What is Resistance: Definition and 1000 Discussions

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. D

    How to calculate the resistance in a combined circuit

    Homework Statement Work out the total resistance of a combined circuit. https://gyazo.com/935b96ff63689e2bff852f29ea48bf90 - picture of circuit layout Homework Equations Rt=R1+R2+Rn... R=V/I 1/RT=1/R1+1/R2+1/Rn... The Attempt at a Solution RT=R1+R2 =100+150=250Ω for the resistors in series...
  2. D

    How to calculate resistance in a combined circuit using V&I

    Homework Statement I am not sure how to calculate the resistance of the circuit and each resistor using voltage and current. I know how to work the resistance out in series and parallel but am 100% how to work it out in combined. Homework Equations R=V/I, 1/Rt=1/R1+1/R2 The Attempt at a...
  3. H

    How to find the power consumed by the light bulb

    Homework Statement (Is the image read-able now? ) The fig 1 shows the relationship between voltage and current when voltage is applied to a certain light bulb. Next, in fig 2, the bulb is connected in series with a 12-V battery and a 5 ohm resistor. Question : what is the amount of power...
  4. A

    100 W and 60W bulb plugged in separately....Which with more resistance?

    Homework Statement If you have a 100 W bulb and a 60 W bulb connected to separate electrical outlets, which will be brighter? Which has more resistance? Explain. 2. Necessary formulas P=IV and (maybe?) I=V/R 3. The Attempt at a Solution I know for sure the 100 W bulb is brighter. However...
  5. I

    Rolling resistance force for a 75gram vehicle

    Homework Statement Estimate the rolling resistance force for a 75gram vehicle with axle friction coefficient of 0.2 if the wheel is 40mm diameter and the axle 2mm diameter. I am having trouble with applying the axle friction coefficient. I could not find a similar problem online. Basically...
  6. D

    Why is my calculated resistance higher than the resistor used

    Homework Statement Why is my calculated total resistance of the circuit higher than the resistor used in series and the theoretical total resistance? In a series circuit I used a 100Ω resistor and measured the current at 1.0v intervals from 1.0-5.0v. At 1.0v the current was 8.70mA using a 100Ω...
  7. ephphatha16

    Resistance of a tungsten filament bulb at 20 C

    I was looking for any credible sources who could reveal the resistance of a normal tungsten filament bulb at room temp 20 C? I heard its cold resistance is about 9.5ohms. Is that the resistance at rtp? Thanks a lot in advance!
  8. dovidu

    Question regarding Hardness and Wear Resistance

    Hello, everyone i always had this question in mind, and also tried to look for answers on the web, but alas! i can't seem to find definite answer! i am currently making a fountainpen nib with a carbide point. the traditional material for fountainpen tipping is iridium + osmium alloy...
  9. J

    Could this bulb resistance problem be modified ?

    Homework Statement Homework EquationsThe Attempt at a Solution The original question given above has been correctly answered by me .The correct option is 2) . Thinking more about this problem made me wonder if there could be a combination of L1,L2,L3(different from that given in the...
  10. N

    Engineering Find the equivalent resistance of this circuit w/o Data?

    Homework Statement Find the equivalent resistance of this circuit between points a and b https://imgur.com/a/LWcIC Homework Equations The Attempt at a Solution I am not sure how to complete this problem without any variables. I tried replacing the numbers with the variables which is what I...
  11. tensor0910

    Engineering Circuit diagram: find the equivalent resistance

    Homework Statement problem in title:Homework Equations 1/Rtotal = 1/r1 + 1/r2...[/B]The Attempt at a Solution [/B] I can get it down to 4 resistors...but the one's I have circled I don't know how they behave. I just need a little kick in the right direction lol. Thank you in advance!
  12. porporking

    How Does Temperature Affect Electrical Resistance in Copper Wire?

