Total resistance Definition and 67 Threads

What single, equivalent resistor could replace all of the resistors in this circuit? Rtot = Ω 2 NO HELP: If you study the diagram, you will see one pair of resistors which is in parallel. Replace this pair with a single equivalent resistor and re-draw the circuit. HELP: If you have...

Homework Statement Two 1275m long wires are connected in parallel. One conductor is copper at 1.11mm in diameter and the other is aluminum at 2.23 mm in diameter. Find the total resistance of wires at 25 C, at 105 C, and minus 40 C. Homework Equations 1/Rt=1/Ra+1/Rc...

Homework Statement I have a network of resistors in a box-formation. There is 1 resistor of equal resistance in between every corner of the box, so 12 in total. Homework Equations In series R = r1 + r2 + ... ri In parallel, 1/R = 1/r1 + 1/r2 + ... 1/ri The Attempt at a Solution...

Homework Statement Find the total resistance of this circuit: each resistance in this circuit is 20ohms. (r1=r2=r3=r4=r5=r6=r7=r8=20ohms) Homework Equations Rt=r1+r2+r3... for series 1/Rt=1/r1+1/2r+1/r3... for parallel The Attempt at a Solution since r4 and r5 is parallel...

Homework Statement Assuming R = R' = 1.97 Ω in the network shown above, determine the net resistance a) between the points a and c b) between points a and b. HELP: Use symmetry. HELP: Imagine applying a voltage between a and c and think about what current will flow in each resistor...

Homework Statement Two resistors, R1 and R2, have an equivalent resistance of 710 ohms when they are connected in series and an equivalent resistance of 200 ohms when they are connected in parallel. a) what are R1 and R2 b) Determine the current traveling through the resistors when they...

Homework Statement Suppose a resistor R lies along each edge of a cube (12 resistors in all) with connections at the corners. Find the equivalent resistance between two diagonally opposite corners of the cube Homework Equations \SigmaI = 0 at a node (a junction) \SigmaV = 0...

Hey guys, I have a quick multiloop circuit question: You're given this circuit with each of the resistors being 5 ohms and are asked to find the total resistance between points F and G. I imagined a 15V battery between those two points so I could get currents. - Through the top...

Homework Statement https://www.physicsforums.com/attachment.php?attachmentid=11955&stc=1&d=1197437955 Find the equivalent resistance between points A and B shown in the link above Homework Equations for parallel, equivalent resistance is =1/R1 +1/R2 +1/R3... equivavalent resistance...

Homework Statement http://img442.imageshack.us/img442/8052/omgfs0.th.png Find total resistance between A and B The Attempt at a Solution Well, first I tried using Kirchhoff's Laws to find the resistance, but that ended up being a total mess so here's what I tried, not sure if it is correct...

I'm trying to understand how fractions relate in total resistance. You have parrell circuits. Each one has a 2 ohm resistor on it. FOr if you go by the law 1/total resistance = N/sum of resistances. SO that gives us 1/total=2/1 It we make the 2 a 1 that means the 1 becomes 1/2. SO that...

please feel free to move this thread as i cannot find the correct place. in a series (dc), when two bulb of the same resistance is used, the two bulbs lighted up as bright. when one bulb is used instead of two, the bulb ligth up brighter. if again, two bulb arrange in circuit, why not...

I understand why the total resistance in a series circuit is a total off all the resistance added together. It seems obvious because all of the electrons will have to go through all of the resistors. Now, total resistance in a parallel circuit is really messing with my head! In a parallel...

Hey, I am trying to calculate the total resistance for this but I always come up with the wrong answer. A picture is available http://img109.exs.cx/img109/5889/physics.jpg In this picture every blue line is supposed to be a resistor with resistance R (yeah, I know it's ugly :-p ) The...

I'm having trouble find the total resistance of circuits with cells in parallel. The answer in the book is 31 ohms, but my calcuation ends up as 30 ohms. What am I doing wrong? (Please show steps if not too much trouble) Thanks in advance!:D See this site for my work and a diagram of the...

If there were 2 wires, and one of the wire has a resistance of 50 Ohms with a tolerance of 5%, while the second wire has a resistance of 60 Ohms with a tolerance of 3%. The total resistance would be 110 Ohms but what about the total tolerance? Would it be 8%?

In a series circuit, do large or small resistances have large or small voltage drops? If resistance is added to a seriese circuit, total resistance in the circiut increases right? If resistance is added to it, total current in the circiut decreses right?