# More length in wire

Discussion in 'General Electronics Discussion' started by Life24, Sep 11, 2015.

1. ### Life24

6
1
Sep 10, 2015
Hello,
When we increase length of wire , we have voltage drop. why?
Thanks

2. ### donkey

1,293
56
Feb 26, 2011
because simply put, a wire has resistance. over long lengths its noticeable. voltage and current can be affected.

3. ### Ratch

1,093
334
Mar 10, 2013
You should be more specific. For instance, if I apply 12 volts across 1200 feet of wire, then there will be a 12 volt drop across the total 1200 feet of wire. Now, if I increase the length of wire to 2400 feet, then there still will be a 12 volt drop across the total wire. Is that what you wanted to know?

Ratch

4. ### Harald KappModeratorModerator

11,453
2,630
Nov 17, 2011
I doubt it. Donkey's answer is more to the point. Voltage drop along a length of wire is the product of the current through this wire and the resistance of the wire: V=I*R.
Therefore voltage drop increases if the resistance increases aka longer wire (of the same thickness, of course) or more current (higher load).
Essentialy the wire and the load form a resistive voltage divider

5. ### davennModerator

13,813
1,945
Sep 5, 2009
you and Donkey may well be right

But I suggest it seems ( as Ratch hinted at) that the Op doesn't really understand the meaning of voltage drop
considering how vague the question was

Dave

6. ### Harald KappModeratorModerator

11,453
2,630
Nov 17, 2011
Right, especially in view of his other thread which I just came across.