Resistors Definition and 603 Threads

Homework Statement Solve for all unkown i's and V's EDIT: there is a seventh resistor that is right under the negative side of the source. Vs=12V Homework Equations V=IR The Attempt at a Solution I got the I's by finding the voltage across the entire 2 loops to equal 0, then...

Homework Statement Reading the voltage taken at the output, Vo. Homework Equations Resistors in parallel carry the same voltage. The Attempt at a Solution The circuit shown in the diagram, the output is taken directly in parallel with Ro, so shouldn't that mean that: VRL =...

Homework Statement Determine Req, the missing I's and V's? Homework Equations V=IR The Attempt at a Solution First problem is that I thought I learned that R2 and R3 are in parallel so you have to use the recipercal rule, but looking back at my notes for Interpetation...

Homework Statement Three resistors are connected to a 9.00 V battery: R1 = 100 W, R2 = 200 W, R3 = 300 W. Determine the voltage, current, and power for each resistor for a series connection. Homework Equations V=IR The Attempt at a Solution V_{total}=I_{total}+R_{total}...

Iv started physics electronics literacy at university as a requirement for my degree, i didnt do science at school and I am very confused with what's going on..How to a determine a current in the resistors, please can someone give me a step by step on how they got to the answer...i have uploaded...

So i am having trouble figuring out how to approach this problem A) What is the current through the resistor, R1 in the above circuit? + --- _____________R2_________ /..... Joint / /______R1_________/___________R3/...

Homework Statement This is the diagram: https://wug-s.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?cc/DuPage/Phys1202/summer/homework/Ch-21-DC-Circuits/resistor_network/ex1s95p3.gif R1 = 3W, R2 = 6W, R3 = 11W, R4 =8W, V=6V A) What is the current through the resistor, R1 in the...

Homework Statement When two unknown resistors are connected in series with a battery, the battery delivers 260 W and carries a total current of 5.00 A. For the same total current, 35.0 W is delivered when the resistors are connected in parallel. Determine the values of the two resistors...

The network of resistors shown extends off to infinity. The resistors on the sides of the “ladder”, RS, are equal to each other,but different from the resistors in the center of the ladder,Rc .....Rs........Rs.....Rs a------^^^^^------c---------^^^^^------------^^^^^------------etc...

1. A student needs a 5Ω and 10Ω resistor for a circuit, but she only has a dozen 20Ω resistors. Does she need to buy new resistors or can she meet the circuits requirements with the resistors that she has? Explain (be specific!). 2. I honestly don't know any equation to use... 3...

Homework Statement The resistor R in the above figure has a resistance of 21.7 Ω. a) Find the current in the resistor R. (Enter a positive number for a current up and to the right, and negative for down and to the left. b) Find the current in the 10-Ω resistor. (Enter a positive number for a...

Homework Statement all resistors have arbitrary values. the equivalent resistance needs be found between terminal a and b.Homework Equations I have not got a clue how to tackle this problem. as such there is no attempted solution either.The Attempt at a Solution any help would be great. chollins

Almost forgot to mention: This is a DC Circuit! In the diagram above, find the potential difference across the 3-ohm resistor. a) 1.3 V b) 3.0 V c) 4.0 V d) 5.0 V e) 6.0 V Relevant equations: So far, I used: I = V/R to find current from the battery. Then there's E = IR. (Sorry, LaTeX doesn't...

Homework Statement I have 4 resistors R1=R2=R3=R4=40\Omega I need to find the Equivalent Resistance when they are connected in series and when they are connected in parallel. The problem is my answer for the parallel differs from the answer given in the book. Homework Equations Series...

Homework Statement A capacitor is charged through one bulb and then discharged through two bulbs. Mark each of the following statements true or false. a) The same amount of charge flows during charging and discharging. b) More charge flows through the single bulb than through the two...

2 terminals of a battery are connected to 2 50k ohms resistor...but in open circuit. i.e - ______ ---------/\/\/\/\/\/---|______|--------/\/\/\/\/\/\/\/----- ______ the...

