Share. LinkedIn. Facebook. Twitter0Every day, we meet all kinds of surprises and unexpected events.
Most of them are of minor importance, but sometimes, they are major, or life shaking events of unpleasant nature, causing difficulties and problems.Life is full of surprises and events that sometimes, shatter one’s daily routine. Some of them might be good and some of them not so good.
Some are pleasant and others unpleasant.Most people like to be in control of their lives, and therefore, are more at ease living the same kind life every day, following the same routine.People feel safer in a familiar environment, doing the same things every day, without interruptions or changes in their daily.How do you cope with surprises and unexpected events?Do you become stressed?Do you panic?Do you get flustered?Do you become angry?There are people, who find it difficult to cope not only with negative experiences, but also with positive ones. For example:.
Keyboard: keydown and keyup. So if we want to track any input into an field, then keyboard events are not enough. There’s another event named input to handle changes of an field, by any means. And it may be a better choice for such task. We’ll cover it later in the chapter Events: change, input, cut, copy, paste. Events Configuration Events are used to trigger actions, such as a command or set of commands. For example, an operator can be notified when a process is complete, or a series of instructions can be executed when a process reaches a certain stage.
Your wife tells you in the morning that she bought tickets for a theater performance, due to take place in the evening. Though you have no plans for the evening, this comes as a surprise, shattering your routine. You want to make a cup of coffee, but discover that you ran out of coffee.
When you arrive at the bus or train station in the morning, to go to work, you find out that the bus or train will be delayed.These are simple situations. However, sometimes, there are other kinds of surprises and expected events, such as:Arriving to the airport, you discovering that your flight is being delayed. During an examination, discovering that you don’t know the answers.
Discovering that there is a leak in the water pipes. Getting fired from your job. Sickness of somebody close to you. Losing money or possessions.
Loss of someone you love.These are just a few instances of surprises and unexpected events. Life is full of surprises and unexpected turns, and if this causes you anxiety and stress, and affects your mind, moods and behavior, you need to find a way to be less affected by them.What can you actually do? Even if you plan things thoroughly, you might be taken by surprise.Even if you live the same kind of life, doing the same habitual things day after day, there could be unexpected events. It is a good idea to be prepared for such events. The best way to handle these situations is to be prepared for them.10 Tips for Dealing with Surprises and Unexpected Events:.Acknowledge the fact, and learn to accept that surprises and unexpected events are part of life and are unavoidable. When you accept this fact, to some extent, it will be easier to deal whatever happens in your life.Life is dynamic, not static.
Change is part of life, and the sooner you acknowledge and accept this fact, the better it would be.The key to everything is your attitude. A is an asset in unexpected situations.Not all unexpected events are negative. Sometimes, what seems like a problem, or even a disaster, could be a blessing in disguise.
A negative event can awaken ambition, motivation, and persistence, which would lead to progress and success.Even getting fired from work, could eventually turn out well, as you might find a better and more satisfying job. A loss or failure can make you search for something better.When making a plan, always have an alternate plan, in case the first plans fail. This would prevent you from falling into a state of helplessness, fear, and not knowing what to do next.Wait for a few moments, before blurting out when confronting unexpected or unpleasant turns of fate. Before getting angry or panicking, look at what happened and assimilate the news. In many cases, this might something of minor importance that is easy to cope with. Maybe what happened is temporary, or something that can be easily fixed.If what happened is irreversible, what good would you gain by becoming angry, stressed or panicked? You would gain nothing.
Instead of getting flustered and confused, angry or feeling helpless, it would be much more useful to think constructively where you are going from there. You need to think how to adjust to the new situation and either fix it, improve it, or make the most of it.Take the initiative, and introduce small changes into your life. Sometimes, in small and not important matters do things differently, without premeditating about them. This will help you cope more easily with surprises and events that are out of your control. In this way, you teach yourself to accept change.
Last updated: June 25, 2019.You might not realize it, but you're constantly on-guard, watching out for threats, ready to act at a moment's notice. Millions of yearsof evolution have primed your brain to save your skin when theslightest danger threatens your existence. If you're using a powertool, for example, and a tiny wood chip flies toward your eye, one ofyour eyelashes will send a signal to your brain that make youreyelids clamp shut in a flash—fast enough toprotect your eyesight. What's happening here is that a tiny stimulusis provoking a much bigger and more useful response. You can find thesame trick at work in all kinds of machines and electricalappliances, where sensors are ready to switch things on oroff in a fraction of a second using clever magnetic switches calledrelays. Let's take a closer look at how they work!Photo: A typical relay with its plastic outer case removed. You can see the two spring contacts on the left and the electromagnet coil (the red-brown copper-colored cylinder) on the right.
In this relay, when a current flows through the coil, it turns it into an electromagnet. The magnet pushes a switch to the left, forcing the spring contacts together, and completing the circuit they're attached to. This is a relay from an electronic, hot-water immersion heater programmer. The electronic circuit in the programmer switches the magnet on or off at preprogrammed times of day using a relatively small current.
