The French Resistance (French: La Résistance) was a collection of French movements that fought against the Nazi German occupation of France and the collaborationist Vichy régime during the Second World War. Resistance cells were small groups of armed men and women (called the Maquis in rural areas) who, in addition to their guerrilla warfare activities, were also publishers of underground newspapers, providers of first-hand intelligence information, and maintainers of escape networks that helped Allied soldiers and airmen trapped behind enemy lines. The Resistance's men and women came from all economic levels and political leanings of French society, including émigrés, academics, students, aristocrats, conservative Roman Catholics (including priests and nuns), Protestants, Jews, Muslims, liberals, anarchists, and communists.
The French Resistance played a significant role in facilitating the Allies' rapid advance through France following the invasion of Normandy on 6 June 1944. The French Resistance provided military intelligence on the German defences known as the Atlantic Wall and on Wehrmacht deployments and orders of battle for the lesser-known invasion of Provence on 15 August. The Resistance also planned, coordinated, and executed sabotage acts on the Nazi electrical power grid, transport facilities, and telecommunications networks. The Resistance's work was politically and morally important to France both during the German occupation and decades that followed. It provided the country with an inspiring example of the patriotic fulfilment of a national imperative countering an existential threat to French nationhood. The actions of the Resistance stood in marked contrast to the collaborationism of the Vichy régime.After the Allied landings in Normandy and Provence, the paramilitary components of the Resistance were organized more formally, into a hierarchy of operational units known, collectively, as the French Forces of the Interior (FFI). Estimated at 100,000 fighters in June 1944, the FFI grew rapidly and reached approximately 400,000 by October. Although the amalgamation of the FFI was, in some cases, fraught with political difficulties, it was ultimately successful, and it allowed France to rebuild the fourth-largest army in the European theatre (1.2 million men) by VE Day in May 1945.
Homework Statement
I understand that voltmeters are supposed to have high internal resistances so that they won't draw much current. However, they are being attached parallel to the resistor anyways and according to Kirchhoff' Law that means the voltage through both the resistor for which we...
Homework Statement
Why is the formula for internal resistance for a charging battery v = e + Ir?
When the battery is supplying I to the circuit I understand why the terminal voltage, V, equals emf - IR (voltage lost by internal resistance), but if a battery is charging, why is the...
Hi every one,
I placed a multimeter probe across the terminals of a 1.5 v alkaline battery and saw 2 M Ohms, I did the same across a mV power supply at 1.5 volts and got little below 1.5 K ohms. I don't understand what makes them have diffrent resistance, and exactly why?
I did this because I...
Our professor has asked us why would a photo diode when shined with light, produce no negative resistance.
So far, the only thing I can come up with is because it is in photo conductive orientation (as opposed to photo voltaic) increasing Dark Current thereby eliminating the negative...
In the given circuit we have to find the output voltage , the voltage drop across resistance RL (RL = 10KΩ) and the current through the zener diode having zener voltage VZ = 50V
By this question I want to be clear about the way to solve circuits with zener diode...please explain the...
Homework Statement
I am currently doing the phy project on length vs resistance of wire. to reduce the power loss in transmission wire, the length of wire must be short, as power loss = (I^2) R... in my experiment , I fixed I (current) ,
now i am asked to find the application of low...
Homework Statement
Model the trajectory of a projectile with an initial velocity v_0 that is subject to the force of drag.Homework Equations
F_{\text{d}} = \frac{1}{2}C_{\text{d}}\rho\text{A}(v(t))^2
v_x(t) = v_{0x} + \int_{t_0}^t a_x(t')\mathrm{d}t'
The Attempt at a Solution
I really...
Hi,
What I have been trying to achieve is learn about signal processing ,particularly filters. Newbie to DSP,so far!
I have 2 signals with me.Voltage and current signals. Both are unfiltered. I have managed to filter out these two signals to remove most of the noise. Now,I want to find the...
Homework Statement
There are two wires:
Wire one looks like --=========--
Wire two looks like ---------------
Do they have the same resistance?
So this isn't actually one of my homework problems, but I'm just debating this with a friend and neither of us can come to an agreement. So...
Homework Statement
The question asks for resistance R of a disk with radius r and fixed width w, whose cross sectional area is variable. Unlike in the picture below, the resistor is not connected to the circuit on the flat ends, but on the cylindrical sides.
Homework Equations...
I am stumped by an exercise in using Laplace transforms to analyze the voltage and current in simple LC tank. My issue is with the correct sign of the voltage across the capacitor ...let me pose the problem.
A circuit consists of a voltage source V, 2 switches, a cap C and an inductor L. The...
