Question

Which statement correctly describes a step-up transformer?

A. It increases the amount of electric energy available.
B. It increases the voltage of an electric current.
C. It changes direct current into alternating current.
D. It has more loops of wire in its primary coil.

Answer 1

B. It increases the voltage of an electric current. Same way a step down would decrease the amount of voltage.

Step-by-step explanation:

Answer 2

B. It increases the voltage of an electric current.

Step-by-step explanation:

In step up transformer the number of turns of the coil on the output side is more than the number of the turns on the input side of the coil

so here the flux on the output side of the coil will be more

hence we will have

`\phi_2 = N_2\phi_o`

`\phi_1 = N_1\phi_o`

here we know that

`\phi_o` = flux linked with one coil

so here we know by Faraday's law

`(d\phi)/(dt) = EMF`

hence the net EMF or voltage of the output side will be more than the voltage on the input side

So we have

B. It increases the voltage of an electric current.