A house is supplied with a 240V a.c mains. To operate a door bell rated…

A house is supplied with a 240V a.c mains. To operate a door bell rated at 8v, a transformer is used if the number of turns in the primary coil of the transformer is 900. calculate the number of turns in the secondary coil of the transformer
  • A.
    30
  • B.
    240
  • C.
    248
  • D.
    450
  • E.
    1248
Correct Answer: Option A
Explanation

(frac{E_p}{E_s} = frac{n_p}{n_s})
ns = 30

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