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

See the answers below.

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.

where:

V = voltage = 12 [V]

I = current =2 [A]

a)

Therefore the power:

b)

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

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