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 pri

Question

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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RI SƠ 4 years 2021-08-17T20:01:06+00:00 1 Answers 37 views -1

Answers ( )

  1. Bo
    1
    2021-08-17T20:02:31+00:00
    Reply

    Answer:1.81

    (a) Explanation:the turn ratio= input voltage÷output voltage.

    400÷220=1.81.

    Don’t know how to solve b part…

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