Resistance Definition and 1000 Threads

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.

View More On Wikipedia.org
  1. brainbaby

    What is the problem with this output resistance....

    In a common emitter amplifier while analysing its output impedance ..why we consider collector resistance (Rc) in parrallel with output impedance (Ro) of the amplifier...since as they appear in series ..as seen by the KVL equation(which involves Vcc=IcRc+Vce+IeRe)...
  2. V

    Projectile Motion/ Air Resistance Question

    I actually have 2 questions that I am getting stuck on around the same point.. Question 1) An arrow with a mass of 80g is fired at an angle of 30 degrees to the horizontal. It strikes a target located 5 m above the firing point and impacts the target traveling at a speed of 20 meters/sec. If...
  3. A

    Resistance of Electrons in Wire: Factors & Theories

    I'm not sure if this question has already been answered yet. I was curious what factors effect the resistance of electrons moving through a wire? From the formula R = p*(L/A) i see mathematically why but I'm curious to the theoretical. Does an increase in cross sectional area decrease the...
  4. mattyboson12

    Understanding Thermal Resistance in Heat Transfer: An Analysis and Explanation

    Homework Statement [/B] Explain how the concept of thermal resistance can be used in the analysis of heat transfer problems 2. The attempt at a solution So I'm made a few key points but I am not sure if I have answered the question fully: Thermal resistance is a heat property and a...
  5. DevonZA

    Temperature coefficient of resistance

    Homework Statement Homework EquationsThe Attempt at a Solution [/B] 1. A copper rod, 100 mm long and 2.5mm diameter, has a resistance of 340micro ohms at 15degrees Celsius. If the rod is drawn out into a wire of uniform diameter 0.5mm, calculate its resistance at 60 degrees Celsius. Assume the...
  6. T

    Resistors in parallel with a capacitor, total resistance?

    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...
  7. Mantikore

    Rolling resistance, tire tolerance, gas mileage

    A question in regards to rolling resistance. Am I wrong in thinking that not everything you hit on the road with your tire effects your gas mileage? Don't tires have a tolerance in terms of how much energy they can absorb before it effects your traction, therefore effecting your gas mileage...
  8. T

    555 timer IC - Calculating resistance needed

    Voltage = 9.0 V, Current = 20 mA, Capacitor (C) = 10 microF, Resistance before (too high) [R_A = R_B] = 10 k Ohms. In a a-stable oscillator, calculating the resistance needed for two resistors (R_A = R_B) to discharge and charge a capacitor (C) so that a LED does not blow. Currently my circuit...
  9. K

    Conservation of Energy - Max height WITH Air resistance

    Homework Statement A ball (m=0.7kg) is dropped from a height (h=30m). The air resistance force is given by the formula F=kv^2 where k=0.0228 and v is the ball's speed. The ball bounces after a perfectly elastic collision. Calculate the maximum height the ball reaches after the collision...
  10. GoldWing

    How Do You Calculate Net Resistance in a Triangular Network?

    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...
  11. AdityaDev

    Resistance between two junctions in a 2D mesh

    Homework Statement There is an infinite 2D mesh of conducting wire. Resistance between any two consecutive junctions is R. What is the equivalent resistance between any two consecutive junctions? Homework EquationsThe Attempt at a Solution Every junction is connected to four points and one of...
  12. gracy

    Resistance vs Current: I ∝ m/a^2

    Should not there be R (resistance) instead of I (current)in the last line i.e I ∝ m/a^2
  13. D

    Constant power, resistance, work, energy

    Homework Statement Mass car 1200 kg . power car constant 20kw . Resistance car motion 500N. Car passes point X and Y with speeds 10 m/s ,25 m/s. Car takes 30.5 s to travel from X to Y 1. Find acc of car at x 2.considering work/energy find distance XYHomework EquationsThe Attempt at a Solution
  14. P

    Find resistance of inductor in series RLC circuit

    Homework Statement We have a resistor of 350 Ohm, an inductor of 0.15H and a capacitor of 10 microfarad, connected in series to an AC source of voltage 240 V and frequency 50 Hz. The measured effective voltage over the resistor is 180V, and over the system of the both the inductor and the...
  15. A

    Resistance of Light Bulbs in Parallel

    Homework Statement Eight lights are connected in parallel to a 110-V source by two long leads of total resistance 1.6 Ω. a. If 302 mA flows through each bulb, what is the resistance of each? b. What percent of the total power is wasted in the leads? Homework Equations V=I P=V^2/R R. The...
  16. A

    Calculating Total Resistance Without Prefix

    Homework Statement a. What is the net resistance of the circuit connected to the battery in the figure above? Each resistor has the same resistance R. Give your answer as a number times R b. What is the net resistance if the diagonal resistor between nodes A and B is replaced by a...
  17. skepticwulf

    Power, Resistance, Voltage, Current

    Suppose I have a tungsten filament lamp with a resistance 0,32 ohm If it operates on 220V line, its power is P=V^2/R=151250W ! However, If the problem is given like , "you have a 100W with resistance 0,32 ohm what's the current? that'd come up as I=Sqroot(P/R)=17,6A First result doesn't make...
  18. Y

