circuit
$R_{D} = 3 R$
The formula for power is given by $P = I^{2} R$ .
Clearly,
$P_{D} > P_{A} > P_{B} > P_{C}$

Stream:JEESubject:PhysicsTopic:Current ElectricitySubtopic:Electrical Power

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...