What is Protection: Definition and 134 Discussions

Protection is any measure taken to guard a thing against damage caused by outside forces. Protection can be provided to physical objects, including organisms, to systems, and to intangible things like civil and political rights. Although the mechanisms for providing protection vary widely, the basic meaning of the term remains the same. This is illustrated by an explanation found in a manual on electrical wiring:

The meaning of the word protection, as used in the electrical industry, is no different to that in everyday use. People protect themselves against personal or financial loss by means of insurance and from injury or discomfort by the use of protective clothing. They further protect their property by the installation of security measures such as locks and/or alarm systems.
Some kind of protection is a characteristic of all life, as living things have evolved at least some protective mechanisms to counter damaging environmental phenomena, such as ultraviolet light. Biological membranes such as bark on trees and skin on animals offer protection from various threats, with skin playing a key role in protecting organisms against pathogens and excessive water loss. Additional structures like scales and hair offer further protection from the elements and from predators, with some animals having features such as spines or camouflage serving exclusively as anti-predator adaptations. Many animals supplement the protection afforded by their physiology by burrowing or otherwise adopting habitats or behaviors that insulate them from potential sources of harm. Humans originally began wearing clothing and building shelters in prehistoric times for protection from the elements. Both humans and animals are also often concerned with the protection of others, with adult animals being particularly inclined to seek to protect their young from elements of nature and from predators.
In the human sphere of activity, the concept of protection has been extended to nonliving objects, including technological systems such as computers, and to intangible things such as intellectual property, beliefs, and economic systems. Humans seek to protect locations of historical and cultural significance through historic preservation efforts, and are also concerned with protecting the environment from damage caused by human activity, and with protecting the Earth as a whole from potentially harmful objects from space.

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  1. Q

    I Looking for a formula for damage when sliding to a stop

    The context is going down a hill in rollerblades: when people fall and they come to a quick stop (due to not having protective gear and there being lots of friction), they always end up with major injuries, while people with protective pads can sometimes fall and slide for 60+ feet and often be...
  2. Victor Aires

    Designing a Thermal Protection System for Spacecraft: Where to Begin?

    Hello, I want to learn how to design a spacecraft's thermal protection system. But I don't know where to start. Someone can help me?
  3. lukakopa7

    Battery protection circuit board

    Does anyone know a cheap(available on Ebay/AliExpress ) battery protection circuit board that has undervoltage/overvoltage protection and charging capability? I have a 3.7v Li-po battery and I need to draw 5 Amps from it.

    Inductance in lightning protection

    A high frequency wire dipole antenna installed at 80 feet is fed with a balanced line, at the transmitter feed point is a 1:1 balun that the balanced feeline hooks to on one side, a tuner on the other. The 1:1 balun is 12 parallel turns of #12 around a ferrite core. The input to the balun has...
  5. JCR103

    Does "Reference Man" promote a gender bias in radiation protection?

    I came across an academic article by Mary Olson entitled "Disproportionate Impact of Radiation and Radiation Regulation" (https://www.tandfonline.com/doi/abs/10.1080/03080188.2019.1603864). Based on data in BEIR VII, she illustrates that women are more sensitive to ionizing radiation than men...
  6. hilbert2

    Medical Natural compounds for radiation protection

    The "sleep hormone" melatonin, sold at health supplement stores, has been found to prevent radiation sickness from ionizing radiation: https://pubmed.ncbi.nlm.nih.gov/30073934/ There are also some other references for this findable with a Google search. But you don't want to be on melatonin...
  7. S

    Android: API to control battery protection mode?