    Modeling Quadratic Air Resistance in 2-D using Mathematica

    Homework Statement I am working on a little project in which I analyze a video I found online and try to determine if it is real of a hoax. The video I am analyzing includes a man throwing a football off of a football stadium (at the very top) and making it into a basketball hoop at field...
  19. D

    Electricity through moving conductive liquid

    We Know that in conductive Solids there are lots of free electrons available & they drift when electric field is applied. Their drift velocity is in the range of mm/sec to cm/sec. Now if we consider any conductive liquid which is flowing & we connect the electrodes in such fashion that the flow...
  20. J

    Why does seebeck plate resistance increase due to temperature?

    I just did a thermoelectric generator from seebeck plate. And when temperature increases, the plate's resistance increases from 12 ohms to 8 M ohms. Why is that and how todeal with it??
  21. SmokeyMTNJim

    Resistance and DC circuit question

    Here is the problem: I have already lost the ability to get the correct answer for AI Homework Statement (a) What is the maximum potential difference that can be applied to the terminals a and b? 33.541 Which resistor will have the largest current? V (b) For the voltage determined in part...
  22. Shinwasha

    Find both the internal resistance of a battery and EMF

    Homework Statement When a nonideal battery is connected to a 3.0-Ω resistor in a circuit, the current in the circuit is 2.0A . When the same battery is connected to a 1.0-Ω resistor in a circuit, the current in the circuit is 3.0 A. What is the internal resistance of the battery? What is the...
  23. AdityaDev

    Charging of resistor with resistance in parallel

    The cell can provide conatant emf ε and initial charge of capacitor is zero. Now current through resistor initially is zero and increases. But the potential difference across the capacitor is always a constant with magnitude ε. then ##\frac{q(t)}{C}=E## So ##q(t)=CE## which implies q is constant...
  24. I

    Calculate resistance from resitivity

    Homework Statement Homework Equations R = pL/A The Attempt at a Solution R(a) = 2x10^-4(0.15)/[pi(0.0005/2)^2] = 152.789 [Ohms] It is slightly off. Is there a subtle point that I've missed? Thank you very much.
  25. A

    Length of Wire Effect on Current and Inner Electric Field.

    >Two wires of the same material are both connected to a 9-V ideal battery. They have the same cross section area but wire 2 is twice longer than wire 1. Compare the following quantities by answering if the quantity for wire 1 is smaller, equal or greater than the same quantity in wire 2. > -...
  26. H

    Conservation of Energy: work done by air resistance on rock

    Homework Statement A 250 gram rock is thrown with a speed of 30.0 m/s. It has a speed of 22.5 m/s just before it strikes the ground. Determine the work done by air resistance. There is also a diagram which yields more information. The rocks path is horizontal and it strikes the corner of a...
  27. S

    Relationship between resistance and heat

    Alloys have higher resistivity than pure metals. In real life, our voltage source ,i.e. battery, is constant. Using the formula H=V^2/R, we get that resistance is inversely proportional to heat. Alloys, in that case, will produce less heat as their resitivities are low, so are their resistances.
  28. beyondlight

    Engineering Transistor circuit: Determine source resistance

    Homework Statement Calculate Rs so that the draincurrent ID = 4 mA. Vad does the gain A become? uo/ui? For the transistor: k = 3 mA/V^2 Vt = -2 V also: R1 = 50 k ohm Rd = 2.2 k ohm C = infinity for signalfrequencies image of circuit...
  29. S

    Find the equivalent resistance (Req) of the simple circuit.

    Homework Statement What is the equivalent resistance between points a and b in the Figure shown. Homework Equations Equivalent of two resistors (e.g R1 and R2)= R1*R2/(R1+R2) Equivalent of two resistors (e.g R3 and R4) = R3+R4 The Attempt at a Solution Step 1: 6, 12 and 4 ohm resistors...
  30. Greg Bernhardt

    Resistance: Documentary on Antibotics

    Last night I watched a good documentary on Netflix Instant called "Resistance". It discusses the issue of antibiotics in human medicine and agriculture. Lots of interesting history with debate about how we've badly mishandled antibiotics. Some heart breaking stories of people who caught an...
  31. L

    What is the constriction resistance for two planar films?

    Hi there, I'm recently doing research on thermal transport in constriction geometries, and want to get the diffusive constriction resistance for two planar films but with rectangular cross section. I have searched for many literature, but all of them are talking about the planar films with...
  32. P

    How can I incorporate wind resistance into my projectile motion calculations?

    Homework Statement I'm currently in computer programming class, and I've finished a project and want to improve on it. We had to figure out how to calculate the gravitational acceleration and time traveled of a projectile to hit a target. I'd like to add horizontal variables in my code, like...
  33. CAH

    Internal resistance proportional to current?

