Physics, 17.07.2020 02:01 potato3999

A transformer is used to light a lamp rated 40w, 240v from a 400v A. C supply. Calculate: A. The ratio of the number of turns of the primary to the secondary coil.
B. Current drawn from the main circuit if the efficiency of the transformer is 90%.

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A transformer is used to light a lamp rated 40w, 240v from a 400v A. C supply. Calculate: A. The ra...