A transformer for an answering machine takes an acvoltage of amplitude 150 V as

Question

A transformer for an answering machine takes an acvoltage of amplitude 150 V as its inputand supplies a 7.9 V amplitude to theanswering machine. The primary has 400turns. (a) How many turns does the secondary have?

(b) When idle, the answering machine uses a maximum power of6.0 W. What is the amplitude of thecurrent drawn from the 150 V line?
mA
A transformer for an answering machine takes an acvoltage of amplitude 150 V as its inputand supplies a 7.9 V amplitude to theanswering machine. The primary has 400turns. (a) How many turns does the secondary have?

(b) When idle, the answering machine uses a maximum power of6.0 W. What is the amplitude of thecurrent drawn from the 150 V line?
mA
(a) How many turns does the secondary have?

(b) When idle, the answering machine uses a maximum power of6.0 W. What is the amplitude of thecurrent drawn from the 150 V line?
mA

Explanation / Answer

Given that Vp = 150 V Vs = 7.9 V Np = 400 turns (a) We know that Ns =   Np Vs / Vp                                  =   400 * 7.9 / 150                                  = 21 turns (b) We know that            Ip= P / Vp               = 6.0 / 150               = 0.04 A               = 40 mA

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