4) A transformer has 80 turns in the primary coil and 4000 turns in the secondar

Question

4) A transformer has 80 turns in the primary coil and 4000 turns in the secondary coil a) If the primary voltage is 240 V what is the secondary voltage? b) If the primary current is 200 A what is the secondary current? 5) A step-up transformer has for every 1 turn on the primary side there is 2000 turns on the secondary side. If the step-up voltage was 60,000 V what was the primary voltage? 6) A neon sign has a transformer that changes electricity from 120 V to 12,000 V. a) If the primary coil has a current of 30 A what is the current in the secondary coil? b) What is the power in the primary coil? c) What is the power in the secondary coil? an

Explanation / Answer

4)

Given:

N1 = 80, N2 = 4000

(a)

V1 = 240V, V2 = ?

Using the transformer eqn."

V2/V1 = N2/N1

=> V2 = V1* (N2/N1)

= 240* (4000/80)

= 12000 V

(b)

I1 = 200A, I2 = ?

I2/I1 = N1/N2

=> I2 = I1 * (N1/N2)

= 200 * (80/4000)

= 4A

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