    Homework Statement Hi Physicsforum, this is my first post so apology if I make unclear equation. I try to solve this question by pluging t0 as temp. at Valley and t as temp. at Antartitca directly as oppose to setting separate equation. I got different answer than the solution said While...
  13. T

    Calculating Friction & Air Resistance for a Train Game

    Hi there, I am new here so please don't be too hard on me yet and move this post if i placed it in the wrong forum. I am developing a little experiment game and i want the train to drive using real physics, but I am really bad at physics. So my question is is how do I calculate the friction of...
  14. H

    Calculating Resistance - Electrical Circuits & Networks

    Hello! I've took a course about Electrical circuits and Networks at the university, and i found out a problem which is uploaded by my professor, and i think he made a mistake! this is the solution i think that the equivalent resistances are wrong (beside Rab), for example if you look at...
  15. E

    Engineering Part C: Solving Resistance in a Complex Circuit

    Homework Statement Part C of the following problem http://www.chegg.com/homework-help/questions-and-answers/problem-1-find-equivalent-resistance-rab-circuits-figp36-q8156743 2. Homework Equations The Attempt at a Solution Hi, to solve this problem, first i tried to ignore the two resistors...
  16. O

    How to model a non-linear pendulum with air resistance?

    Homework Statement I have found a differential equation that models a non-linear pendulum with air resistance, and now I have data. I've looked at the following site for guidance on how to analyse the data. It compares the motion of a damped spring, and compares it to the motion of a damped...
  17. anorlunda

    Wanted: B Level Explanation of Conduction and Resistance

    Students seeking “deeper” understanding of basic electricity, frequently come with one of the following misconceptions. 1. Electrons are like balls, they start with potential energy and gain kinetic energy. They deliver their energy to the far end of the wire by filling a bucket. 2...
  18. T

    Load resistance and current “draw”

    Hi all, Sorry in advance if my questions are stupid and the answers are obvious. I can see from P=VI why a high power appliance requires more current to function. However looking at ohms law and I=V/R it’s telling me that greater resistance will lead to less current. I've always figured that...
  19. R

    Internal Resistance of a Car Battery

    Homework Statement An automobile battery has a terminal voltage of 12.8 V with no load. When the starting motor (which draws 90A) is running, the terminal voltage drops to 11.0 V. What is the internal resistance of the battery? Homework Equations V= EMF- Ir The Attempt at a Solution I think...
  20. srinaath

    Temperature rise calculation for electrical devices

    There are 2 types of temp rise measurement for electrical devices, 1)resistance type 2) thermocouple type (direct measurement) My query is 1) which method is superior and please explain me the reason. 2) Which gives higher value of measurement? Thanks in advance.
  21. R

    Relationship between material resistance and temperature

    For the material used in a heater plate to generate heat for example, for a given amount of power (say 4.5 kw) does the higher resistance of the material mean it will produce a higher temperature? Or is it the other way around?
  22. O

    Motion of a non-linear pendulum with air resistance

    Homework Statement I need to come up with an equation that would model the motion of a non-linear pendulum with air resistance. [/B]Homework Equations Fc=mgsintheta Fdrag=(1/2)p(v^2)CA The Attempt at a Solution I started with mgsintheta-(1/2)p(v^2)CA=ma After substituting v=r*omega and...
  23. B

    Calculating rolling resistance force and coefficient

    I am comparing three brands of tires to see which one provides the lowest rolling resistance and thus give the best efficiency at low speeds. I have the information of the tires such as footprint, weight (of the tire and load), speed. How would i go about doing this ? am really stumped thanks
  24. A

    A Galvanometer of Coil Resistance 50 Ω Deflects Full Scale....

    Homework Statement A galvanometer of coil resistance 50.0 Ω deflects full scale for a current of 3.50 mA. What series resistance should be used with this galvanometer to construct a voltmeter which deflects full scale for 35.0 V Homework Equations /Known Variables[/B] R1 + R2... + Rn = Rtotal...
  25. L

    Try to determine the resistance of an NTC thermistor

    I am currently using a Wheatstone bridge to determine the resistance of a NTC thermistor(Futher information about thermistor: http://www.apogeeweb.net/article/38.html) and feed the difference to the setpoint (analog potentiometer) as the error signal to a PID controller, giving me a way to...
  26. S

    Which equation is used to define resistance?

