Question

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

• A. 0.1 watt
• B. 1 watt
• C. 10 watt
• D. 100 watt

Answer 1

Answer: (A)

0.1 watt

Answer 2

For power transmission power loss in line $P_{L} = i^{2}R$

If power of electricity is P and it is transmitted at voltage V, then $P = Vi$ ⇒ $m = 6.56g/s$

$P_{L} = \left( \frac{P}{V} \right)^{2}R = \frac{P^{2}R}{V^{2}}$ $= \frac{2.2 \times 10^{3} \times 2.2 \times 10^{3} \times 10}{22000 \times 22000} = 0.1W$