Question

A transformer steps up an alternating current from

12V to 144V. If the current in the primary coil is 2A.
calculate:

(a) the electrical power of the primary coil
coils
answer = W

(b) the current in the secondary coil
(assuming a 100% efficient transformer)

answer = A

Answer 1

See the answers below.

Step-by-step explanation:

A transformer is a static electrical machine, it should be borne in mind that although the voltage can be increased or decreased, the power must always be equal.

For this case:

The power in the first coil can be calculated by means of the following formula.

`P=V*I\\`

where:

V = voltage = 12 [V]

I = current =2 [A]

a)

Therefore the power:

`P=12*2\\P=24[W]`

b)

Now in the second coil, the power must be the same:

`P_(secondcoil)=V*I\\24=144*I_(secondcoil)\\I_(secondcoil)=24/144\\I_(secondcoil)=0.166[A]`