Jump to content
Electronics-Lab.com Community
Sign in to follow this  
findhelporbust

missing some basic theory

Recommended Posts

Hi New Dude,
Neither voltage nor current goes in circles in a parallel circuit.
In your schematic, both resistors have the same voltage. The current in each one is determined by Ohm's Law (I= E/R). Their resistance in parallel Rp is also determined by Ohm's Law when you add their current into It (Rp= E/It).

If both paralleled resistors have the same value, their parallel resistance is half of one of them.
3 equal resistors in parallel = 1/3 of one of them.
4 equal resistors in parallel = 1/4 of one of them.
etc.

Just remember that resistors in parallel increases the current because thier value is approaching a short circuit that causes a very high current. ;D

Share this post


Link to post
Share on other sites

just as 2 people sitting together in a restaurant have more demand for food than a single person,similarly 2 resistors in parallel extract more current from supply and thus effective resistance is lowered.
Imagine what 100 people will eat!(case of a short circuit!!)
;D

Share this post


Link to post
Share on other sites

whatsthevoltage.JPG

i know when you put resistors in parrallel they lower in value, but is it because of voltage or current, (or is it both) going in circles, could use some help.
:-\
(beginer electronics dude here)


Here is a nice tutorial on series and parallel resistors that is not related to food:
http://schools.matter.org.uk/Content/Resistors/Default.htm
Hope it helps.

MP

Share this post


Link to post
Share on other sites

Once you find the total current I(p).  And you want to find the current going through one of the two resistors.  Take... I(R1) = [R2/(R2+R1)]*I(p)  or I(R2) = [R1/(R2+R1)]*I(p).  These are called a current divider equations.

Share this post


Link to post
Share on other sites

Hi,
Here i would like to put in some apt analogy than Food.
Electrons take lesser time to travel throgh lesser resistances like we do in lesser conjusted roads.
So more current flows through lesser resistances as current is rate of flow of electrons.
If we connect two resistors in parallel would be similar as 2 parallel conjusted roads and the total no of electrons flowing through will be sum of electrons flowing through both the resistors.
hence effective current increases for the same P.D
since R=V/I
the resistance decreases

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...