Difference between Impact printer and Non-impact printer

Impact printer Vs. Non-impact printer:

Impact printer		Non-impact printer
1.	A kind of printer whose printing head touches the surface of paper during the printing process.	A kind of printer whose printing head doesn’t make any physical impact on the paper surface during the printing process.
2.	Printing quality is relatively poor.	Printing quality is relatively high.
3.	Printing speed is comparatively slow.	Printing speed is comparatively fast.
4.	It creates more noise.	It creates less noise.
5.	It is less expensive.	It is more expensive.

Inkjet Printer

Inkjet Printer: 

It is another type of non-impact printers. It also from images with little dots. It has a number of noggles. It sprays small electrically charged droplets of ink from the noggles through holes in a matrix at high speed on the paper. The charge ink droplets travel at speed of up to 10miles per hour as they move between a set of plates that deflect the droplets. A stream of more than 100,000 droplets can from approximately 200 characters per second.

Figure: Inkjet Printer

Laser Printer: Working principles, Advantage and Disadvantage

Laser Printer: 

It was the principle of dot matrix printer of creating image with dots. However, these images are created on a drum, treated with a magnetically charged ink like tonner and then transfer form drum to paper.

Figure: Diagram of a laser printer (Wikipedia)

Working principles of Laser Printer: 

A small laser beam is forced off mirror many times per second onto a positively charged drum.

Drum Printer

Drum Printer: 

A drum printer consists mainly of a cylinder drum. The characters to be printed are embossed on the surface. A character is printed by the striking of the appropriate hammer against the embossed character on the surface. A carbon ribbon and paper are interposed between the hammer and the drum.

Figure: Drum Printer

Dot Matrix Printer

Dot Matrix Printer: 

In case of dot matrix printer the printing head makes a physical impact on the paper. Here a set of middles remain arranged in a matrix form in the printing head through wile ink poured up on the paper. While a character is needed to be so that it takes the shape of desired.

Figure: Dot Matrix Printer

Daisy Wheel Printer

Daisy Wheel Printer: 

A daisy wheel printer has removable print wheel consisting of spokes. Each spokes ends with a raised character. The wheel turns to align the desired latter with the next printing position and a hammer strikes the spoke end to print that character.

Figure: Daisy Wheel Printer

Impact printer: Character Printer, Line Printer

Impact printer: 

The type of printer whose printing head touches the surface of the paper during the printing process is called impact printer. It forms characters or images by striking a mechanism such as print hammer for while against the surface and inked ribbon and images on the paper.

Figure: Impact printer

• Character Printer: 

In a character printer, characters are printed one after the others. Only one character can be printed at a time. The character printer is also known as serial printer.
Example:

1. Daisy Wheel Printer
2. Dot Matrix Printer

• Line Printer: 

In a line printer, many character of a line are printed at a time. To the user, the line printer appears to print a complete line of character is one shot.
Example:

1. Drum Printer
2. Chain printer
3. Band printer

Printer

Printer: 

A printer is an output device that produces text and graphics on a physical medium such as paper. Printed information is often called hard copy.

Figure: Printer

There are mainly two types of printer. They are:

1. Impact printer
• Character Printer
• Daisy-wheel printer
• Dot-Matrix Printer
• Line Printer
• Drum printer
• Chain printer
• Band printer
2. Non-impact printer
• Ink-jet printer
• Laser printer

Speaker & Headphones

Speaker:

A speaker is a term used to describe the user who is giving vocal commands to a software program.
A computer speaker is a hardware device that connects to a computer to generate sound. The signal used to produce the sound that comes from a computer speaker is created by the computer's sound card.

Figure: Speaker

Headphones:

Sometimes referred to as earphones, headphones are a hardware output device that either plug into your computer line out or your speakers to privately listen to audio without disturbing others.

Figure: Headphones