    Homework Statement What is the definition of resistance? a. Resistance is the potential difference per unit current b. Resistance is the gradient of the graph of potential difference against current c. Resistance is the voltage required for a current of 1 A d. Resistance is defined by the...
  27. E

    Combined resistance in this circuit

    Homework Statement What is the combined resistance when the switch is closed? Homework Equations IR=V The Attempt at a Solution I found that I1=5.2A and that I2=9.1A. The answers follow suit. Now I thought that calculating the combined resistance with 60/(I1+I2) would be correct, however the...
  28. T

    Thermal Resistance to Centerline

    Hello, Given an infinitely long cylinder with a specified surface heat flux, the thermal resistance of an annular region is given by, R_th = ln(r_out / r_in) / (2 pi L k). When I'm calculating the thermal resistance to the centerline, r_in = 0. Does that mean there is infinite thermal...
  29. W

    Proof of Wheatstone bridge equation

    Homework Statement Prove the following equation: ## \Delta U=\frac {R_1R_4}{(R_1+R_4)^2}(\frac {\Delta R_1}{R_1}-\frac {\Delta R_2}{R_2}+\frac{\Delta R_3}{R_3}-\frac{\Delta R_4}{R_4})E## This is used in Wheatstone bridge Homework Equations [/B] U=RI The Attempt at a Solution This has...
  30. B

    Engineering Calculate the resistance in the circuit

    Homework Statement All resistors are ## R = 10 \Omega## Homework Equations Calculate the total Resistance The Attempt at a Solution all resistors are parallel, so $$ \dfrac{1}{R_{AB}} = \dfrac{1}{R} + \dfrac{1}{R} + \dfrac{1}{R} + \dfrac{1}{R} + \dfrac{1}{R} + \dfrac{1}{R} $$ ## R_{AB} =...
  31. B

    Resistance of a semicircular conductor with a rectangular cross section

    Homework Statement There is a conductor with the square-shaped area. the Radii are r1 , r2 with width b and resistivity ## \rho_R##. Find the resistance R between A and B 2. Homework Equations ##I = \iint_A\vec J \cdot d \vec A## ## \vec J = \kappa \vec E ## ## \vec E = \rho \vec J## ## V =...
  32. yecko

    Equivalent Resistance Homework: Help Needed!

    Homework Statement Homework Equations parallel(two shared nodes in two sides), series resistor(one shared node between 2 resistors) The Attempt at a Solution I can't identify the circuit to be parallel or series in order to get the equivalent resistance. how should I finish the question? (...
  33. E

    What is the combined resistance here?

    Homework Statement [/B] What is the combined resistance in this circle between A and B. Homework EquationsThe Attempt at a Solution Honestly I have no idea what to here, any explanation will be great.
  34. Frankenstein19

    Engineering Short circuit confusion, when is the resistance 0

    Homework Statement [/B] I'm going exercises and I understand that if the circuit is short circuited that R=10 ohm is 0. (Trying to find Thevelin R in all of these btw) But then I ran across this one where when it's short circuited, isc is found using the current divider principle and it's...
  35. Frankenstein19

    Equivalent resistance in a Wye formation

    Homework Statement Find the Thévenin resistance for each of the circuits shown by zeroing the sources. Homework EquationsThe Attempt at a Solution I replaced the current source with an open circuit and I'm left with a wye formation but I don't know how to calculate the equivalent resistance
  36. H

    Find the current I in this electrical circuit

    Homework Statement Homework Equations V = I.R The Attempt at a Solution 6 ohm and 3 ohm are series = b Then b pararel to 9ohm = c = total resistance b = 9ohm c = 9/2 ohm I = V/R I = 9.6/c I = 2,13 A Can you help me? Is it right? My friend's answer is 0,8
  37. M

    Finding output voltage given two resistances and voltages

    Given two sets of load resistances and output voltages: Rload = 108 ohms - Vout = 9.6V Rload = 10 Ohms - Vout = 2.3V Find the source voltage and the output voltage when R1 and R2 are equal. When the resistance is very large, the voltage seems to be around 9.6. My assumption was that then the...
  38. M

    What is voltage when running current through copper plats?

