electrodynamics

[pedro_carlos]

What is the current that runs through the circuit below:

 

[Cap'n Refsmmat]

If this is homework, we're not just going to do it for you. Have you tried to solve it? Where did you get stuck?

[pwagen]

Use one of Kirchoff's laws to solve it. I can't look it up properly now, but you might or might not have to apply it to all points where the currents would "meet".

 

http://www.tpub.com/doeelecscience/electricalscience261.htm

[elfmotat]

This is a basic Ohm's Law problem. Show us what you've done so far and we'll give you some hints if you need them.

[pedro_carlos]

10-5-6-7 = 6 I + 8 I + 1 I +3 I + 4I + 2I

 

-8 = 24 I

 

-8/24

 

= -0,333333333 I

[imatfaal]

1 pick a direction and pick a start finish point

2 If you go through a battery -ve to +ve (small side to big side) add the EMF if you go through +ve to -ve subtract the EMF

3 If you go through a resistor add IR

4. that equation should equal zero (you are back to the same point from where you started from so there can be no overall difference in voltage) - solve for I. If I is negative it goes in the opposite direction to that whcih you chose, if positive it goes in the same direction

 

 

Seem a bit long-winded but it avoids putting the wrong sign on a EMF (hint). And it works for circuits with more than one loop - with a little bit of extra effort

Edited April 8, 2013 by imatfaal
sign mistake