    My new Lenovo tablet has a "battery protection mode". This is useful for example when you want to leave it on charge almost permanently, in which case the protection mode will charge and discharge between 40% and 60% in order to maximize battery life. Is there an API that can enable/disable...
  8. C

    Fire protection -- Water in a cylinder pressurized with Nitrogen

    I wondered if anyone could help, I work in the fire protection industry. We currently have a project using a pressurised cylinder. The cylinder hold 200 lites of water plus 40 litres of nitrogen gas as a propellant at 10.0 bar. I’m trying to work out once the 200 litre water volume has been...
  9. BillTre

    Cats, Mosquitoes, and Silver Vine: A Tale of Euphoria and Protection

    From a Science mag news article. It can also affect non-domestic cats: Apparently, nepetalactone is known to have mosquito repellent properties (similar to DEET). Not that surprising if its supposed to protect the plants from aphids.
  10. hagopbul

    An addition to respiratory Personal Protection Equipment

    Hello all : i am asking if there is a class of respiratory protective equipment , that can be installed inside the human body to support the normal PPE and reduce the possibility to getting infected buy some biological agent : as virus size is between 50 to 160 nm , and the first area of...
  11. S

    Supercritical CO2 erosion protection

    Hi. As i understand from what i have read about supercritical CO2 loops a major hurdle is erosion of the materials. especially in the hottest zones of the loop and in thin material sections and zones where the fluid changes direction or expands/compresses. But from the experiments i have read...
  12. Charlie Cheap

    Using a capacitor for RFI protection

    It has been decades since I was in electronics school and I forgot a lot. I was told using copper plug wires could hurt modern electronic ignition parts, and I was wondering if an RFI capacitor (.5 mfd.) would help protect things. I have a 4-cylinder with points that have been changed to a...
  13. theycallmevirgo

    Is it possible to use cathodic protection on metal kitchen sinks?

    Or is that an electrocution hazard?
  14. I

    Star-delta overload protection

    Hello everyone, here I have one problem, which I can not understand, can you please help me? In attachment you will find a basic star-delta diagram, with unreal calculation (Z is not real value, it's just for calculation and understanding the princip of star-delta). According to these current...
  15. M

    Simulate distance protection in simulink

    Hi, I'm learning Electrical engineering, and I'm trying to Simulate distance protection, using matlab/simulink I searched google and it has many documents about this problem, but those only show the result, and also i can't find any simulation file So i have many questions : 1. how to calculate...
  16. FallenApple

    Medical Masculine physical features correlated with cortisol protection?

    There has been studies showing that high testosterone protects against cortisol. Is that why there's also a correlation between height and income? Because extremely competitive high level jobs would easily destroy a normal person's health unless they have high testosterone to protect against...
  17. J

    Accelerator radiation protection program

    Hi everyone, I have this question attached from the ABHP exam in part B you are asked to list and justify 4 major elements for accelerator radiation protection program for this specific facility, I have written some answers which are : 1) ALARA which includes : time distance shielding source...
  18. D

    Can I Double Protect My Outlets with Outlet Surge Protectors?

    Good afternoon, I have installed a whole house surge protector. Can I also "double protect" a few outlets with outlet surge protectors as well? I've read where you shouldn't piggyback surge protectors and didn't know it the additional outlet protectors would interfere with the whole house...
  19. BillTre

    How Will the New Planetary Protection Officer Impact Mars Exploration Protocols?

    There will be a new Planetary Protection Officer soon and changes could be happening at the Planetary Protection Office. The office makes rules concerned with potential contamination of planets with earthly life. This Science news article goes over issues (on both sides) that the office is...
  20. berkeman

    Why don't Marinas have GFCI protection to prevent Electrical Shock Drowning?

    There have been several stories in the news lately about swimmers getting killed by Electrical Shock Drowning (ESD) when swimming near docs in Marinas. The diagram at the following link shows how it happens, but I'm not understanding why electrical service to the docs isn't Ground Fault Circuit...
  21. T

    B A Possible Challenge To Chronology Protection Conjecture?

    Correct me if I am wrong, but my basic understanding of how the Chronology Protection Conjecture (CPC) would work is that, as virtual particles created from the quantum fields of the vacuum would traverse a wormhole and arrive in the past, they would then travel back into the wormhole alongside...
  22. L

    B How Difficult Will It Be to Remove Mars from the Planetary Protection Treaty?