    Hey everyone, I'm hoping that you guys will be able to help me with some calculations. I was on YouTube and came across this: I then began to wonder if I could make a solenoid using bitter disk as in the video, granted no where near as powerful. I would say 1 tesla using an iron core. After...
  39. VSayantan

    Current through an Ammeter in an Electric Circuit

    Homework Statement [/B] It is required to find the current through the ammeter, marked A, in the above figure.Homework Equations ##V=iR##The Attempt at a Solution I've redrawn the circuit as follows - But don't know how to obtain the value ##i_3##
  40. M

    I Physics? Setting up PDE for air resistance at high velocity

    Not sure if this is more appropriate for physics or for differential equations, but this problem centers around an airplane traveling with air resistance. I am not looking to get the most realistic-possible model, as it is just for a video game I am making. Although this is technically a PDE...
  41. P

    Need to Find the Total Resistance

    Given the circuit, I am supposed to find the total resistance, but I am unsure of what to do without having a voltage or current source with an internal resistor.
  42. lekh2003

    How Much Current Should Flow Through My Electromagnet Experiment?

    Homework Statement [/B] I am working on a lab report regarding the creation of an electromagnet using an iron core solenoid (just a nail wrapped with copper insulated wire). Before continuing with the creation of the electromagnet, I had to answer some questions regarding my knowledge of...
  43. H

    Calculate resistance between terminals 1 and 2, 1 and 4....

    Question Calculate resistance between terminals 1 and 2, 1 and 4, 1 and 3, 2 and 4, 3 and 4, and 2 and 3 My attempt of solution: For R between 1 and 2 i done: (R1 + R2) || (R1 +R2 + R3) The problem is: Im not sure how to find which is in series and what's in parallel so I'm confused and I...
  44. M

    Question about output voltages and impedances

    Homework Statement 1. For the first measurement, a load resistance Rload = 119Ohms results in an output voltage V(OUT) = 11Volts. For the second measurement, Rload = 11Ohms results in an output voltage V(OUT) = 3.2Volts. From these two measurements, determine the output voltage V(OUT) when...
  45. G

    How do you find the current going through a weird circuit?

    Homework Statement Homework Equations at point C: i2 - i3 - i4 i2 = i3 + i4[/B] The Attempt at a Solution I labeled all the currents going through each resistor in the picture[/B] for loop ABC: 2000i1 = 3000i2 + 4000i3 for loop BDC: 3000i5 = 2000i4 + 4000i3 at point C: i2 - i3 - i4 i2...
  46. D

    Can low Resistance affect the torque output of an electrical motor

    I've had a side project in mind for a while involving motorized Rollerblade wheels, however I need to figure out a motor size that would give me the needed torque to actually accelerate 250lbs up to 25mph. I realize even a 5hp electric motor is large but I was wondering if ohms have any affect...
  47. M

    Questions about finding dBm values

    Homework Statement 1. A sinusoidal source with RMS voltage V = 11Volts across a resistor R = 50Ohms, determine the dBm value. Hint: you will first have to determine the power delivered and then check the formula for dBm calculations. 2. A type of coaxial cable has a loss of 12dB/100m at some...
  48. Y

    Equivalent Resistance of Figure

    Homework Statement https://imgur.com/a/aVCeU Homework Equations (1/Req) = (1/Rv1) +(1/Rv2) Req = Rv1 + Rv2 The Attempt at a Solution I'm not sure which formula is the correct one to use.So.. I'm absolutely stuck. I tried downloading a bunch of circuit board simulators, but I couldn't find an...
  49. M

    The resistance of a thermistor

    Homework Statement The resistance of thermistor over a limit range of temperature is given by equation R=c/(T-203). Where c is constant ant T is absolute temperature. What would be temperature on centigrade scale of thermistor at absolute temperature T=300k? Homework Equations i)R=c/(T-203)...
  50. C

    Expressing y(t) including the effects of air resistance & gravity

    Homework Statement [/B] Hi everyone! So I've got this similar problem as I posted yesterday, but this one is slightly different due to the presence of gravity: A particle in gravitational field ##~~g## starts traveling upward (positive direction) along the y-axis from ##~~y=0## with the...
Back
Top