An AC transformer has 100 turns in the primary coil and 400 turns in the seconda

Question

An AC transformer has 100 turns in the primary coil and 400 turns in the secondary coil. The primary coil of the transformer is connected to an alternating power sourceof 500 Voltts producing 15,000 Watts of power. The transformer has a laminated core so that there are no significant energy losses due to eddy electrical currents.

(a) How much current will flow throught the primary coils of the transformer ?

(b) What voltage wil lappear across the secondary coils of the transformer ?

(c) How much current will flow through the secondary coils of the transformer ?

(d) Is this a step-up or a step-down transformer ?

Explanation / Answer

part a )

Vs*Is = Vp*Ip

VI = P

15000 = 500 * Ip

Ip = 30 A

part b )

Ns/Np = Vs/Vp

400/100 = Vs/500

Vs = 2000 V

part c )

Ns/Np = Ip/Is

Is = 30* 100/400

Is = 7.5 A

d )

step up

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