I am using the UC3638 PWM chip to drive a motor. I was wondering if the current sensing resistors are required, and if someone could translate how they work? How are they used for peak current limit control and in their absence what happens? If more information is needed, its powered from a...

The other day I came into my living room, and noticed that the CFL in one of my lamps was flickering like crazy. Of course having a propensity to possibly fatal curiosity as some humans do, I walk over and grab the base to see if maybe the bulb isn't seated properly. The base of the bulb is...

in a simple circuit with only resistors and multiple batteries and multiple loops, which side is the positive and negative on the resistors? I am referring to the case of Kirchhoff rule in which I have to come up with equations to solve for current or voltage. But I got confused on voltage drop...

Here is a problem I have. I need to find the resistors R1 and R2, and here is what I know: http://triton.imageshack.us/Himg12/scaled.php?server=12&filename=varmalikam.jpg&xsize=640&ysize=480 How do I set up the equation? I am really lost. Please ask, if you are having troubles reading...

Hi all, In the circuit 1, R1 is ever, at least, 100000 times lower than R2. Is it possible to assume the second circuit is then valid?

. Homework Statement A ski resort consists of a few chair lifts and several interconnected runs on the side of the mountain with a lodge at the bottem. The lifts are analogous to the batteries and the runs are analogous to resistors. a) sketch how two runs can be in series b) sketch how two...

Homework Statement Homework Equations P=IV I=V/R P=(V/R)V R=V2/R The Attempt at a Solution PR1: 122/12=12 PR2: 144/18 I'm not sure what to do from here. Thanks for any input and help!

Homework Statement You are given a black box with three terminals, as shown below. The box is known to contain five 1-ohm resistors. B A C (d rectangle cannot b seen but jus imagine d rectange wid d terminal A on left side and B and C...

Homework Statement The picture given to me was this one: Homework Equations I've been reading through the book but I don't really understand what I'm looking at. I know that V=I*R. I'm confused about the part between 1.5V and 2V--what does it mean that it's positive at both...

Homework Statement How do the bulb's brightness compare? Which ones will be brighter or dimmer? What will happen if a resistor is placed before Bulb 2? and What will happen if a resistor is placed between Bulb 2 and 3? Does it matter if i place the resistor before or after the ammeter? Will...

Homework Statement The circuit shown in Fig. 25.37 contains two batteries, each with an emf and an internal resistance, and two resistors. Find (a) the current in the circuit (magnitude and direction) . . . The circuit is a rectangle with the emfs at the top and bottom sides and the...

Homework Statement well first its to plot the graph ( volt vs. current) then determine the effective resistance of the two resistors in series. 2nd compare the effective resistance of the resistors in series with the resistances of each resistors. Homework Equations R=V/I The...

Homework Statement The battery in the figure below has negligible internal resistance. Find (a) the current in each resistor: (b) the power delivered by the battery: Homework Equations V = IR Resistor Connected in series Req = R1 + R2 + R3 Resistor Connected in Parallel 1/Req = 1/R1 +...

i have 20 ultrabright white LED's and i want to get a good brightness out of them. they will be in 2 circuits of 10 leds each. i think i need 1 resistor per led but I am not sure which resistors to use. The LED's are 3.2 - 3.8V and 30mA. i plan to use 9v batteries in whatever combination is best...

Homework Statement A toaster with a Nichrome heating element has a resistance of 150 omega at 20degrees Celsius and an initial current of 2 A. When the heating element reaches its final temperature, the current is 1.73 A. What is the final temperature of the heating element? Homework...

Homework Statement R1 = 2 Ω R2 = 5 Ω R3 = 11 Ω R4 = 10 Ω V = 7 V What is the current through R2? Homework Equations Req for parallel resistors: 1/Req = 1/R1 + 1/R2... Req for series resitors: Req = R1 + R2... Electric potential V = current I x resistance R I have found...

