Problem 21.38: A step-up transformer Part A What is the ratio of secondary to pr

Question

Problem 21.38: A step-up transformer Part A What is the ratio of secondary to primary turns of the transformer? A transformer connected to a 120 V (rms) ac line is to supply 1.31x104 V (rms) for a neon sign. To reduce the shock hazard, a fuse is to be inserted in the primary circuit and is to blow when the rms current in the secondary circuit exceeds 8.10 mA . N2 NM Submit My Answers Give Up Part B What power must be supplied to the transformer when the rms secondary current is 8.10 mA? Submit My Answers Give Up Part C What current rating should the fuse in the primary circuit have? Submit My Answers Give Up

Explanation / Answer

(A) N2 / N1 = Vs / Vp

= (1.31 x 10^4) / 120

= 109

(B) P = Irms Vrms = (1.32 x 10^4) (8.10 x 10^-3)

= 107 W

(C) 107 = (120) Irms

Irms = 0.891 A

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