Homework Statement
A coconut, with ##m = 2.30 kg##, falls from rest from a tree which is ##h = 35.0 m## high. Take ##g = 9.78 m/s^2##.
1. What speed does the coconut hit the ground? Ignore air resistance.
2. If it actually hits the ground with a speed of ##23.9 m/s##, how much work was...
i am working on a project for a dynamic sculpture
we want the sculpture to be able to sway and our idea includes placing the sculpture on a floating base(almost like a catamaran) , with wind forces the sculpture will sway.
i would like to know how i may model the water resistance/buoyancy...
A cell supplies a current of 2 Ampere, when it is connected to 5 ohm resistance and supply a current of 1.2 Ampere. If it is connected to resistance of 9 ohm, find EMF(electro motive force) and Internal Resistance
In a simple series circuit there is a 12V supply battery, 12μ6 F capacitor, a Resistor, and a 2v drop LED with an imax of 30mA. frequency is 10Hz
Calculate the resistance of the resistor so that the LED just stays on.
Homework Equations
Resistance of Capacitor Xc = 1/2∏fC
P=VI
V=IR...
If a 10 kg mass is in free fall (no air resistance), what force must be applied to slow the object down? (g = -10 m/s^2.) For this question, why is it 200 N and not 100 N? Wouldn't 100 N cancel out upward and downward forces and cancel them out?
Can someone please explain the math of this problem?
-If F is the force of air resistance on an object with mass m moving at a constant velocity, which of the following best describes the acceleration of the object when the force of air resistance is reduced by a factor of 4?
(a) F/m
(b)...
Homework Statement
I was told that I can measure the "resistance" of a capacitor using 3 methods:
1. "The direct method"
R = \int_1^2 \frac{\rho}{A} ds
2. "Ohm's Law"
R=\frac{U}{I}
U=\int_1^2 E ds
E=\rho J = \frac{\rho i}{A}
3. "The analogy between electrostatics and electrokinetics"...
Hi!
Here is my task:
a) Calculate and sketch Iout=f(Vc2), for 0<Vc2<1.5V. (neglect Early effect)
b) calculate output resistance for Vc2=Vc1.
BJT's Q1 and Q2 are in forward active mode, have identical characteristics and same temperature. MOSFET M3 is in saturation. Iin=10μA, Vt=25mV...
Here is the question: You are given a number of 10 ohm 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 10 ohm resistance that is capable of dissipating at least 5.0...
Im not able to get this concept of haemodynamics. Constriction of blood vessels increases arterial pressure but it also increases resistance, so how does cardiac output increase? How can constriction of vessels increase venous return? It incteaes systolic filling pressure but resistance also...
I have worked on an example earlier today. It's the section on BJT Amplifiers.
I have been studying the sub-section on Common-Collector Amplifier. I've come across a rather peculiar formula, which has not been mentioned anywhere in my prescribed textbook besides a worked example.
Here is the...
Hi!
My task is to calculate input resistance for circuit below:
VDD=10V, Vtn=1V, β=1mA/V^2, VA=100V, load resistance RL=20k.
Here is model for AC analysis (DC source and infinite capacitances are short circuits, current directions chosen arbitrarily):
After calculationg input current iin...
Homework Statement
The resistivity of gold is 2.44 x 10-8 Ω m at a temperature of 20°C. A gold wire, 0.5 mm in diameter and 44 cm long, carries a current of 380 ma. The number of electrons per second passing a given cross section of the wire, is closest to:
A) 2.4 × 10^18
B)...
If a planet is traveling through space and distorting space, why does it not slow down? If a boat travels through water and distorts the water it will slow down.
I guess a better way to put it is why does empty space not resist being bent?
If you had a voltage v and wanted to know current, would the current be infinity ? Do we just call it 0 because it is insignifant to find such a useless number because since there is no resistance it would be too high. I figure if r=0 then I = v/0 so infinity?
Homework Statement
Below is a link to the problems, A and B.
http://oi62.tinypic.com/28bgqao.jpg
Homework Equations
For series:
R=∑R_i
1/C=∑ 1/C_i
For Parralell
1/R=∑ 1/R_i
C=∑ C_i
The Attempt at a Solution
I usually don't have any problems when it comes to calculating effective resistance...
I am trying to calculate the maximum current drawn from a capacitor that is connected to a resistor of a very low value (a few mΩ). Because the resistor does not have a large resistance as I've seen with many V/t and I/t graphs for capacitors connected to resistors, where the decay of the curve...
As well-known, the bacteria (particularly E.coli) can gain the resistance against antibiotics. In Wikipedia its mechanism is written:
I would like to know:
1) Are there any OTHER mechanisms for gaining the resistance? Can the bacteria gain resistance when it has got antibiotic, LB broth in...
