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NEET 2014 (AIPMT) · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from NEET 2014 (AIPMT)

Q49NEET 2014 · AIPMTMedium

Electrical Power & Heating Effect

Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5 $\Omega$ . The power loss in the wire is

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Answer: (b)

Total voltage drop in the line: $V = 8 \times 150 = 1200\text{ V}$ .
Line resistance: $R = 0.5 \times 150 = 75\ \Omega$ .
$P = \dfrac{V^2}{R} = \dfrac{1200^2}{75} = 19200\text{ W}$ .
So the answer is (b) 19.2 kW.

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