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Thanks for sharing this video. There is an updated version of this video that uses the same variables used in the Reference Handbook for added clarity:

Unfortunately, summing the series and common winding power does not add up to the power rating of the auto-transformer. However, you can use the series or common winding power along with the turns ratio of the auto-transformer to calculate the power rating of the auto-transformer using the...

Thanks for sharing my our per unit explanation article for the PE exam, @main197!

That is interesting. I'm assuming that by Pmech, Chapman is referring to the mechanical losses from friction, windage, and stray losses, or: Pmech = Pf+w + Pmisc If Chapman is calculating the output power (Pout) from the converted power (Pconverted), then yes I agree the core losses (Pcore)...

Hi @the_r0b, you raise an interesting question. I find two things interesting about this. 1. The difference in the air gap power (PAG) calculated using the book's method, vs calculated using P_AG = P_in - P_SCL - Pcore is the same value as given core losses of P_core = 200W. 2. Although the...

Here is an example video on how to solve wave propagation for anyone that needs help with learning electrodynamics for the Electrical and Computer FE Exam:

Three 25 kVA single-phase transformers connected together to serve a three-phase load will be able to supply a total of 75 KVA. Each individual transformer is supplying 25 kVA.

Thanks @COJeff !

Thanks for the mention @akyip! @jkattan if you haven't already, I suggest taking a look at the Power PE study videos we have on your YouTube Channel and the free online course work we have included in the Free Trial of our online program for the Power PE Exam to get you started on the right...

Congrats @Tokoyoshi! Thanks for being a student in our online class for the new CBT format of Power PE Exam at www.electricalpereview.com. Always happy to hear when we are able to help engineers with a different engineering background like mechanical pass the power PE exam.

My pleasure.

Agreed. The different types of single-phase configurations can be somewhat confusing at first. What I find helps is that realizing a single-phase circuit consists of just one single individual load, with one round trip circuit connecting across both terminals of the load (compared to three round...

This is a short clip taken from last semester's fall 2021 live class for the Power PE Exam on protection. In this video, I'll show you why the relay current input from delta-connected current transformers is increased by a factor of the square root of three (√3): Another way to think about...

Thanks @DLD PE !

We are just ONE WEEK away from the start of this semester's first live class for the Power PE Exam! Next week, all students with an active enrollment will receive a calendar invitation to our first live class of the semester scheduled for January 25th, 2022. Learn about the different inverse...

Thanks for the mention, @main197 !

Good to hear from you Duran! Your post count is impressive :) Shoot me an email if you'd like to be put on the list for a complimentary advanced copy of our new AIT practice exam that should be coming out in a month or two.

Don't let our practice exam scare you, it is intended to be used as a learning tool instead of a diagnostic tool. Keep your head up, breathe, and trust what you've learned to get you past the exam. Please email me directly when your results come in so I can follow up with additional...

Happy to help 👍

Which ambient temperature correction table? Use the correction table for 30ºC conductors if the allowable ampacity comes from a 30ºC table, and use the correction table for 40ºC conductors if the allowable ampacity comes from a 40ºC table (see my first response in this thread).