The main components of a transformer are two coils (windings) that are electrica

Question

The main components of a transformer are two coils (windings) that are electrically insulated from each other. The coils are wrapped around the same core, which is typically made of a material with a very large relative permeability to ensure maximum mutual inductance. One coil, called the primary coil, is connected to a voltage source; the other, the secondary coil, delivers the power. The alternating current in the primary coil induces the changing magnetic flux in the core that creates the emf in the secondary coil. The magnitude of the emf induced in the secondary coil can be controlled by the design of the transformer. The key factor is the number of turns in each coil.

Explanation / Answer

use

Ns/Np=Vs/Vp

and Ns/N=ip/is

A)3 V

b)10 turns

c)4000

d)12.5 A

e)400 W

power remains the same

f)P=VI

or I=0.5 A

g)e=(19.4*11.8)*100/(120*2)

=95.3833 %

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