Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical PowerHard2 minQB

PhysicsHardsingle choice

Passage / Comprehension

For the circuit shown, answer the following questions.

Ratio of power developed by battery when all switches are closed to that when all switches are open :

Answer:

Solution:

All open: $R_{o p e n} = R + \frac{30 R}{7} = \frac{37 R}{7}$

All closed: the switches short every resistor, $R_{c l ose d} = R$

$P = \frac{V _{0}^{2}}{R _{e q}}$ , so ratio = $\frac{R _{o p e n}}{R _{c l ose d}} = \frac{37}{7}$

Answer (A)

Stream:JEESubject:PhysicsTopic:Current ElectricitySubtopic:Electrical Power

⏱ 2mℹ️ Source: QB

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