Electronics - Transformers - Discussion

Discussion Forum : Transformers - General Questions (Q.No. 2)
2.
A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 omega.gif load. What is the efficiency of the transformer?
88%
90%
92%
95%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
14 comments Page 2 of 2.

Kalai said:   1 decade ago
Good solution.

Yogeshwaran said:   1 decade ago
Nice explation sir.

Ramkumar said:   1 decade ago
pin= v*i = 120*.3 = 36

pout = v^2/R = 18^2/10 = 32.4

eff = pout/pin = 32.4/36 = .9*100 = 90%

Ricky said:   1 decade ago
How did you calculate it?


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