Resistors Definition and 598 Threads

Hello all. If I was to create a circuit with a 2 kV power supply, how would I reduce the current so that if I were to accidentally become part of the circuit, I would be in no danger? Another question: Does a bleeder resistor help? Thanks.

Homework Statement Calculate the voltage, current, and power across the two resistors for every second of run 1 in the RC circuit. The RC Circuit: The settings of the circuit: The Graph. The capacitor is charged until it reaches 5.0 V and then discharged until it reaches 1.0 V. This...

Homework Statement If you measure the resistance of the three lightbulbs (independently) and get the following values. What is the equivalent total resistance of the circuit, and it’s uncertainty. R_1 = (50 \pm 7) \Omega, \ \ R_2 = (720 \pm 30) \Omega, \ \ R_3 = 140 \pm 20) \Omega Now you...

I am really not sure about this ... I may be generalizing it ...but anyway... suppose we have two resistors in series...connected by ofcourse a voltage source...and a certain amount of total current is flowing through the whole circuit.. now if we want to make the total current totally...

Homework Statement The ammeter reads 5.0A. Find I1, I2, and ε Homework Equations ΔV=IR The Attempt at a Solution I've never dealt with ammeters before so I'm very confused. To start, I tried breaking this into loops, and then used Kirchhoff's Law. I started with the left side, since I...

Homework Statement As contact point Y moves to X, the lamps becomes brighter. Why is this so? Homework Equations R=p (length/Area) I=V/RThe Attempt at a Solution As Y moves closer to X, length of wire decreases, hence resistance decreases and brightness of lamp increases. I am not clear of...

Hello, I am not quite sure how to work out the before and after charging values for resistance and current. This is the circuit I am working with: So, when there is no voltage then the capacitor can be technically not considered as part of the circuit. So for the resistors, would R = 1/R1...

In a current mirror circuit ..presence of an emitter resistor (R1 and R2) increases the output resistance which minimises harms of early effect...how? why its advantageous to have a high output resistance in current sources/current mirror circuits?

Homework Statement The resistor R in the above figure has a resistance of 19.1 Ω. a. Find the current in the resistor R. b. Find the current in the 10-Ω resistor. 2. Homework Equations Kirchhoff's Laws (Junction Rule and Loop Rule) V=IR The Attempt at a Solution I figured out part a (I...

Homework Statement Assuming R = R' in the network shown above, determine the net resistance between the points a and c. Express your answer as a number times R. b. Assuming R = R', determine the net resistance between the points a and b. c. Now suppose R' = 2.5R, and find the net resistance...

If there is only one resistor, the voltage drop is equal to the potential of the positive terminal. The voltage drop across more than one resistor is directly proportional to the value of each resistor. But the total drop in potential difference must be equal to the potential of the positive...

Homework Statement Assuming R = R' in the network shown above, determine the net resistance between the points a and c. Express your answer as a number times R. b. Assuming R = R', determine the net resistance between the points a and b. c. Now suppose R' = 2.5R, and find the net resistance...

Homework Statement A 2.44-kΩ and a 4.92-kΩ resistor are connected in parallel; this combination is connected in series with a 1.12-kΩ resistor. If each resistor is rated at 1/2 W, what is the maximum voltage that can be applied across the whole network? Homework Equations P=V^2/Req V=I*R...

I've got two resistors in parallel (X and Y) and a variable resistor, ammeter and voltmeter. SEE PHOTO! I've calculated the value of X by measuring V and I when the switch is open. I can close the switch and measure V and I but how do I calculate the resistance of Y? I know 1/x + 1/y = 1/R...

Could you solve this?

Homework Statement NOTE: Image uploaded with thread shows problem in clearest possible form. V = (45v)sin(80[pi] t) Resistors 1 and 2 = 50 Ohms Inductor 1 = 20 mH Inductor 2 = 2.5 mH Capacitor = 50 uF a) Find the power dissipated by each resistor. b) At what frequency will both resistors...

Here is a picture of a circuit: I have two questions: (1) Are all resistors connected in one of two ways? I.e., resistors can be connected in parallel and in series, but is it possible for them to be connected as NOT parllel and NOT series? For instance, the two circled resistors don't seem...

Consider a wire connected to a battery. Now,potential is analogous to the energy of the particles.And potential in a resistor drops because of the friction inside the resistor(considering there is no friction along the wire and outside the resistor).So the friction determines how much energy is...

