Please help with these two questions. A high voltage transmission line that has

Question

Please help with these two questions.

A high voltage transmission line that has conductors (wires) of 0.0005 ohm resistance. The total power being transmitted is 100 MW over 200 km. at a voltage of 500 V. Calculate the loss of power in the transmission line due to its resistance. The image from a slide 34 mm high is to be projected on a screen. It is desired that the image should be 2.0 meters high, and 4 meters away from the lens. The projector has a lens with a focal length of 4.0 cm. How far from the lens should the slide be placed so as to form the required image on the screen?

Explanation / Answer

1)the loss of power is

P = (V^2/S x L)

where V = 500 V,S = 0.0005 ohm/m and L = 200 km = 200 x 10^3 m

2)size of object O = 34 mm = 34 x 10^-3 m

size of image I = 2.0 meters

distance of image is v = 4 meters

let u be the distance of object

we know that

(v/u) = (I/O)

or u = v x (O/I)

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