That allows a very much bigger current to flow through the spring contacts to power the that heats the hot water. What are relays?A relay is an switch operated by a relativelysmall current that can turn on or off a much larger electriccurrent. The heart of a relay is an electromagnet (a coil of wire that becomes atemporary when electricity flows through it).
You can think of a relayas a kind of electric:switch it on with a tiny current and it switches on ('leverages') another applianceusing a much bigger current. Why is that useful? As the namesuggests, many sensors are incredibly sensitive pieces ofequipment and produce only small electric currents. Butoften we need them to drive bigger pieces of apparatus that usebigger currents. Relays bridge the gap, making it possible for smallcurrents to activate larger ones. That means relays can work either as switches(turning things on and off) or as amplifiers (converting smallcurrents into larger ones). How relays workHere are two simple animations illustrating how relays use one circuit to switch on a second circuit.When power flows through the first circuit (1), it activates the electromagnet (brown), generating a magnetic field (blue) that attracts a contact (red) and activates the second circuit (2).
When the power is switched off, a pulls the contact back up to its original position, switching the second circuit off again.This is an example of a 'normally open' (NO) relay: the contacts in the second circuit are not connected by default, and switch on only when a current flows through the magnet. Other relays are 'normally closed' (NC; the contacts are connected so a current flows through them by default) and switch off only when the magnet is activated, pulling or pushing the contacts apart. Normally open relays are the most common.Here's another animation showing how a relay links two circuitstogether. It's essentially the same thing drawn in a slightly different way.On the left side, there's an input circuit powered by a switchor a sensor of some kind. When this circuit is activated, it feedscurrent to an electromagnet that pulls a metal switch closed andactivates the second, output circuit (on the right side). The relatively smallcurrent in the input circuit thus activates the larger current in theoutput circuit:.
The input circuit (blue loop) is switched off and no current flows through it until something (either a sensor or a switch closing) turns it on. The output circuit (red loop) is also switched off. When a small current flows in the input circuit, it activates the electromagnet (shown here as a dark blue coil), which produces a magnetic field all around it. The energized electromagnet pulls the metal bar in the output circuit toward it, closing the switch and allowing a much bigger current to flow through the output circuit. The output circuit operates a high-current appliance such as a or an. Relays in practicePhoto: Another look at relays.
Top: Looking straight down, you can see the spring contacts on the left, the switch mechanism in the middle, and the electromagnet coil on the right. Bottom: The same relay photographed from the front.Suppose you want to build an electronically operated coolingsystem that switches a fan on or off as your room temperaturechanges.
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You could use some kind of electronic circuit tosense the temperature, but it would produce only small electriccurrents—far too tiny to power the in a greatbig fan. Instead, you could connect the thermometer circuit to theinput circuit of a relay. When a small current flows in thiscircuit, the relay will activate its output circuit,allowing a much bigger current to flow and turning on the fan.Photo: Four old-fashioned overcurrent protective relays pictured at an obsolete power substation in 1986, shortly before its demolition. Photo by courtesy of.Relays don't always turn things on; sometimes they very helpfully turn things off instead. Inequipment and electricity transmission lines, for example, you'll find protective relays that trip when faults occur to prevent damage from things like current surges. Electromagnetic relays similar to the ones described above were once widely used for this purpose. These days, electronic relays based on do the same job instead; they measure the voltage or current in a circuit and take action automatically if it exceeds a presetlimit.
Find out more On this website.Other websites.: A brief account of how Joseph Henry invented the relay in 1835. by Bancroft Gherardi, Bell Systems Technical Journal, July 1932. This interesting historic article from the Bell archives was published to celebrate the centenary of Joseph Henry's electrical discoveries.
It gives an excellent summary of Henry's importance and how he helped to 'switch on' the world to electricity during his lifetime.Videos.: A fairly simple 2.5 minute video guide shows you how to wind your own electromagnets and mount them on a board to produce your very own homemade relay.: This short and simple video explanation talks you through the stuff I explained up above. Same explanation, slightly different words.Books Simple, practical guides. by Charles Platt.Maker Media, 2015. Experiment 7, investigating a relay, is a great hands-on introduction. You get to open up a relay and play around with the inner workings!.
by Roger Bridgman.New York: DK, 2007. (For younger readers aged 9–12. Includes history, science, and technology.). by Thomas Petruzzellis. McGraw-Hill Professional, 2008.
(Includes some circuits that use relays.)Detailed technical books.by Vladimir Gurevich. CRC Press, 2018. After opening with a brief history of relays, this book takes us throughmagnetic principles, the workings of relay contacts, external design and packaging considerations, and related devices such as reed switches. Later chapters explore variations on the basic relay, including high-voltage, thermal, and time relays.
by Roger Bridgman.New York: DK, 2007. (For younger readers aged 9–12. Includes history, science, and technology.). by Thomas Petruzzellis.
McGraw-Hill Professional, 2008. (Includes some circuits that use relays.)Science history. by Kenneth B. McFarland, 2017. 'Section IV: Relay Race' describes how relays played a key part in the history of telegraphy (and therefore) modern communications.