I know how to derive the expression Vout = -CR*d(Vin)/dt for a circuit differentiator that consists of a capacitor and a resistor, how I can understand the attached circuit, which is part of practice exercise for my class. Why do we need to add R2 and R3? When I run the simulation Vout =...

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

Homework Statement Picture provided. The current going through the resistor R1 in the figure does not change whether the two switches S1 and S2 are both open or both closed. The resistances are R1 = 14.00 Ω, R2 = 142.00 Ω, and R3 = 24.00 Ω. The voltage is V = 11 V. With this information, what...

Homework Statement Determine the voltage at each labelled point with respect to ground Homework Equations V*r1/(r1+r2) i*r1/(r1+r2) i=v/R The Attempt at a SolutionI'm doing a practice problem and I can't seem to get the right answer. I just want direction in the way to solve it, these are...

Homework Statement The current going through the resistor R1 in the figure does not change whether the two switches S1 and S2 are both open or both closed. The resistances are R1 = 70.00 Ω, R2 = 50.00 Ω, and R3 = 62.00 Ω. The voltage is V = 15 V. With this information, what is the value of...

My gut instinct is that putting all the resistors in series will give max resistance, but I am not sure how to give a more rigorous either mathematical or just in words reasoning why. Or maybe I'm wrong! But it seems like the fraction introduced from parallel won't help In any case, assume all...

I am taking an intro electrical circuits course which requires that I write extensive lab reports. I just completed a really simple lab about calculating resistance when configured in series and parallel, etc. In my intro I'm writing a short explanation about resistance, and resistors, and...

Homework Statement Ignore the internal resistance of the battery and assume it is merely a battery. Calculate the equivalent resistance of the circuit. Homework Equations 1/Req = 1/R + 1/R ... (parallel) Req = R + R ... (series) The Attempt at a Solution I know this is fairly simple but I...

Homework Statement https://6002x.mitx.mit.edu/static/circuits/ocwe1_1.png [/B] What happens when you click on this link? https://6002x.mitx.mit.edu/section/three-series-resistors-slow/ Exercise 1-1, Part 1, Detail Or this one https://6002x.mitx.mit.edu/courseware/ The original problem is...

hello! why capacitors and inductors affect the phase of both current and voltage of a AC circuit and resistors don't? let's say we have an AC circuit with resistors only, then there is no change in the voltage and current as imposed from the voltage/current source, right? but what happens...

Homework Statement [/B] R1 = 42 Ω R2 = 124 Ω R3 = 119 Ω R4 = 105 Ω Rx = ? I4 = O A Homework Equations R = IV V = V1 = V2 for parallel Resistors Iequiv = I1 +I2 for parallel Resistors Vequiv = V1+V2 for series Resistors Iequiv = I1= I2 for series Resistors The Attempt at a Solution I have...

I would like to know what will give me a constant voltage no matter what the input is (within reason of course) Example: input 9 volts, output 1.5 volts; input 6 volts, output 1.5 volts; input 1 volt, output <1.5 volts.

Homework Statement There is a circuit with a battery of voltage V and resistor R, then splits into two branches one with a capacitor C, and one with a resistor 2R. The answers for the questions can only depend on R, C, V, and t. When a switch only allows current to flow through the capacitor...

How do you tell if 2 resistors (or capacitors, etc.) are in parallel or in series? For example, calculate the resistance in the following circuits: How is the first circuit simplified, and what is an easy way to distinguish which resistors are in series, and which are in parallel? Thanks!

Homework Statement A resistor with R1 = 25.0Ω is connected to a battery that has negligible internal resistance and electrical energy is dissipated by R1 at a rate of 36.0W. If a second resistor R2 = 15.0Ω is connected in series with R1, what is the total rate at which electrical energy is...

Homework Statement Problem: A car's rear window defroster uses 15 strips of resistive wire in a parallel arrangement. If the total resistance is 1.4 ohms, what is the resistance of one wire? Solution: rearrange formula to $$ R nR_{T} = (15)(1.4 \Omega) = 21 \Omega $$ Question: What is the...

