Resistors Definition and 603 Threads

Find v1 and v2 in the circuit shown. Also calculate i1 and i2 and the power dissipated in the 12-ohm and 40-ohm resistors: My work so far: i_1\,=\,\frac{N1\,-\,N2}{12\Omega} i_2\,=\,\frac{N2\,-\,0}{40\Omega} i_3\,=\,\frac{N1\,-\,N2}{6\Omega} i_4\,=\,\frac{N2\,-\,0}{10\Omega}...

Hello all, I am working on a control circuit for a project that uses a 555 timer as a frequency controler. I need a variable resistor that has a range of 1-220 KOhms and I found some good 10-turn potentiometers that would seem to do the trick. But later, I was looking around on eBay and found...

Using superposition, find v_0 in the following circuit. My work so far: v_1\,=\,2\,i_2\,+\,v_{0\,1} v_1\,=\,4\,i_1 v_{0\,1}\,=\,3\,i_3 v_{0\,1}\,=\,6\,i_4 KCL @ v1: 1\,A\,=\,i_1\,+\,i_2 i_2\,=\,i_3\,+\,i_4 Using these six equations, with 6 variables...

(a) Using nodal analysis, determine i_0 in the circuit. (b) Now use linearity to find i_0. Work so far: i_0\,=\,\frac{v_1\,-\,0}{6\,\ohm}\,=\,\frac{v_1}{6\,\ohm} KCL@v_1: \frac{v_1\,-\,0}{3\,\ohm}\,+\,\frac{v_1\,-\,0}{6\,\ohm}\,+\,\frac{v_1\,-\,v_2}{2\,\ohm}\,=\,0 KCL@v_2...

are to reisistors considered in series if inbetween them is there is a wire supplying a current source not from the battery. for example if there was a wire giong up from point A to B and in that wire, there was a current source. A-----^^^(R1)----B----^^^(R2)

A 23 V battery is connected to terminals A and B below. (a) If R = 95 Ω, find the current in each resistor (/12, /55, /95). (b) Suppose the value of R is increased. For the 12 Ω resistor, does the current flowing through it increase or decrease? What about the 55 Ω resistor? What about...

Hello, I have this problem: design a circuit using diodes, resistors and voltage sources to obtain the input function. And the input function is Iin vs Vin plot with following points connected as straight lines: (2V,0mA), (3V,2mA), (4V,6mA). I guess I need a hint on what kind of topology...

Is it true that a "high" input of a TTL gate shouldn't be left floating but instead connected to +Vcc through a pullup resistor because this way the propagation delay time is reduced and less noise is captured? If that's true, should a pullup resistor be used when connecting the input of a...

I am given the following circuit: How do I find the current through the battery? I have trouble seeing which resistors are in series and which resistors are in parallel. I think I need to figure that out and then calculate R_eq accordingly. Then set I=V/R and solve for I. But which...

Is there a way to solve this mathmatically or do i have to draw out the 10 circuits and figure it out that way?

I have a picture attached. Hopefully you guys are able to see it. The question is asking the following: Find the equivalent resistance Req between points A and B of the resistor network. I know you have to use the resistors in series/parallel approach. but which of these are in parallel...

The little speaker in a portable radio is labeled 16 Ohm's , 0.1 W. To what current does that correspond? I'm kind of confused where to go with this one. what i know is this, 1 watt=1volt*1amp, but where do i go from there? Do I have to use Ohm's law somehow? V=IR. So does VI=.1 and...

Hey Guys, I learning about Related rates and although I understand the basic concepts, I'm stuggling with this problem - When two resistors r1 and R2 are connected in parallel, the total resistance R is given by the equation 1/R=1/R1+1/R2. If R1 and R2 are increasing at rates of .01 ohm/sec...

I'm not quite sure how I'm supposed to be doing this problem. Consider the circuit shown in the figure below. R = 21.3 ohms http://east.ilrn.com/graphing/bca/user/appletImage?dbid=411814203 Find the current in the 21.3 ohm resistor. I combined (serial) R with the 5.85 ohm...

When resistors are connected in parallel, which one , according to resistance value, carries the larger proportion of the currents? Does the ratio appear to be directly, or inversely, proportional to the ratio of the resistances?