Homework Statement
what's the difference between case a (photo 1&2) and case b (photo 3 ) ? what can't i use the way of doing case b for case a? p/s : my own working for case a in photo 4
Homework Equations
The Attempt at a Solution
Homework Statement
can anybody help me with this question? my ans is different from the ans given... i need explanation on this ! here's my attempt by the way.
r=pl/a . r=resistance , p = resistivity l=length
r=(1.69e-8)(2pi )(6e-2 +1.5 e-3 )(300) / (pi )(1.5e-3)^2
what's wrong with...
I have recently been learning about the microscope properties which dictates electrical resistance. The main equation (resistivity) in my textbook is:
\rho = 2m/qN\tau where \tau is the time between collisions of electrons with the atoms, q is the charge of the electron, N is the number of...
Homework Statement
A 57.0 kg diver dives from a height of 15.0 m. She reaches a speed of 14.0 m/s just before entering the water. What was the average force of air resistance (e.g., friction) acting on the diver?
What is the force of friction underwater if she reaches a depth of 2.5 m before...
Homework Statement
Two wires A and B are connected in series at 0oC and resistance of B is 3.5 times that of A. The resistance temperature coefficient of A is 0.04% and that of the combination is 0.1%. Find the resistance temperature coefficient of B.
Homework Equations
Rt=R0(1+α0t)...
Homework Statement
Determine the insulation resistance in a coaxial cable of length L, with conductivity, as shown in Figure assume that the current density J is radial direction.
The Attempt at a Solution
so i was wondering if this approach is correct,
consider a sequence of...
Homework Statement
Determine the insulation resistance in a coaxial cable of length L, with conductivity, as shown in Figure assume that the current density J is radial direction.
The Attempt at a Solution
so i was wondering if this approach is correct,
consider a sequence of...
Homework Statement
I have attached a circuit scheme from old textbook. Basically, there are 17 resistors which every has resistance R and we need to find the resistance between points A and B. (I added numbers to each resistor so it would be easier to communicate).
Extra question of mine - is...
Homework Statement
Ball with mass of 0.7 kg and radius 0.15 m is dropped from top of the building 30 m tall. Force of air resistance which acts on ball is given with the equation:
F_r = \frac{1}{2} c S ρ v^2
where
c = 0.5
S = r^2 ∏
ρ = 1.29 \frac{kg}{m^3}
v = current speed.
How tall will...
Homework Statement
An electric iron labelled "240V,2kW".
Find the resistance in the electric iron.
Homework Equations
P=V^2/R
R=V^2/P
The Attempt at a Solution
R=240^2/2000=28.8 ohm
In optoelectronics and other nanotechnology applications (like organic photovoltaics, organic LEDs etc) most layers need to be electrically characterized among other types of measurements. Thus, sheet resistance is measured.
An example are the 4-point-probe resistivity measurements. Yet, what...
Homework Statement
A skydiver drops o¤ an outcrop at the top of a sheer face on a mountain and falls vertically
downwards. Let v(x) be the velocity of the skydiver at a vertical distance x below the drop-off point. As the skydiver falls he will experience a drag force of magnitude...
Homework Statement
A 5.0V battery is attached to an RL circuit. The current is given by the formula: I = V0/R(1-e-t/τ), where I0 is the steady-state current, and τ is the time constant for the circuit.
Using the data table provided, determine τ, R, and L for this circuit.
I(mA) | t(μs)...
Where does ohmic resistance arise from, is it from the collision of the current with the electrons of the wire or is it from the electric field of the electrons of the wire's atoms that cause repulsion force against the flowing current ??
Hello,
I have a pair of bearings (NSK Super Precision Angular Contact Ball Bearings) and was wondering whether I would be able to estimate the power it takes to overcome the bearings resistance when the shaft spins with some given rpm.
Are you aware if this is possible to estimate. Thanks!
Induction heating relies on an ac current to produce a changing magnetic field and hence a conductor will experience a changing magnetic flux. This induces an emf and then a current and thus heat.
Heat generated is P=I^2 * R
From this, it would appear that a very high resistance would lead...
Homework Statement
(I added in the R values for reference)
Homework Equations
GV=I
KCL
The Attempt at a Solution
I am not concerned with the MATLAB portion of the problem, only the setup.
I think what the problem wants me to do is:
1) connect a 1A test current from the...
Grεετings! :smile:
I have some questions about a physics problem. I would appreciate some help with understanding this.
Homework Statement
The task is to plot some graphs for a projectile at different angles, first when neglecting air resistance and then including a formula for air...