physics
posted by physics help? .
calculate the current in the secondary coil when the current in the primary coil is 0.50 A. there are 200 turns in the primary coil and 3000 turns on the secondary. the input voltage is 55 v

I pri/I sec= Nsec/Npri=Vsec/Vpri
you can use that.
I sec=.50(200/3000) amps
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