A power transmission line 50. km long has a total resistance of 0.60 . A generator produces 100. V at 70. A.
In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. (a) What percentage of the original energy is lost when the transformer is used? (b) What percentage of the original energy would be lost if the transformer were not used?
Question 2
Consider two diffraction gratings with the same slit separation, the only difference being that one grating has 3 slits and the other 4 slits.
If both gratings are illuminated with a beam of the same monochromatic light, make a statement concerning the separation between the orders. A) The grating with 3 slits produces the greater separation between orders.
B) The grating with 4 slits produces the greater separation between orders.
C) Both gratings produce the same separation between orders.
D) Both gratings produce the same separation between orders, but the orders are better defined with the 4-slit grating.
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Physics: Power, Energy and Time
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