1. A transformer whose primary winding has twice as many turns as its secondary
ID: 1283092 • Letter: 1
Question
1.
A transformer whose primary winding has twice as many turns as its secondary winding is used to convert the alteranting current voltage of Vp = 0.9 V to Vs = 8.6 V. The current in the secondary circuit is Is = 3.0 A. Calculate the value of the primary current.
2.
What acts on the secondary coil of a transformer to cause an alternating voltage to occur across its ends, even though the primary and secondary coils of the transformer are not connected?
Select one:
A. Different number of turns (loops) in the windings.
B. The type of the wire of the secondary coil.
C. The varying magnetic field of the primary coil.
D. The varying electric field of the primary coil.
E. The iron core of the transformer.
3.
A conducting loop has an area of A = 1.6 m2 and is positioned such that a uniform magnetic field is perpendicular to the plane of the loop. The magnitude of the magnetic field decreases by ?B = 1.6 T in ?t = 0.26 s. Calculate the average value of the induced emf in the loop. Express your answer
Explanation / Answer
1. N1/N2 = V1/V2 = i2/i1
i1 = i2 * N2/N1
i1 = 3 * 1/2
i1 = 1.5 Amps
i1 = 28.66 Amps
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D. The varying electric field of the primary coil.
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induced emf e = NAdB/dt
emf e = 1 * 1.6* 1.6/0.26
emf e = 9.84 V
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