Homework Statement The question pertains to the first problem from this link https://courses.physics.illinois.edu/phys212/sp2014/practice/practice.pl?exam2/fa10 They ask for the value of "I" in terms of V1, V2, R1, and R2. Homework Equations V = IR ∑Vi = 0 [/B] The Attempt at a Solution...

I am confused about the concept of a power dissipation limit for a resistor. Basically for a resistor the product of the current through it and the potential across it should not exceed 0.25 watt otherwise it starts to heat up and act in a non-linear fashion. Is this value just a constant or is...

The following circuit has been modeled using some modelling software (Micro-Cap 11). I was wondering why current is only shown at the source and not in R1, R_Unknown and R3. I know current is meant to be the same in series although I am confused by the effects of the resistors. (This is not a...

Consider the circuit shown in the figure . Suppose the four resistors in this circuit have the values R1 = 12 , R2 = 6.0 , R3 = 7.3 , and R4 = 15 , and that the emf of the battery is E = 18V . (1) Find the current through each resistor using the rules for series and parallel resistors. Answer...

Homework Statement I am able to solve most of the DC circuit problems we're given, but I seem to be missing something conceptually when it comes to finding current that passes through individual resistors when they are in parallel. An example problem would be #10 at this link...

Homework Statement A circuit is constructed with six resistors and two batteries as shown. The battery voltages are V1 = 18 V and V2 = 12 V. The positive terminals are indicated with a + sign, The values for the resistors are: R1 = R5 = 40 Ω, R2 = R6 = 156 Ω R3 = 69 Ω, and R4 = 113 Ω. The...

Homework Statement Look at the circuit given in figure 1. Solve for the three currents, I1,I2,I3. Homework Equations KVL: Sum of voltages in a closed loop equals zero KCL: Sum of currents entering a junction equals the sum of currents exiting a junction Ohm's Law: V=IR NOTE: Nodal analysis...

I feel like have a chicken and egg type of problem regarding internal resistences because of the following problem: The voltage across a battery with internal resistence is given by the equation EMF-Ir=V Given the voltage across the battery then the voltage in the circuit is V=IR So, if I have...

Homework Statement Hi everyone! I'm trying to find the thevenin equivalent for part A of this circuit: http://imgur.com/4Jdg8w8 Homework EquationsThe Attempt at a Solution I first remove part B, that is, open circuit it entirely. Then I try to find Voc across the two terminals that are open. I...

1. A) Find the Effective resistance of a tree of resistors that bifurcates 3 times. B) Find the effective resistance of a tree of infinite resistors. (if the tree below went on to infinity) Homework Equations Ohm's Law The Attempt at a Solution I have no idea how to start this. There was no...

Homework Statement Two resistors R1 and R2 are connected in series to a battery supplying a voltage of ∆V as shown. How much power is dissipated by the resistor R2 in the form of heat? Use the following data: R1 = 10 Ω, R2 = 5 Ω, ∆V = 3 V http://tinypic.com/r/153tr91/8 2. Homework Equations...

Homework Statement A resistor is added to a circuit in parallel.. How does the current through the pre-existing resistor change?Homework Equations V=IRThe Attempt at a Solution [/B] From one viewpoint, I understand, because no matter how many resistors you add to a circuit, the voltage across...

Homework Statement I have available resistors of 5 different values (10kΩ, 22kΩ, 47kΩ, 100kΩ and 220kΩ). How can I choose a combination of these resistors that will create a total resistance of 35kΩ in a U shape (using 5 resistors)? See attached picture of 'U' to get a clear picture of the...

Homework Statement For the circuit below, if L=2.0 H, emf=10 V, R1=10 ohms, R2= 20 ohms, what is the current through each component a) at the instant the switch is closed b)a long time after the switch is closed c) If after a long time the switch is reopened, what is the time constant...

Homework Statement Find the Uncertainty of the Total Resistance of two (2) parallel-connected resistors: R1 = 2.2 kΩ ± 5\% \ ;\ R2 = 1.8 kΩ ± 20\%. Homework Equations We know that resistors in parallel are: \frac{1}{R_t}={\frac{1}{R_1±\delta_{R_1}}+\frac{1}{R_2±\delta_{R_2}}} This...

hi guys I am attempting to solve a problem that has me scratching my head. I have a small connector PCB with one 8k resistor present. The connector is four way with the resistor terminals being the two inner pads. The outer two pads are short circuit together. I solder two wires on the...