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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical PowerEasy2 minPYQ_2009

PhysicsEasysingle choice

An electrical cable having a resistance of $0.2Ω$ delivers $10 kw$ at $200 V$ D.C. to a factory. What is the efficiency of transmission?

Options:

Answer:

Solution:

$P = V I \Rightarrow I = \frac{10 \times 1 0 ^{3}}{200} = 50 A$ , Power loss $= (50)^{2} (0.2) = 500 W$ Efficiency $= \frac{10000 \times 100}{10000 + 500} = 95.23%$

Stream:WBJEESubject:PhysicsTopic:Current ElectricitySubtopic:Electrical Power

⏱ 2mℹ️ Source: PYQ_2009

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