quiz-3&4

3. Describe different mouse types and explain how to use a mouse.

Mechanical mouse requires a ball to move the cursor on the screen. to get more efficacies with this type of mice, a flat surface named mouse pad is necessary.

Optomechanical or optical-mechanical mouse is a combination of the optical and the mechanical technologies. It uses a ball but detects the mouse movement optically. It is now the most commonly used with PC.

Optical mouse uses a laser; precisely an optical sensor to help detecting the mouse’s moving. More expensive than the two other types, the optical mouses offer more precision and speed and even can be used on any surface.

To be really useful, the mouse has to be connected to your PC. To transmit data to the computer three types of interfaces can be used:

The RS-232C serial port connects the mouse to the computer through a thin electrical cord using a 9 pin connector.

The PS/2 port do the same as the first interface mentioned but using a 6 pin connector.

The USB interface receives various types of mice through a USB connector. One of these advantages to use the USB mouse is the possibility to plug-and-play (it) in front or in the back of your computer case, when it contains these kinds of port.

Wireless mouse one of the most interesting mouse technologies invented which relies infrared, radio signals or Bluetooth to communicate with the computer. Using no cord, the wireless mouse contains a transmitter to send information to a receiver itself connected to the computer. The wireless mouse is usable from 2m to 10m of the computer.

Cordless mouse uses the wireless communication technology (via infrared, radio or Bluetooth) to transmit data to the computer. And like the wireless, it doesn’t use any cord.

How to use a mouse

Steps

1. Connect the mouse. If you drag it around the arrow on the screen should move around with it. If not, you may have a technical problem. Sometimes the arrow will dart around in spurts, or will move too slowly. The former will require troubleshooting (probably downloading a driver) and the latter can be adjusted in your computer's settings. If this doesn't work, consider using a wrench to open your mouse and remove any broken objects.
2. Mice (more than one mouse) can be used by either hand. If you are left handed, you can just place the mouse on the other side of the keyboard, if it reaches. The mouse will work the same
3. Hold the mouse correctly. For Windows or PC users, place your pointer finger on the left button, and your ring finger on the right button. If your mouse has a button or ‘wheel’ I the middle, your middle finger can operat this, For Mac users, the mouse usually has only one button. Use any of your three center fingers to press the buttom.
4. To click, press the button (usually the left one, when there are two) and promptly release it. It should be a firm, quick tap, and the mouse should be still when you do it.
5. To double click (for opening applications, documents or folders), you must click (the left button) twice in rapid succession. If you have physical trouble with the required speed, your computer can be adjusted to suit your neds.
6. To drag files, press and hold the (left) button, then move the mouse without letting the button go until the file is where you want it to be.
7.  Use mouse gestures. When you feel more confident you may like to set up mouse gestures.
   
   

Tips

• If the mouse isn't working properly for you, you may need to Clean the Mouse Ball if it has one.
• Don't be afraid to ask for help from someone who has been using their mouse for a while. Most people are happy to help.
• For moving the mouse quickly, use your thumb and pinky fingers to 'pinch' the mouse and lift it slightly in order to move it around. The thumb and pinky can also help to stabilize the mouse as you attempt to click with your other fingers.
• If you suffer from arthritis, Carpal Tunnel Syndrome, or just a sore wrist after using a mouse, try the following:
• Use a wrist stabilizer while operating a mouse. This will take a while to get used to, as the brace will require slightly longer finger movements to click.
• Purchase a "vertical" mouse, or a mouse with an attached wrist support. These also have a learning curve, but will relieve stress on your wrist. A "vertical" style mouse can aid in improving blood flow to your wrists.
• Purchase a trackball.

4. Describe various types of touch screens and explain how a touch sensitive pad works.

Resistive Touch screen-type screens lack the clarity of other touch screens but they tend to be very durable and can be used in a variety of environments. Resistive-type screens are the most common in use today.

 This type of touch screen is made up of three sheets; 

• conductive

•  resistive 

  protective layer

For making the touch screen conductive and resistive layer are place together with a space between. This space allows the current to pass through it when finger press the screen. This current receive the information is then processed into the desired action. The upper layer on the glass is protection layer so that it protects the screen from scratches in case of odd resistance.

Advantages of Resistive Touch Screen

1. It has comparatively longer life.
2. It is used in many different ways.
3. It is a very common type of touch screen.
4. It is cheap and so approachable.
5. Due to their durability, they are widely used in commercial zone.

Disadvantages of Resistive Touch Screen

1. It emits less light as 75 % so fails to give sharp image.
2. Its appearance is bulky.

Capacitive Touch screen

As the name describe the type of this touch screen. A thin capacitor or electronically charge sheet is placed on the glass. In response to the finger touch some of the charge from the capacitive layer shifts to the finger.
An interesting myth works over here for the functionality of touch screen. You know that capacitor works with electricity then what is the reason it responses to the human touch. Do you remember that electric shock is given to the human heart at the time of heart failure? This is because many electrons are moving in the human cells. When we touch the capacitive screen some of the charge from the screen travel towards the finger and on sheet it decreases.  This reduction in charge sheet processes the application on touch screen.

Advantages of Capacitive Touch Screen

·         It emits 90% of light ray to make screen clear.