## A community for students. Sign up today!

Here's the question you clicked on:

## lilMissMindset 2 years ago two electric devices A & B are connected in parallel and the rms current in A is 15 A. If the current in B lags behind A by pi/2 radians and the line current is 23.4 A. Determine the current in B

• This Question is Closed
1. lilMissMindset

@satellite73 help me here please.

2. radar

|dw:1347318735842:dw| Load B Lags A by 90 degrees. The line is the resultant you Pythagorean theorem

3. radar

$\sqrt{23.4^{2}-15^{2}}$

4. lilMissMindset

why subtract?

5. lilMissMindset

i get it why. lol

6. radar

The line current is the resultant or the "total" In order to separate the total to the individual components, subtraction is the logical choice.

7. lilMissMindset

so that is the current in B?

8. radar

Yes about 18 amps

9. lilMissMindset

another question, what is the difference between rms current and line current?

10. radar

It is an inductive load when compared to the 15 amp load, or you could say the A is a capacitive load when compared to B. It is all relavent.

11. radar

The line current is the combined currents of the two loads and is the current traveling to and fro from the power source. It is of course AC as we are talking RMS, all the currents in this problem is assumed to be measured in RMS units......including the line current.

12. radar

Root Mean Square (RMS) is the most common value to measure AC, it is the value that DC current would produce as heat when the AC RMS value is converted to heat.

13. radar

Kind of confusihng, but AC has several values of current/voltage. Peak Peak to Peak RMS (root mean square) Average

14. lilMissMindset

ok. thanks a lot! :)

15. radar

Good luck, are you pursueing an electrical engineering major?

16. lilMissMindset

no. actually, my major is mechanical engineering, it's just that it's an elective course.

17. lilMissMindset

are you ana electrical engineer?

18. radar

Understand, good luck with it, and I think you are getting into a great field.

19. lilMissMindset

thank you. :) hope i can make it. :)

20. radar

Not a degreed EE, but an EE as far as the U.S. Government, I was a GS-855 for the FAA for years. There are other methods to become an engineer, but I recommend the method you are going, a formal education with a degree.

21. lilMissMindset

i see. hail to all engineers. :)

22. radar

HooRah! Yeah

#### Ask your own question

Ask a Question
Find more explanations on OpenStudy