    The terminal voltage and current are measured as the resistance is decresed through a cell with emf and internal resistance. Graph of V (y axis) I (x axis) shows straight line decreasing gradient. 1. Explain why terminal pd decreases as the current increases. is terminal pd the same as...
  34. Sampad Saha

    What will be the total resistance of ideal voltage source?

    If we connect a single resistor in the circuit of ideal voltage source then what'll be its total resistance? ? Isn't it zero? As shown in image .so is it possible that the total resistance of a circuit is 0 Although it has 5ohm resistor!?
  35. B3NR4Y

    Finding New Resistance of a Length of Wire

    Homework Statement A length of wire, length l, is clamped at its midpoint. It is then stretched on the right side, with the left side unchanged, to a length of l (the right side has a length l). The original Resistance of the wire was R, what is the new resistance of the wire? Homework...
  36. D

    Surface Barrier in Type 2 Superconductors

    If a field line is moved into a superconductor it meets resistance. This resistance is modeled by adding an image flux thread outside the superconductor which then attracts the flux thread being moved into the superconductor. Why is this attractive force an accurate model of the resistance a...
  37. shott92

    Aerodynamics -- pitching to find additional aerodynamic resistance

    hi guys i know the title... (sigh not again) and this may be the case but i was hoping one you you clever guys on here could help me to the most apporpriate answer is not. thanks basically we know from skydiving and motorsports if the center of aerodynamic pressure is not equal to the center of...
  38. D

    Estimate the Resistance of a Gold Wedding Ring

    Homework Statement Estimate the resistance of a gold (wedding-type) ring. State clearly all assumptions, and introduce any equations you use. your solution should also include a brief summary of how you approached and solved the problem. Helpful tip: You will have to make certain...
  39. M

    Electrical Resistance between 2 points in homogeneous plane?

    Hi there! Just say I have large square piece of some homogeneous resistive material like graphite. How would I go about determining the resistance between any two given points? Further, just say I supply a voltage across two arbitrary points, can I determine the voltage difference between any...
  40. thankz

    Resistance governed by the speed of the electron?

    a while ago someone posted a fun question calculate the resistance from two points on a grid of resistors going into infinity, now I know the immediate nodes determine the simple resistances between two points but the hard part is calculating the in-between resistances but if the grid stretches...
  41. STEMucator

    How Do You Handle the Negative Gain When Calculating Resistance?

    Homework Statement Calculate ##R_S## given the expression: $$A_v = - \frac{g_m (R_L || R_D)}{1 + g_m R_S}$$ The parameters ##g_m = 1.292 \frac{mA}{V}##, ##R_L = 180 k \Omega##, ##R_D = 18 k \Omega##, ##A_v = 5 \frac{V}{V}##. Homework EquationsThe Attempt at a Solution My question is about...
  42. V

    Resistance and Voltage, switch diagram

    Homework Statement [/B] Homework Equations V=IRThe Attempt at a Solution I said: A>D=F>B=C>G>H=E I assumed higher resistance would lead to higher readings. However here are the answers: H=E>C=B>G>D>F>A Can someone explain to me why this is? As you can see H=E which combined gives a total...
  43. J

    Why do resistors always cause a voltage drop equal to the voltage applied?

    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...
  44. B

    How do I reduce the amount of voltage in a circuit?

    Hi, I'm having a difficult time understanding how voltage is reduced in a circuit. I know the relationship of V= IR, but I still don't understand. I think part of the reason I do not understand is the wording used, and the other part is from experience. For example if I have a fan that only...
  45. P

    Air resistance when moving in the same direction but faster

    Hi all, So after the wind almost blew me off my bike today, something occurred to me. It goes like this: We all know that if we bike in the same direction as the air does, then we will get a little push and it makes our journey easier. Then suppose we get a little adventurous (reckless people...
  46. P

    Why won't any electrons flow through the resistor R2?

    So I was doing a circuit with some friends, and the circuit breaks down such that There is what looks like a parallel circuit, with one branch containing just the wire, and the other branch containing a resistor. The answer to the question shows that the electrons will not flow through this...
  47. S

    Finding the equivalent resistance of an RL cct & step input

    Homework Statement Determine the inductor current i(t) for both t<0 and t>0 for the circuit shown in the attached document"Circuit 1. Homework EquationsThe Attempt at a Solution Before t=0, i=(25)/(3+2) = 5A After t=0, i(t)=i(0)e^(-t/tow) tow=L/R=4/(6/5) However, the...
  48. P

    Equivalent resistance in a complex circuit

    Homework Statement In the circuit shown, R1 = 0.810 Ω, R2 = 8.10 Ω, R3 = 81.0 Ω, and R0 = 810 Ω. See attachment Calculate the equivalent resistance of the circuit when a 7.70 V power supply is connected between points A and C. Calculate the current through R0 and R1 Homework...
  49. C

    Measuring the resistance of a button

    I need to measure the resistance of a button on a car steering wheel, so my question is: how do I measure the resistance of a steering wheel button using a digital multimeter? I don't currently have the steering wheel installed yet, so can I measure the resistance of the buttons without the...
Back
Top