Resistor Definition and 879 Threads

Hi guys. I attached a picture of a circuit with 2 resistors in parallel. I want to verify if I'm reading the resistor bands correctly. For the left most resistor, the color gold is the tolerance right? For the right most resistor, the color gold is still the tolerance right? Does the...

I have been advised by my thermostat manufacturer that I need to reduce the voltage to prevent the O/B terminal on my thermostat from blowing again. The current voltage reading to power my thermostat is 28 volts and it needs to be closer to 24. I assume this is possible with resisters, but I...

Homework Statement http://imageshack.us/a/img210/3330/homeworkprob15.jpg Find I0 in the network. (The middle resistor value was not given)Homework Equations V = IR Voltage Division: (Voltage across series resistor) = [(resistance) / total series resistance)](total input V) Current...

Homework Statement http://imageshack.us/a/img62/5467/homeworkprob14.jpg A. Find the no-load voltage of V0 B. Find Vo when RL is 450 kΩ C. How much power is dissipated in the 30 kΩ resistor if the load terminals are accidentally short circuited D. What is the maximum power dissipated in...

Homework Statement A step input of 100V is applied to a resistor of 50Ω in series with an inductor of 10H at time t=0. Calculate the time at which the voltage across the resistor equals the voltage across the inductor Homework Equations Im not sure which equation to use, i know τ=L/R...

Homework Statement We are given a circuit as follows: V= 10 V and two resistors are in parallel. R1 is 12 ohms and R2 is 5 ohms. What is the power dissipated in the 12 ohm resistor? Homework Equations V=IR P=(I^2)R The Attempt at a Solution I know that the total resistance of...

Homework Statement Write an expression for the voltage across R3 in terms of V0, R1, R2, and R3. Under what condition is the voltage across R3 approximately independent of the value of R3? Homework Equations I uploaded a picture. I think Req = R1 + R2... and 1/Req = 1/R1 + 1/R2...

Background: I learned electronic theory 10 years ago from the Army, and have since worked in the electronics industry as a technician, for about the past 9 years. I'm working towards a BSEET (my interest lies in application, not research) and am required to take a few algebra based physics...

Dear all, I'm trying to understand the second figure of the following webpage. The webpage simply solve it by 'symmetry', but I could not figure out its reasoning. Could someone explain how does it work? Thanks in advance...

I have an Arduino Uno micro controller that operates at 5V and I'm doing some work with an LED. The positive leg of the LED has a 220ohm (1/4watt) resistor on it and goes into output pin 13 which produces 40ma @ 5V. My LED wants to have 2V @ 18ma. I'm not quite sure yet how to calculate the...

Everyone knows the classic series circuit rule that states that current is the same everywhere, but is this also true in the resistors or a load, like a light bulb filament? I would think that the resistance caused by the electrons smashing against the atomic nucleii in the conductor would...

Homework Statement Homework Equations Can anyone help me how to find the current 3.6mA analytically? I have tried but I didn't get any right answer. Thanks

As the title states I am really doubting Ohm's law. This is why: On a breadboard I placed a white LED and a 220Ω resistor with the 9v battery all in series. The total current flowing through the circuit shouldn't be more than 41mA by V=IR, but my multimeter points between the range of...

Hi, I have conducted an experiment for finding the latent heat of liquid nitrogen using a 5W power supply and a 200 ohms resistor. As part of my conclusions I am asked to discuss/refer to the resistor's temperature during the experiment. I am not sure whether I am expected to provide a...

1. An RLC series circuit has C= 4.8mF, L=0.520H, and source voltage amplitude V= 56.0V. The source is operated at the resonance frequency of the circuit. If the voltage across the capacitor has amplitude 80.0V, what is the vaule of R for the resistor? 2. ##I = (ΔVc)/(Xc)##, ##Xc=...

Hi, Do material posses both dielectric as well as resistance properties? I imagine that when there is a difference in potential across a volume of some material, some current will flow (I=V/R <-- the material's resistance), but also the material may become polarized to a certain degree...

Homework Statement A circuit is constructed with an AC generator, a resistor, capacitor, and inductor as shown. The generator voltage varies in time ε=Vb-Va=εm cos(ωt), where εm = 122.5 V and ω = 10.35 x 106 radians/second. The resistance of the circuit is R= 132.1 Ω. The inductance is L=...

