The primary coil of a transformer has 254,647 loops. The secondary coil has 1,85

Question

The primary coil of a transformer has 254,647 loops. The secondary coil has 1,852 loops. The primary coil has a 38 A current and 40 V.

a.) Is this a step-up or step-down transformer? How do you know? Choose one of the following.
It is a step-down transformer because all transformers are step-down transformers.
It is a step-up transformer because the primary has more loops than the secondary.
It is a step-down transformer because the primary current is less than the primary voltage.
It is a step-up transformer because the primary current is less than the primary voltage.
It is a step-up transformer because all transformers are step-up transformers.
It is a step-down transformer because the primary has more loops than the secondary.



b.) Determine the power of the primary coil.
__W
c.) Assuming no losses, determine the power of the secondary coil.
__W
d.) Calculate the voltage in the secondary coil.
__V
e.) Calculate the current in the secondary coil.
__A

Explanation / Answer

Part A)

Since N2 is greater than N1, the transformer is step-up. (Your third choice given)

Part B)

P = IV

P = (87)(19) = 1653 W

Part C)

P1 = P2 with no losses, so the Power is the same. It is still 1653 W

Part D)

Use the formula N2/N1 = V2/V1

(500141)/(3255) = (V2)/19

V2 = 2919 V

Part E)

P = IV

1653 = (I)(2919)

I = .566 A    or you can say 566 mA

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