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.
Summary:: Current through a certain resistor in a mixed dc circuit.
Hi, Sorry if this is the wrong forum.
I'm trying to work out the current through R1.The answer I need is 2 Amp, which I have confirmed with a simulation software.
I have calculated the source current as 8A, the current past...
I'm trying to solve this problem using an rtz coordinate system, and Newtons second law. I know that mar = (m(v)2)/r. I'm failing to understand how mg and the drag force affects the solution and how I would set it up. I know if it was at the bottom of the circle that mg would be added to the...
Hi,
I am trying to find the insulation resistance of a specific capacitor. I've posted on balancing resistors before and got some pretty helpful information. The previous datasheet gave the information in a different manner though. I'm hoping someone can help me decipher the insulation...
Homework Statement:: A K-type thermocouple is connected as shown to sense temperature. The temperature zone is at 25°C. The RTD has a resistance of 100 at 0°C and a TCR coefficient of 0.00385. A 5V power supply drives the circuit. Calculate R2 for proper compensation. What is the emf produced...
R1 = 2 ohms ; R2 = 2 ohms; R3 = 1ohm
First figure:
I need to calculate the resistance between: a) A and C and b) A and B
a) R1 and R3 are in series => R13 = R1 + R3 = 3 ohms
R13 and R2 are in parallel => 1/Rp = 1/R13 + 1/R2 => Rp = 1.2 ohms
b) Here, between A and B there is only R1 so the...
Since both cylinders have the same material, this implies the density is the same. Length is also the same based on the question. We only need to compare the radii for resistance.
R2 = pi ((2b)^2 - (2a)^2)
R1 = pi (b^2 - a^2)
R2/R1 = 4, so my answer is C. But, the given answer is A.
Where did I...
I suppose the trick in this question is to realize that the drag acts in opposite directions when the ball ascends and descends and that the ball actually takes less time to rise and more time to fall than normally. I make a small sketch of the problem alongside.
Attempt : The total time of...
The attached image (Horowitz & Hill Student Manual for 2nd ed) gives thevenin resistance and voltage for the network R_1+(R_2||R_L) as
R_th=R_1||R_2
E_th=E_in(R1/(R_1+R_2)) E_th is self-evident (voltage divider) but how in the world they get R_th i beyond me. If there is no load, isn't R_1 in...
I was researching what the total electrical resistance of the human body was and got some quite far ranging values. It seems to range from 1, OOO to 1OO,OOO ohms. Some quite elaborate ways of testing it too.
Then I thought I'd just get the old multimeter out. I have two and both measured about...
I have a burned stator for a PM generator mounted in the accessory case of an internal combustion engine. The stator has 2 sets of 5 coils creating 2 20 amp generators. I am using a lithium battery and the engine builder blames the battery for the burned stator. He says the lithium battery...
I am doing a physics lab where we are supposed to calculate air resistance and find the impacts of velocity and cross sectional area on air resistance. For the experiment, we rolled a cart down a ramp and measured data using Pasco Capstone software. When rolling the cart down the ramp, we...
A return path for the current was provided by the ocean itself.
Given that the resistivity of seawater is about 0.25 ohm-meter,
see if you can show that the resistance of the ocean return
would have been much smaller than that of the cable. (Assume
that the electrodes immersed in the water were...
I figured that when you close the switch the current from the upper cell will travel through the closed switch due to it being the path of least resistance, essentially the resistor between cells is unused (was my first thought). I'm not entirely sure how to progress with this question.
When we have electrical resistance it is based on dissipation of energy, when we have reactance it is a consequence of charge accumulation in capacitance. Together they form impedance. But let's consider what exactly is responsible for dissipation in case of resistance? Is not it because of...
Hi all,
I've been trying to follow a question I came across on a website. And I'm able to understand everything up until the separation of variables for solving the differential equation and coming to a solution with arctan. But there are a few things that aren't explained that I was hoping...
So, I simply used the percentage increase formula for the resistance force, but what I come up with is a 9.5% increase, as opposed to the 44% it should be...
Here's my procedure:
Hi,
I'm trying to solve this integral and then isolate V, but I can't get the right answer. I don't know where is my errors. I probably muffed the integral.
##-bv -cv² = m\frac {dv}{dt}##
##
\int_0^t dt = - m \int_{Vo}^v \frac {dv}{bv+cv^2}
##
I get this after the integration
##t =...
I considered that the lengths of pi/4 and 3pi/4 would be in parallel:
1/R = 1/30 + 1/10
R = 7,5 ohm
But the answer is 30 ohm. Where am I missing and how do I calculate the potential of the voltmeter.
Dear all,
I have a very simple question. The rolling resistance (rr) of, say, a car, is defined as being proportional to the normal force/weight of an object. That seems reasonable:
##F_{rr} = C_{rr} \times F_N##
The coefficient C_{rr} is a constant, depending on the materials. But now a...
Say that I have a round object on a table and it is still. If I apply a force and it doesn't move the resistive force is rolling resistance rather than a frictional force right?
Now I must be able to apply forces in different amounts until it exceeds a boundary for the object to move similar to...
How would we calculate the Thevenin's resistance for the above circuit? The right answer for this circuit is 1.5 kOhm.
$$R_{567} = R_7 + (R_5 \parallel R_6) = .5 + .67 = 1.2 k\Omega$$
$$R_{34567} = R_3 + (R_4 \parallel R_{567}) = 1 + .75 = 1.75 k\Omega$$
$$R_{TH} = R_1 + (R_2 \parallel...
Not sure what I can do to proceed on here: Should I be using the Delta to Y transformation? Wouldn't be able to simplify using simple series and parallel circuits, and hence am looking for any clues I might need to solve this problem.
PS: ForDelta to Y transformation, it seems that the 10 and 8...
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...
I have conducted an experiment which involves measurements of the velocities of a carriage moving in a straight line which has 4 polyurethane caster wheels attached to it. (The kind you can get a hardware store.) In one phase of the test the carriage is pushed at about .1 meters per second. In...
I don't know if this is a dumb question, but I just can't seem to wrap my head around it.
I can imagine and feel when I'm pressing against a wall, that there's a force. Especially when the wall is not moving, I can continually increase the strength of my push and feel a greater resistance from...
Hello,
i am currently working on a project where i have to calculate the internal resistance of a battery based on the voltage drop caused by placing a resistor over the battery. I am an EE, and i understand how i can calculate the IR by schematic, but i found this equation:
((Open circuit...
By the use of symmetry, I have found that equal currents will flow through opposite edges like A-C and C'A', but still, the use of kirchhoffs current and voltage laws lead to four equations in four variables which I am not able to solve, neither I am sure that the four equations which I have...
This was an exercise from the 2011 admission test of an university from Brazil:
40 identical generators with electromotive force 1,5V and resistance 0,25 Ohms and one resistor with resistance 2,5 Ohm are associated in such a way that the 2.5- resistor dissipates the greatest energy per second...
I start from far right:
Green and blue are parallel Connection:
This in turn is in series connection with black resistor:
and so on ...
This is what I'm ending up with
My final equivalent resistance is (275/17) Ω. Is this correct?
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...
Hey,
I am working on a video game in which there will be archers who have the ability to shoot at enemies. My game is two dimensional and I am trying to calculate the angle at which the archer, given an initial velocity, has to shoot in order to hit the target perfectly. I came up with the...