Ncert Exercises & Solutions

1 MW power is to be delivered from a power station to a town 10 Km away. One uses a pair of Cu wires of radius 0.5 cm for this purpose.
Calculate the fraction of ohmic losses to the power transmitted if;

(i) power is transmitted at 220V. Comment on the feasibility of doing this.

(ii) a step-up transformer is used to boost the voltage to 11000V, power transmitted, then a step-down transformer is used to bring a voltage to 220 V. $(ρ_{c u} = 1.7 \times 10^{- 8} S I u n i t)$

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