While it is undeniable that the Covid-19 pandemic has affected every industry to some degree, since electricians provide an essential service many are busier than ever before. Licensed electricians can bid on and pull permits for jobs that unlicensed electricians simply can’t.
Careful exam preparation in the key to success. Can you answer the following theory related question with ease?
Question:
A transformer has a primary winding consisting of 890 turns and a secondary winding consisting of 499 turns with a secondary load current of 145 amperes. What is the primary current in amps?
Solution:
The key to answering this question is to understand that the side of the transformer with the greater number of turns of coil is the side that will have the higher voltage and the lower current.
Step #1 Identify required formula:
Ip = Ns x Is/Np
Step #2 Solve for Ip or primary current:
Ip = Ns x Is/Np
= 499 x 145/890
=81.2978 amps
Making sure that you can effectively answer electrical exam theory related questions is the key to successfully preparing to pass your electrical exam.
We’ll help you to understand exam question terminology and develop the test taking skills you’ll need to succeed. Call 888-919-3926 to start preparing to pass your exam today.