Electronics and Communication Engineering - Power Electronics - Discussion


In the below figure the average load current is 15 A. The rms value of transformer secondary current is

[A]. 15 A
[B]. 10.61 A
[C]. 7.5 A
[D]. 14.14 A

Answer: Option B


RMS secondary current = = 15/1.414 = 10.608 A.

Muruganandam said: (Jun 27, 2015)  
How can the RMS will be lower than average?

Pande said: (Aug 6, 2015)  
How it can obtain?

Sachin said: (Dec 15, 2015)  
Please, elaborate the solution.

Abhishek said: (Apr 2, 2017)  
No, it's not correct.

As RMS value for full wave rectifier is = Imax/1.41.

And here Imax was not given, instead of it, Avg load current was given which is not same as Imax.

So, Irms is 1.11 * Iavg = 1.11* 15 = 16.65A.

Can anyone agree with me?

Priya said: (Jun 29, 2017)  
But this is thyristor not diode.

Lopamudra said: (Sep 28, 2017)  
Yeah, the thyristor is a controlled rectifier only. That means diode.

Kiran said: (Apr 20, 2020)  
Explain the correct answer.

Renjith V R said: (Sep 10, 2020)  
15 A is load current, So It will be the answer.

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