I was using a signal generator to perform some tests. The circuit was simply the generator in series with a 1 ohm shunt resistor. Even though I was working with high frequencies (1 to 20 MHz), shouldn't the voltage drop across the resistor be the generator amplitude itself? I was using the...

I was recently informed that AC is the preferred method of transmitting power because it suffers significantly less power loss going from the generating station to where ever it needs to go when compared to DC losses. In my introductory electricity class we learned that power through a given...

Homework Statement I have the picture attached. Homework Equations I = V/R The Attempt at a Solution I labelled the 2ohm and the 1ohm resisters in series (R1 and R2). Labelled 5ohm and 1 ohm in series R3, R4. So i found the Req So R1 and R2 are in series so add them 2+1 =...

Simplifying "Complex" Resistor Circuits Homework Statement Question 1: I have an E&M test coming up and I'm having trouble simplifying complex circuits. Our teacher told us something about "pinching" the wires which I didn't really understand. I found the following link...

Let's say that I have an LED where If=20mA and Vf(typ)=2v. I want to power it directly with a 2v lead acid battery. According to most answers to this question I have read this will either not work (with the outcome unspecified), will destroy the LED, or is just a bad idea because of how an ideal...

Homework Statement Homework Equations The Attempt at a Solution What I did was I knew that the their are two resistors in series 1/req= 1/R + 1/R = 1/2R req= 2R Where I get confused is how do I include the other resistor since I believe that it is in series?

Homework Statement See attached image. Homework Equations The Attempt at a Solution I cannot find any resistors in parallel or series in the circuit. I am confused by the lone branch going from the 10kOhm resistor back to the other end of the same resistor. How do I deal with...

I can't seem to get the right answer for this question I am thinking (250+470) in parallel with 940. Can someone please explain me this question?

This circuit is really confusing me. I'm trying to find i using KVL and KCL. What's throwing me off is the short circuit effectively created by the inductor. I know that the whole circuit can't be short circuited because there is a current source that is preventing all of i from going through...

Hi all. I have been recording the thermal noise produced by a number of resistors. I have created a excel sheet that takes the readings from the 8 1/2 DVM and performs a FFT on them, in order to give me the frequency domain plot. However I am not 100% certain of what I am seeing because of my...

Homework Statement I'm really looking for help with A.) because I think that if I could figure out A.) the rest should be ok. So, here are all parts of the question, but I'm really only concerned with A at the moment! The diagram below depicts an RC-circuit where C = 5.40 F, R0 = 14.5Ω ...

Ive been given an assignment with the question being question 13of the following pdf: http://vlsi-eda.cm.nctu.edu.tw/course/ICT_12Summer/hw/HWCh4.pdf (note this isn't my actual assignment i just found this one on the internet that happened to be the same question that i was looking for) Im...

Homework Statement Find the current in the circuit and the voltage on the volt meter Homework Equations E=22.5 V Rtot= 1kΩ + 2.4kΩ + 5.6kΩ = 9kΩ I=U/R=22.5V/9kΩ=2.5mA A voltmeter has super high resistance, to prevent any current from passing through it. I know that. So I have...

Homework Statement One Thevenin theorem result is that the maximum power across the load resistor in the equivalent circuit (and therefore the real circuit) occurs when RL = Rth. Start with the result that the power dissipated by the load resistor is I2RL and prove this result. Homework...

I thought that resistors, like the ones that I buy at RadioShack, could only be used on D/C circuits. I was looking up how to's on electromagnets and found a thread that mentioned using resistors with A/C power. The thread was on this forum but I can't find it now. I am guessing that the...

As this is my first post please feel free to correct me if I am posting this is the wrong section or on improper etiquette in general. I'm having a bit of trouble with what should be a pretty simple problem. Homework Statement A resistor R1 = 23Ω is connected to a battery that has negligible...

Homework Statement We have this circuit. The problem states to find i, or the current through the 3 ohm resistor. Homework Equations V = IRThe Attempt at a Solution I've started by shorting out both voltage sources and leaving only the current source in the circuit. I paralleled the 4ohm...