    In light of the strong desire to begin colonizing Mars in the near future, how easy will it be to remove Mars from the list of planets covered by the planetary protection treaty?
  23. Andrew1949

    Potassium iodide and thyroid protection

    Hi, Does anyone know the reason why we use potassium iodide for thyroid protection in case of nuclear accidental event, and not sodium iodide, or lithium iodide ? (as alkali metals can give away one electron) Thanks.
  24. S

    Protection on Step up and Step Down Converter Module Bucks

    In a circuit that I'm building, I have a power source of 5 volts DC that powers various components. A few of them are LED lights and light bulbs. -Background Info- In circuit 1, I have a step up buck "2A DC-DC boost step-up Conversion module MicroUSB 2-24V 3V to 5v-28V 12v 9v 24v"...
  25. EBPoncho

    PET/CT Gamma Ray Protection with Lead Apron

    I was informed I might get a better response by posting to this forum, so sorry for the double post. Hello all, I am currently attending a service course for a PET/CT system for my employer. We have been covering the physics behind the function of detectors and my instructor said something...
  26. marellasunny

    Alternatives to varistors as overload protection at DC motor

    Alternatives to varistors as overload protection at DC motor DC Motor here implies 12V linear actuator w/DC Motor that consumes 2.8A under loading condition. Pretty costly equipment. I'm using a L298N motor driver connected in parallel to run the linear actuator. The motor driver is run by a...
  27. kolleamm

    How do I find eye protection for my laser cutter?

    I recently received a laser cutter however, I cannot find anywhere not even in the manual what frequency it emits. It's a CO2 machine with a 180 watt laser. It's supposed to be able to cut metal. http://www.ebay.com/itm/121881769914 Can someone advise me on eye protection, I don't want to risk...
  28. Falcus

    I Exploring Tachyonic Antitelephone and Chronology Protection Conjecture

    Now, first off I am punching well above my weight here but oh well. I am doing an extended project on theoretical methods of space travel and was doing some brief reading in the middle of writing about Miguel Alcubierre's warp drive for hyper fast travel within general relativity. I came across...
  29. EverGreen1231

    Do Settingless Relays truly improve Protection Ideas?

    I have more of a discussion type question than one about Electrical Concepts (though I suppose it will devolve into that area). I've been doing a bit of reading about settingless relaying schemes and was wondering how they really improve over the traditional methods? The method of Dynamic State...
  30. A

    Star/delta transformer - single phase fault on secondary

    Homework Statement A three-phase distribution transformer is configured as follows: -primary side = star with solidly grounded neutral -secondary side = delta, grounded via zigzag earthing transformer A single phase-earth fault occurs on the secondary (delta) side of the circuit...
  31. D

    Protect Your Amplifier Modules with RF Pre-Amp Protection

    I have these great Mini-Circuits amplifier modules (ZFL-1000LN+) I use all the time that keep getting blown by a nearby HAM radio operator. Can I protect the input to this module by soldering two anti-parallel fast switching diodes from the input connection to ground?
  32. S

    Why am I getting "is inaccessible due to its protection leve

    Visual Studio is giving me the error Error 1 'System.Data.Entity.DbSet<Survey.Models.Survey>.DbSet()' is inaccessible due to its protection level c:\users\jamin\documents\visual studio 2013\Projects\Survey\Survey\Models\SurveyDbModel.cs 83 40 Survey on the line...
  33. B

    Is early streamer protection recognised by IEC / EN 62305?

    Hi, I need to calculate the radius of the protected area that is provided by an early streamer emission protection system according to IEC / EN 62305 standard but after hours of research I am starting to think that it is not even recognized by IEC / EN standard. So, is it?
  34. A

    Q: Personal magnetic fields: Protection from space radiation

    I have no idea how lethal/strong space radiation is, but i do have an idea that most of it is from the sun perhaps? I also know that the prime factor to deflect this radiation is magnetic field and the ozone layer. I think the magnetic field handles only particle radiation and atmosphere handles...
  35. A

    Data Exclusion Protection in Windows -- need solution

    I have installed one app in windows 7 ultimate. When I run .exe file it will open but suddenly message will come like Then i tried to change it in My computer setting that is My computer->properties->advanced system setting->advanced tab->performance setting->Data Execution Prevention->Turn on...
  36. anorlunda

    Faraday Cage For Lightning Protection

    A recent thread talked about a radio inside a metal box. That reminds me of a question I never resolved. 9 years ago my sailboat was struck by lightning. 6 people were on board, but nobody was hurt, luckily. My mast is grounded to an underwater plate via a thick copper cable inside a plastic...
  37. Helmet

