Re: how does electrity flow in wire

Posted by sotxbill on February 19, 2013 at 07:55:22 from (99.42.196.210):

In Reply to: how does electrity flow in wire posted by gtractorfan on February 18, 2013 at 15:33:55:

Think of electricity as water flow or air flow in a pipe or air hose and a pressure tank as a battery or storage vessel.

Voltage is the pressure of the water or air.

Current is the flow rate of the water or air.

More voltage or pressure means that you need a thicker air line or water line to hold the pressure.

More pressure or voltage means that you can also get more work done with the same size hose or air line.

ie a 1 inch garden hose will wash away more leaves or dirt at 100 lbs than it will at 5 lbs. So more voltage or pressure will push out more than less pressure will.

Conversly a bigger pipe or air line can do a lot more work than a small line with the same voltage or pressure. IE a fire hose at 50 lbs will wash off more leaves off the side walk than a garden hose at 50 lbs.. So more current will do more work at the same pressure than less current at a given pressure.

So, now you know how voltage and current works and why you need a bigger conductor/pipe for more flow.

While its been too many years since I studied skin effect... I do remember that under high current flow and high voltage.. Electrons are repelled from other electrons and are attracted to protons. So.. If you have lots of electrons, they tend to evenly space themselves as far away from each other as possible in the conductor.. As voltage increases,and more electrons are force into the conductor they will start to move to the outer edges of the conductor as there are no opposing electrons outside the conductor and lot inside so the electrons will move from the center to the outer and flow more there. With more electrons now flowing on the outer surface area, a stranded conductor can actually have more outer surface area due to the multistrands than a perfect circle. So in thery, more surface area will carry more current in certain conditions, and stranded will provide more outer surface. So there Lies the basis that stranded will carry more current in high current situations than solid. And stranded tend to run cooler at the same level due to the ability to pass more current in these situations.

Can I back this up? Will have to go back to my old engineering books. Its been 40 years plus. But this will hopefull help understand voltage, current and skin effect.

RF engineering and coax vrs waveguides are a bit difference based on frequencies.

Replies:

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Optional Video Title: Optional Video URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.   Advanced Posting Tools   Upload Photo  Select Gallery Photo  Attach Serial # List  Return to Post

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]