I have a generator which after being regulated, outputs 70mA through 3V. (I should say the amps go through the voltage right?) In some circuits I may be using diodes. Some advice me that the voltage drop is 0,7. Others say it's dynamic, that I should divide the driving voltage over the...

Homework Statement Problem is give in the image Homework Equations V=IR The Attempt at a Solution Since its a series circuit i tried that current should be the same so it's 9/20 since there is no resistance in the bulb which is 0.45 Ω somehow the answer is 0.3Ω. why is that the...

In a simple circuit having battery (6v) connected to two resistors (1K each) in series, 3mA would flow through the entire circuit. 1) If resistor is a current limiting element, current following the first resistor should reduce its value (from 3mA to some other) before entering the another...

From the image attached: A. Calculate the current through the 22Ω resistor. B. What is the voltage across ab Here is what I've done: A. ) I labelled the currents and applied the Junction Rule I1 + I2 = I3 -I1*22Ω + 8V + 13*6Ω + 18V - I3*6Ω = 0 -I1*22Ω + 8V + I2*14Ω - 12V = 0...

http://www.itisff.it/dip_eln/tda2030.pdf Couple questions. 1. In the Typical Application diagram on the left there is Vi w/ a 22k resistor. Appears that there's a diode running into the resistor and then the resistor goes to ground. The question is how should I interpret that? The...

Homework Statement In the electric circuit shown in the figure, when the value of the variable resistor R3 is 25Ω, the current which flows into the power supply is 2A. Moreover, when the value of the variable resistor R3 is 5Ω a current of 1A flows into the resistance R2. Q1.Find the value of...

Homework Statement Reduce the resistor network to a single resistor. Go step-by-step and indicate the series or parallel combinations being reduced. Homework Equations For series resistors: R_T=R_1+R_2+R_3+\cdot \cdot \cdot +R_N For parallel resistors...

Homework Statement A battery is connected across a uniform resistor R0. A sliding contact can move across R0 from x=0 to x=10cm at the right. Moving the contact changes how much resistance R is to the left of the contact and how much is to the right. Find the rate at which energy is dissipated...

Every resistor has some variation with temperature. Let's say I pick a 2K resistor. Is the 2kohm specified at 0 deg C or room temp?

I've come across a booklet on understanding electricity, and it's been very interesting, but I've hit a rut! The packet says that the sum of the voltage drops of resistors equals the source voltage. How is that possible? Were the voltage to continuously drop, wouldn't no voltage exist at all...

I am using a 3.3 volt led rated 25 ma powered with 12 volts and have 1000 ohm resistor in between. Ohms law says amps = ohms / volts so 12 / 1000 = 12 ma so is this all the LED and resistor combined will draw? As I know the led can only handle 25 ma, but if the led where using this much current...

and what is its purpose? what does a resistor actually do? My understanding is that electrical resistance is sort of like electrical friction, or imagine sitting in a car, with your hand out of the window, as the car speeds up, you feel more resistance against your hand, and it takes...

Homework Statement When charging a capacitor with NO resistor in the circuit, the p.d of the capacitor IMMIDIATELY reaches a maximum... Homework Equations The Attempt at a Solution ...is the following reasoning correct: As stated by Kirchoff's Law, the sum of the potential differences...

Homework Statement Five resistors with resistance R1 = 4.00 Ω, R2 = 6.00 Ω, R3 = 2.00 Ω, R4 = 7.00 Ω, R5 = 4.00 Ω, are connected to a battery with emf = 8.00 Volts as shown in the figure. Find the equivalent resistance of the circuit. Give you answer with a unit of "Ohm". Homework...

[Confuse!]Capacitor and resistor in DC circuit, please help :) Homework Statement The figure in attached file below shows a circuit in which a battery (electromotive force = 10V) is connected with three capacitors (capacitance = 1 microFarad, 2microFarad,3microFarad) and two resistors...

Homework Statement Find an expression for Vo, the voltage across the resistor. Hint: find V1 and V2 first.Homework Equations i_c = C(dV/dt) V_c = 1/C integral( i dt )The Attempt at a Solution I think at t = 0, the voltage source turns on so @ t < 0 : V1(0-) = 0 V2(0-) = 0 @ t > 0 ...