    Developing impact protection, kinetic energy diffusion

    Hi, I'm just an average guy here, mostly self educated, and am looking for experts to verify my theories on developing revolutionary impact protection. If I disrupt direct impact to the head using a highly elastic layer of material, does that create an inelastic impact interruption? A helmet...
  38. mattyboson12

    MATLAB MATLAB, NASAs thermal protection system

    Hi, I am writing program to model the heat flow through different space shuttle tiles. I have got it working using four different methods: Forward differencing, Backward differencing, Crank-Nicolson, DuFort-Frankel and all four methods give me similar results. What are the advantages and...
  39. mattyboson12

    Space shuttle thermal protection tiles

    Hi, I am writing a MATLAB program to model the heat flow through space shuttle tiles. Does anyone know where I can find the thermal conductivity, density and specific heat of the different tiles on a space shuttle?
  40. Y

    Speaker protection using LM311

    Hi all. I am using LM311 comparator to design a speaker protection circuit. I read quite a few data sheet of LM311. Seems like it's such an old IC that they assume people know the IC already. I happen to be a first time user and I am not sure I design it right. Mainly strobe pin #6. From...
  41. B

    Current transformer for protection question

    Homework Statement Determine RR value if the relay current has not to exceed 20mA. Neglect relay resistance. 2. The attempt at a solution I believe the solution is behind Merz-Price theorem, where the voltage system is balanced. CT1 and CT2 are identical current transformers, however, RL2...
  42. V

    Sum of currents in protection relay

    In a differential protection relay there is a setting of a threshold for the sum of amps (or the squares). In what way would that be of interest? The relay is an Areva P521. Also, the relay can display the ratio between the positive sequence current and the negative. What information does that...
  43. F

    Protect Your Home Theater System: Choosing the Right Power Surge Solution

    Hi, i have a 50" plasma TV with a reciever and a home theater system that I want to protect against power surge and anything else needed. I've read about stabilizers, power conditioners and line filters, but i don't know the difference between them. They all seems to do almost the same things...
  44. W

    Calculators Microsoft OS Updates and Need for Anti-Virus Protection

    Hi all, Do the changes/updates that Microsoft does periodically lower the odds of a virus successfully hurting the system? My knowledge of programming and of computers is limited, but it would seem viruses would have to be designed around the way the OS is setup. Then it would seem that a virus...
  45. L

    ESD protection for floating circuits

    How do you protect a power supply that is floating and not connected to Earth ground. Do you still connect the ESD diodes to ground and Vcc? Are there different techniques.
  46. duhuhu

    Non-Newtonian Fluid as MMOD and Radiation Protection?

    So everyone has made non-Newtonian fluid at some point in their lives (when you mix corn starch and water and get that awesome liquid/solid) well in one of my classes last semester we were asked to think of ways to aid in shielding from radiation and MMOD's (Micro Meteoroids and Orbital Debris)...
  47. A

    How to manage a protection unit under a power plamt

    As an Electrical Engineer, I am employed in a Power company. In this company, they want to create a unit for Protection which cover for both the Generation Department and the Transmission & Distribution Deparment. This is my 3rd month in the company. I was advised to make a plan on how to...
  48. N

    Protection from radiation by earths mag field

    I've heard that the Earth's magnetic field protects us from radiation but am curious as to how this works. I assume it would have something to do with charged particle motion in a mag field because radiation is ionizing but I can't seem to nut out the mechanics behind it. Thanks in advance.
  49. F

    Magnetizing protection (Spiderman 2)

    I just seen the Spiderman 2 movie and *SPOILER ALERT!* Gwen tells Peter to magnetize his webshooters so they won't be damaged by electro's lightning, since his webs seems to conduct electricity. Now, the explanation is that a magnetized object can hold electric charges. How is that...
  50. A

    Engineering Protection Engineer: Choose Generation/T&D/Maint./Ops.

    Hello here, I am an Electrical Engineer. I am to be a Protection Engineer in a plant. Should I choose to be in the Generation Department or in the Transmission and Distribution Department? And between Maintenance and Operations which unit should I be, to be more operational? Thanks in advance...