A transformer connected to a 120-\ m V (rms) ac line is to supply 13000 \ m V (r

Question

A transformer connected to a 120- m V (rms) ac line is to supply 13000 m V (rms) for a neon sign. To reduce shock hazard, a fuse is to be inserted in the primary circuit; the fuse is to blow when the rms current in the secondary circuit exceeds 8.50 mA.

Part A
What is the ratio of secondary to primary turns of the transformer?
N2/N1 = ___________

Part B
What power must be supplied to the transformer when the rms secondary current is 8.50 mA?
P=______________W

Part C
What current rating should the fuse in the primary circuit have?
I1=_____________A

Explanation / Answer

The ratio of the number of turns of secondary to primary                                       Ns / Np = Vs / Vp                                                    = 13000 / 120                                   0r Ns / Np = 108.3 b) The Power of the secondary Ps =VsIs                                                      = 13000*8.50*10-3                                                 Ps = 110.5 W c) The current Is / Ip =Np / Ns              0r Ip = Is ( Ns / Np)              0r Ip = 0.918 A

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