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 A student mistakenly connects a perfect ammeter (i.e one of negligible resistance), in parellel with one of the two of the two identical resistors. The ammeter reads of 0.40 A. What would the reading have been if he had correctly connected the ammeter in series with two...

You receive a box of 9 resistors. All the resistors except one have a value of 1 ohm. With only an ohmmeter, what is the minimum number of measurements needed to identify the odd resistor and find its resistance. -I've tried going up from one resistor, but I'm not sure what I'm doing past 4...

1. A battery is manufactured to have and emf of 24V, but the terminal voltage is only 22V when the battery is connected across a 7.5ohm resistor...what is the internal resistance of the battery? 3. Ok I have the answer already which is .68ohm...but I can't find a way to get to it. At...

Do resistors in series and parallel obey conservation laws? why? I think yes, because I add individual resistance for the effective resistance ... but why? :| what's a true and deeper explanation for this??

Hey I have a 10amp 12v power supply and a 12v 3amp motor. Is there any way to add enough resistors to use the 10amp power supply with the 3 amp motor? If not is there any thing that I can put in line with the motor and power supply so the 10amps won't burn up my motor? Thanks Stephen Doty

Hello, I am new here and this looks like a good place to get answers! Wondering if someone could clarify something for me. When withdrawing current from a socket to an electrical device, the current is determined by I= V/R. So the manufacturer of the device can add resistors to manipulate the...

A question on my homework is asking about power delivered to resistors. These resistors are on an open circuit. While P=IV, it is also equal to (V^2)/R, so my question is if resistors are on an open circuit is it possible for power to be delivered to them? There is a source supplying voltage...

Homework Statement A Wheatstone Bridge with 5 resistors http://img529.imageshack.us/my.php?image=physicsproblemmo7.png Homework Equations Use Kirchoff's Law The Attempt at a Solution I know that I have to use Kirchoff's laws to find the current at each junction and then at the...

What is the current through the 10 ohm resistor? See figure below. The equations I got were: 12=10*I2+5*I1 9=10*I2+5*I3 But I am confused as to how to get the last equation from the junction. Would it be I1 +I2=I3? Once you have the three equations you would combine them and solve for...

A resistor in parallel with a voltage source or a resistor in series with a current source has no effect on the rest of the circuit?

How does a light dependent resistor (photoresistor) work in terms of photons and electrons? Thanks, Jamie

Homework Statement Determine the current in each branch of the circuit where R = 14.00 Ω, and V = 20.0 V. (a) branch containing resistor R (b) branch containing the 4.00 V source (c) branch containing the voltage source V Homework Equations N/A I have already completed...

Homework Statement Two resistors connected in series have an equivalent resistance of 744.7 Ω. When they are connected in parallel, their equivalent resistance is 130.4 Ω. Find the resistance of each resistor. Ω (small resistance) Ω (large resistance) Homework Equations Req = R1 + R2...

Homework Statement The circuit in the figure is composed of two batters (E1 = 5 V and E2 = 9 V) and four resistors (R1 = 110 W, R2 = 40 W, R3 = 50 W, and R4 = 50 W) as shown. Find I1 and I3 Homework Equations Well we need to apply KCL. I know the respective voltages (Ohm's law) need to...

Hello, I am working on a LED project that involves the use of three 3W LEDS. These LEDs are being driven at about 700mA (I believe). My source is 12V (8 AA's in Series) and I am using 16 Ohm resistors (one for each LED) capable of handling at least 5.4 watts ( ~15 Ohm resistor in series...

hi everyone, I am new to this forum, hope I am posting a thread in the right place, if not could any MOD please place my thread correctly... thanx guys i need to know how to connect my resistor to a LED i have 12 white leds 5mm that is 3.6v each @ 30mA im using a 12V power supply for...

Homework Statement Find the total resistance(Rt) of the infinite network. Allright, what we have is an infinite network of resistors which i will try to make a diagram of here : b--R1--c---R1-----R1-----R1--- so on ...!...!...! ...!...!...! ...R2...R2...R2 so on...