Personal Security Devices : Get Protected Using Non-lethal Weapons

The situation, at any point of human history, could have never been as much ironical as it is now. Though we are at the peak of human civilization as we say, we have become, unfortunately, more vulnerable to crime than ever.

It is a real jeopardy that we live in one of the safest country as a whole, but at the personal level we are prone to get attacked by thieves, snatchers at any point of time. As a matter of fact, whatever the level of security system is, when it comes to protect individuals, the government is always helpless.

According to reports, every 10 seconds, an assault of some kind takes place around the entire of US. A burglary case is reported every 46 seconds. In general, almost 20 percent of population faces crimes of some kind or other. Amazingly, dog attacks too are frequent as more than 4 million dog bites are reported every year.

So what do we need? Do we think that every time we are attacked a security personal will come out as a messiah. No! No at all. It has to dealt personally. Thus at this level, as a commoner, we need to take some necessary steps on our own to ensure our personal security buying some personal security products.

Pepper Spray : A pepper spray is a must to have, especially when you travel alone down the deserted streets. Its use can help you get rid of any possible attack whether by a thief or a dog which has gone wild. A simple spray can cause burn in the eyes and sneeze giving you ample time to run away to nearest police station. A capsicum spray is advisable for its lethality.

Bulletproof Backpack : Next time when your child steps out for school, don't send him without a bulletproof backpack. Even you need to do the same when you plan to venture out traveling during summer vacations. Look out for the lighter versions.

Stun Gun : Not like pepper sprays which can be used from a safer distance, a stun gun is only effective, rather too effective, when you are within the hugging-distance of the attacker. The terrorizing electric shocks, coming out of this device, will make the attacker fall flat and go inactive in seconds. The effect lasts for almost 8-10 minutes. Enough time to run away, isn't it?

Stun Baton : This too works on give-him-a-real-shock formula. Unlike stun guns, you can use it, from a safe and sufficient distance. Thanks to its long baton, made of metal, which comes with an electric shock head. You know what does a shock head mean.

Some Latest Entries :

Cell Phone Stun Gun : It is one of the many consumer-friendly innovations in personal security devices. The specifically designed cell phone gives the attacker a real shocker giving high electric shocks. What happens next to it you know well.

Personal Security Alarm : Many times, despite having all the personal security devices, it might not be possible to act as expected. Out of fear, you freeze and you feel unable to shout. Here comes the personal security alarm to your rescue! It will shout and yell for you to call others. After few moments so will do the attacker.

So it is the high time you think about your personal security. So just make a quick trip to any law enforcement personnel supply store where you can get these devices. To know more details you can contact the nearest police station too. They will train you to use these devices.

Buying Energy-efficient Refrigerator Made Easy

If you are planing to replace your old refrigerator, then nothing can be more suitable than opting for something which comes with an energy-efficiency tag. The latest models of these cooling products are comprehensively equipped to save the maximum amount of energy.

Apart from saving money and energy, the installation of an energy-efficient refrigerator does many good things beyond imagination. It brings a drastic reduction in the emission of greenhouse gases. Thus employing a cut into the menace of global warming on your part.

Run After the Energy-efficiency : Almost all the models coming with Energy Star tags are capable of saving energy upto 20-25 percent of the total energy consumed by any ordinary one. Reports say such models are 35-40 percent more efficient than the old models.

Small is Beautiful : If you really want to save energy then nothing is better than a refrigerator smaller in size. Not only that it acquires less place, it needs less money to be spent on its maintenance. Studies say that any refrigerator under 25 cubic feet is sufficient enough to fulfill all the needs of every home.

Big is Not Big Always : Why I request you not to buy a refrigerator bigger in size? In any big size model, the most of the area assigned to freezers are covered by hardware. Also, it gets smaller all because of the icemakers. So where is the place promised by the household consumer appliance manufactures? This is the answer.

Locating the Freezer : Experts always warn us to refrain from buying the models which have freezers located to their sides. They consume more energy than the models having the freezers to their bottoms. You may also consider buying something with a freezer at its top.

Too many Features Spoil a Refrigerator : The market is flooded with refrigerators carrying numerous features to lure the consumers. Here if you really want to return with an energy-efficient model then you better don't pay heed to these features.

They make a mess of your energy saving plans. Also they tend to get corrupted easily so additional burden on your pocket. Thus avoid features such as ; undercounter drawers, icemakers etc.

Heavy Hinges : The refrigerator which has heavy door hinges proves to be more efficient one. The reason..The good seal made by such hinges on the door doesn't allow the cold air to leak out.

One is Better Than Two : This one is important, if you need two refrigerators of smaller size then it advisable to buy a bigger one rather than going for two small ones.

Understanding Transistor, Its importance And Its Versatilities

Invented by Bell Labs, in 1947, a transistor is a solid-state electronic device which is used to regulate the electricity flow. Basically, it is a semiconductor device which consists of three-four layers. Some basic functions like amplifying a signal or opening/closing a circuit is attributed to it.

Its Importance :

The contemporary computer culture has not been at its peak without the invention of transistor. Prior to the advent of this ultra sophisticated electronic active device, all the digital circuits came with vacuum tubes.

Thus the circuits were full of many flaws and drawbacks. Their larger size needed a bigger amount of energy. It used to get heated too early leading to its premature destruction. This led to the increased inefficiency of computers.

However, the transistor gave the computers a lifeline. It became an unavoidable part of the computer mechanism. Thus in any modern computer more than a million transistors can be found.

Some Important Types :

Bipolar Transistor :

As the name suggests, the bipolar transistor, made of silicon, carries two polarities; n-type and p-type. Thus in a bipolar transistor, the current passes through negative polarity and positive polarity found in the layers made of semiconductors.

Field Effect Transistors :

It can have many types and all are used in different fields and for various purposes. For example ; MOS FETS are used in the digital ICs of microcomputers. While, GaAs FETs are used in satellite broadcasting receivers where these transistors amplify the microwave. At last, the junction type FETs are suitable for any audio equipment's analog circuit.

Determining Size and Shape :

Two factors ; the degree of power consumption and the method of mounting ensure the size and shape of any transistor.

Power Dissipation of a Transistor :

A transistor which maximum collector power dissipation is less than IW is called a small-signal transistor. However, if any transistor which maximum collector power dissipation is more than 1W or equal is called a power transistor. Also a small-signal transistor has very low maximum collector current( 500mA) compared to the same of a power transistor.

Transistor as an Amplifier :

A transistor, while working as an amplifier, uses a small amount of electricity. This small amount of energy is used to control the gate of a comparatively larger supply of electricity. The three basic parts( the base, the collector and the emitter) of a transistor do their assigned work to regulate electric supply. For an electric supply, especially a larger one, the base works as a gate controller device. Then the collector is what we say is the larger electrical supply. And as the name suggests, the emitter is what we get the regulated power from. This system needs a very meager amount of electricity.

Transistor as a Switch :

Also a transistor works as a switch or a binary code for a digital processor. The same three basic parts of a transistor work here to do so. The only difference is that the transistor, unlike using low electricity as for amplifiers, here uses some higher amount of voltage. More clearly, when the switch goes on it needs five volts while it needs less than five volts when it goes off.