Lag1989 problem number 15.21

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How many lamps of 300 W each, designed for a voltage of U = 110 V, can be installed in a building if the wiring from the main is made with copper wire with a total length of L = 100 m and a cross section of S = 9 mm² and if the voltage in the main is maintained to be U₀ = 122 b?

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