You are given a number of 8 \Omega resistors, each capable of dissipating only 1.0 W without being destroyed. What is the minimum number of such resistors that you need to combine in series or in parallel to make a 8 \Omega resistance that is capable of dissipating at least 5.6 W? My approach...

|------A------| |.....* R2 - Vs.....|B -.....| |.....* R1 |------C----- | Assuming that the above is a circuit (sorry for the bad drawing, ignore the dots), what would be Ia, Ib, Ic (currents), Va, Vb, Vc (voltages)? Initially, I thought that the current and the voltage would be the...

I know that according to Ohm's Law that the voltage is directly proportional to the current in a resistor. Upon examing my graph that I have calculated in class, a resistor follows Ohm's Law because the slope was a straight line. The part I am confused about is why would the slope be equal to...

I got a question that reads: Supoose a 10khz signal with an amplitude of 1 volt is applied across a 1k(ohm) trdidyot snf s 0.25 microF capacitor which are connected in series. What is the voltage drop across the capacitor? I tried to use the equation Vc(t) + Vco*cos(omega*t) in which i got...

I have a series Circuit with a battery of 25 Volts and 2 Resistors, 1 is 250 Ohms and the other is 500 Ohms. What is wanted is a. I = _______mA b. V1 = _______ c. V2 = _______ To get I I took I = V 25 25 ______...

I have a problem where there are two resistors in parallel and I need to find the equivalent resistance. R1 = X and R2 = Y, and X and Y are independent random variables, uniform over the range of 100-120. If R equivalent = Z = XY/X+Y, what is probability density function of Z?

I have a problem where there are two resistors in parallel and I need to find the equivalent resistance. R1 = X and R2 = Y, and X and Y are independent random variables, uniform over the range of 100-120. If R equivalent = Z = XY/X+Y, what is probability density function of Z?

I'm building a circuit in one of my classes and it asks for a variable resistor. On the schematic it's value is 47kohms. On the circuit diagram I'm building this from, it says to adjust VR1 (variable resistor) until a diode comes on. First off, what exactly is a variable resistor? Second, how do...

Okay,, I am going to try and give precise instructions on how to draw the circuit so you all can see what I am dealing with here. This is not a homework problem really. We just did a lab and worked on measuring the currents through resistors using the Ammeter. Anyways, we worked with two...

Please help me with resistors in parallel/series - with many variables :) Three identical resistors are connected in parallel. The equivalent resistance increases by 700 W when one resistor is removed and connected in series with the remaining two, which are still in parallel. Find the...

Cant quite get this one. What I think is that I3 and I1 add together to get I2 and I found this equation V1+v2=E1-E2 and V3+V2=E3-E2 and I was substituting IR in for all the V's and I3+I1 where I2 comes in and making two equaitons and solving but no dice any tips? Thanks. _________/\R3\/l l...

Ok the question is: A resistor (resistance=R) is connected first in parallel and then in series with a 2.00 ohm resistor. A battery delivers five times as much current to the parallel combination as it does the series combination. Determine the two possible values for R. So let's see: I...

I am doing this bit of work on the reaction time of Light Dependant Resistors (LDR's) with different frequencys of light and i need to be able to get a graph out of it and I am not sure what to do for it. i was thinking of plotting reaction time vs. frequency but apart from making a graph and...

A 3 ohm resistor is connected in parallel with a 6 ohm resistor. This pair is then connected in series with a 4 ohm resistor. These resistors are connected to a battery. What will happen if the 3 ohm resistor breaks? I think that the power dissipated in the circuit will increase. The...

So this problem asks you to determine the magnitudes and irections of the currents in the resistors. I definitely understand how to determine directions, using Kirchhoff's Rules. But here is where I get stuck: the batteries have emfs of E1 = 9.0 V and E2 = 12.0 V and the resistors have vlaues...

Guys I need your help about resistors... These are the questions: 1. You have 4 identical resistors, each with resistance of 5 ohms. Show how you will connect the four resistors to get an equivalent resistance of 5 ohms. (hint: there is more than one way) 2. As more doors are opened in a...

This might be a silly one, but I'm a bit stumped: Suppose you have a 6V battery and an unlimited supply of 1 ohm resistors. How do you drop the potential from 6V to 4V using the resistors? Off the top of my head I think you just put two of the resistors into a series attached to the...

