Let us connect a battery of potential difference V to a wire. There is no resistance. Nothing!
Now the battery creates some potential difference and the charges in the conducting wire move due to the Electric field created in the conductor by the battery. So, as the charge moves, its potential...
In the circuit below, the output is 23 W across the resistor with the resistance 6 Ohm. Calculate the amount of current in all parts of the circuit as well as the polarity and EMF ε of the unknown battery.
Circuit:
My attempt:
I get 6 unknowns with 5 equations. I don't know how to find the...
The voltage source in the circuit below has been switched on for a long time when the switch S switches off. How long will it take before the current coming out of the capacitor has become less than 1 mA?
My attempt:
I am far from sure that my solution is correct. This is because i...
I am not sure how to treat the extra connections K12 and K34.
My first guess would be (R1 and R2) are parallel and so are (R3 and R4) and (R5 and R6) ,so
R_{total}= {R1*R2} /{R1+R2} +.....
Or maybe the behaviour is like this:
(R1, R3, R5) are in series , and (R2 R4 R6) are, thus
R_{total}=...
I really don't have any clue why the total voltage is equal to the voltage drop over the 3 Ω and 2 Ω resistors and independent of the 4 Ω resistor . Does it have to do with parallel circuits?
I honestly don't know how to quite even begin this problem.
Looking at Fig 3-2, the slopes of the graphs are 1/R, and hence where the slopes are 0, we have infinite resistance, in which case current wouldn't flow through that resistor and hence simplify the circuit. So I was trying to find...
From the circuit I have:
##-v_b + v_a + V = 0##
##v_b - V = v_a##
##i_1 = (v_b - V)/R_1##
##I + i_2 = i_1##
##(v_b - V)/R_1 = I + v_b/R_2##
From this last equation I get ##v_b = 10.8## and hence ##v_a = 5.8##.
However, apparently that is wrong. (And hence my answers to #2 were all wrong as...
I am having a hard time solving this. Letting \$i\$ be the current flowing into ##R_3##, ##i_1## the current flowing through ##R_1## and ##i_2## the current through ##R_1##—and the node between R3 and R1 be e_1;
Using KVL and KCL, I've managed to find that
##i + I = i_1 + i_2##
Hence...
I assume that because there is a resistance, the polarity of the voltage must be the same as the charge flow, and thus the current, in order for energy to flow in the same direction.
For instance, could I use the example of a light bulb (the resistor) plugged into AC lines; we know that if the...
Homework Statement:: problem solving
You build a wire by combining an 8 inches copper wire with a 10 inches nichrome wire. If their combine resistance is 10 kΩ, find the cross section area of both wires. The nichrome wire has twice the area of the copper wire.
Homework Equations:: I = V/R...
I am going through "Circuit Analysis for Dummies". On pg 18, it says, "If you calculate the power dissipated as 0.1 watts, then a 0.25-watt resistor can handle this amount of power. A 0.125-watt resistor should be able to handle that amount as well, but when it comes to power ratings, err on the...
Composite materials consist of various components such as moist wood ,how will the internal resistance of this material behave?
If I want to study the resistance of composite materials, which topic should I study?
Hi,
I understand mathematically why using low resistance results in a greater heating effect. Could someone give an intuitive and microscopic picture of why the current contributes more to a greater power dissipation by the resistor rather than the resistance contribution to the power...
Hi there,
I have modelled with MAXSURF a few variations of a prehistoric logboat in order to test a few theories. Now, I am trying to look at resistance-performance over a range of speed. To do so, I need to include a constant drag coefficient without knowing the drag force and velocity (both...
(i) Dividing the rod into thicknesses of dx we get discs of area A with lengths=dx so using (****) we have the resistance of a typical disc (between point x' and x'+dx) as:
(1) ##R(x'dx)=\frac{dx}{g(x)A}##
(ii) Using (1) and (*) and the integrating from a to b of the entire rod we get...
Given that they're all on the same branch, I had assumed that they were in series with one another. But with the middle resistor having being on the middle of three branches, it looks parallel.
Like I said, I have a feeling it's in series (making the answer 3R).
This question is from a past...
Hi! I've been struggling with this.
Original exercise here: Find the value of Iy when R=0. And the value of Vx when R is infinite.
For the first part of the question I did this since R=0:
I've tried to solve this circuit and I get that Iy and I5 are 0 A, and this can't be possible since Iy...
I was reading The Feynman Lectures on physics http://www.feynmanlectures.caltech.edu/I_23.html chapter 23, section 4. In it he derives the equation for current when inductor, resistor and capacitor is connected in series with an alternating voltage source, he derives this equation:-...
Let's assume a 2:1 transformer which has a 100V Source connected on the primary circuit and has no/negligible resistance, on the secondary circuit a 5 Ohms resistor is connected. Using the 'Impedance Transfer/Reflection' method, the primary circuit would act as if there was a 25 Ohms resistor...
[ mentor note: post adjusted to conform to hw template and some spellings fixed ]
1. The Problem
I have some few questions that connect voltage, current and resistance.
Imagine that we have a circuit that consists of a battery (5V), 2 resistors. Now once we close the circuit, battery would do...
Homework Statement
1. A 2.01 uFcapacitor that is initially uncharged is connected in series with a 6.51 kΩ resistor and an emf source with 74.6 V and negligible internal resistance. The circuit is completed at t = 0.
a) Just after the circuit is completed, what is the rate at which electrical...
Imagine you have a vertical pressure head 2m tall with water flowing down to height 0m and emptying. Through this length we have 3 identical tubes of resistance R and length L. Assuming I know the volumetric flow rate(Q) as a function of height, how can I calculate the resistance of each tube...
I'm currently in a undergrad level course of eletromagnetism and my professor found it useful to remember quickly of some relationships that we see in high scool, among them power waste.
I got the formulas, since they're simple and are direct derivated from the definitions of electric current...
i have a drawing of a circuit that converts a signal in range [-5,5] V to a range [0,1.2]V .
i wish to understand how it works..
i have basic knowledge of electricity as an undergraduate in general physics but a bit rusty , thus i am here looking for answers...