ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Extension cords
by Texas_Ranger. 09/25/18 04:37 AM
220/230/240V 60Hz Systems
by gfretwell. 09/23/18 02:50 PM
Inspection camera help
by petey_c. 09/22/18 07:52 AM
Motion detectors and dimmers
by gfretwell. 09/20/18 04:02 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 33 guests, and 19 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Electrical theory #213431
04/27/14 05:46 AM
04/27/14 05:46 AM
H
Henry_Jackson816  Offline OP
New Member
Joined: Apr 2014
Posts: 2
Australia
Having trouble with one of my electrical maths problems. Any solutions or pointers would be greatly appreciated.


Attached Files
Tools for Electricians:
Re: Electrical theory [Re: Henry_Jackson816] #213435
04/27/14 09:34 PM
04/27/14 09:34 PM
T
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
As an Electrical Contractor, I stopped playing with EE puzzles ages ago.

As for the matter at hand, this is nothing but algebra with complex numbers.

It looks like it's been lifted from a Schaum's outline book.

When I was taking college Physics, the graduate students would 'mine' Shaum's all of the time. They were so lazy they wouldn't even change the variables.

This equation is either right in there or something like it.

BTW, the notation used might introduce confusion.

A bar over a variable figures to indicate that the value is a Tensor. (Vector)

http://en.wikipedia.org/wiki/Tensor

{ All vectors are tensors, too. }

http://en.wikipedia.org/wiki/Electromagnetic_tensor

( One need not go all of the way deep into QED and the rest of wave physics. )

In other settings that same bar symbol indicates DC vs AC current. So, your diagram seems odd.

In your equivalent circuit -- no such beast could actually be constructed -- ALL of the load has to pass through the resistor. The first resistor is NOT deemed to be part of the load.

In this idealized circuit the inductor and capacitor have ZERO resistance. They just bounce the current around.

I dislike the use of the L subscript for both Load and inductance.

BTW, it's strongly implied that the inductance and capacitance HAVE to balance -- perfectly -- to obtain minimum source current.

The algebra follows rather directly, doesn't it?

Best of luck.




Last edited by Tesla; 04/27/14 09:35 PM.

Tesla
Re: Electrical theory [Re: Tesla] #213437
04/29/14 05:42 AM
04/29/14 05:42 AM
H
Henry_Jackson816  Offline OP
New Member
Joined: Apr 2014
Posts: 2
Australia
Good info, thanks for the reply!


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
HappyElectrician
HappyElectrician
Penn USA
Posts: 31
Joined: December 2011
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Popular Topics(Views)
249,452 Are you busy
187,374 Re: Forum
176,711 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.023s Queries: 16 (0.005s) Memory: 0.9517 MB (Peak: 1.0800 MB) Zlib enabled. Server Time: 2018-09-25 13:32:08 UTC