OK, I know this is a stupid question, but I just plainly forgot how to decode the value of the resistance of standard resistors from the color coding. I know the last band is soemthing to do with tolerance of the resistance values, but what is the value of the tolerance related to a certain...

Consider the above infinite chain of resistors. Calculate the effective resistance, R in ohm of the network between the terminals A and B given that each of the resistances labelled r=4180 ohm. I've split the resistor and I've done R^2-Rr-r^2=0, solving for R and I don't get the right...

Griffith's saying that in a resistor, P = RI² is the rate at which heat is dissipated. Is that suposed to be intelligible to someone who has no knowledge in thermodynamics? Can someone explain this process to me. What is HEAT? And how does the rate at which work is being done by the...

hi. ^_^ we recently did this experiment on measuring the actual resistances of resistors. every time, the actual resistance was less than the resistance on the label, except for the resistors arranged in parallel. the theoretical value for 100 ohm and 220 ohm resistors is 67.5 ohms, but...

I have spend many hours trying to solve this question but still can't figure out the answer.I hope that somebody will help me with this question.Thanks for anybody that spend some time on this question. I have my question and solution in the attachment followed.

... | ... R ... | -R- --R ... | ... R Suppose you have an infite array (2by2) of resistors, each of value let's 1k. If you place the an ohmeter accres one resistor, what resistance will the ohmeter read?

DIY heater with resistors??! help please Hi physics gurus, I have some questions I'm hoping someone with a kind enough heart can answer for me! I am trying to build a small circular heater (similar to a dew heater for a telescope) with resistors. Basically I have 22 gauge rated 300volts...

Can someone please explain to me what resistors do? And why we use them. Thank you.

Hey guys I am a bit stuck as to what to do here... we haven't covered much on RC circuits yet and id like to learn how to do this properly. Two 6.0µF capacitors, two 2.2 kiloOhm resistors, and a 12 V source are connected in SERIES. Starting from the uncharged state how long does it take for...

Hello I have an Electronic control unit supplying +5volts and 15mA to a Potentiometer. The control unit needs to have padding resistors that need to be sized correctly so the output of the potentiometer is 0.5 volts to 4.5 volts. Can anyone help me figure out how to size the potentiometer and...

Circuit Current I have the circuit below (also attached as an image): Note: ^^^^ & <<<< = resistors [-]=power supply ...=just space (-) & (+) indicates + & - side of battery A,B represent the junctions |-----^^^^------A-----^^^^------| |......|......| <......<......(-)...

Resistors in series and parallel (fixed) ___^^^^_____ |````````````| x````````````|___ `` __^^^^___|```| x`|``````````````| |`|``````````````| |_|``````````````| ``|__^^^^_______| Can someone explain why this is a series - parallel circuit? I don't understand why when starting from...

Hi there, I've another problem... as you can see I'm new to all these... pls forgive! senario: point A to B... across A and B there're 2 resistors R(1) and R(2) connected in parallel and R(3) in series to (R(1) and R(2))... Questions: 1) assume R(1)=5ohm, R(3)=2ohm and find R(2)...

Ok, so what i got here is a drawing of a circuit. It's rectangular, with points a & b making up one side of the rectangle. It's a symetrical diagram-use your imagination... 7 4 __w__ 9 __w__| |__w__ | |__w__| | |...

A galvonometer has a coil resitance of 460 ohms and a full scale deflection current of of 100^10*-6 A What shunt resistor is needed to convert this galv.. into an ammeter which has a full scale deflection current of 200 ^10*-3 A? What is the resitance of the ammeter when it is completed? What...

If resistors of 5 ohm, 20 ohm, 40 ohm, and 50 ohms are parallel with each other, the equivalent resistance would most nearly be how many ohms?

Problem with current and parallel resistors. Please help! Ok, I've got this homework problem that I'm somewhat stuck with. The problem relates to the picture below: I've got to figure out the total resistivity (done that), total current (done that), the current through the 21 ohm resistor...

Problem 7. A(n) 5.0 ohm resistor is connected in series with another resistor and a 6.0 V battery. The current in the circuit is 0.64A. Calculate the value of the unkonwn resistance. Answer in ohms. Note: I don't how to slove this problem. Problem 11. A 6.0V battery is connected...