Perfect Computer Notes

Printers A printer is an output device that prints characters, symbols and graphics on paper. The printed output is called hard copy. Printers produce permanent documents. Print resolution is commonly measured in dots per inch (dpi). A printer with higher print resolution, that is, dpi will produce higher quality print outs, but it will cost higher too. Types of Printers Depending upon the mechanism of printing, there different types of printers, as follows: 1) Impact Printers 2) Non-Impact Printers 1. Impact Printers An impact printer works like a typewriter. It prints characters or images by striking a print hammer , a typeface or pins against paper and inked ribbon. We can say that impact printers do hit or impact an inked ribbon to print on a paper. Since, impact printers produce print outs by striking mechanism, they make a lot of noise, too. Print quality of impact printers is lower than print quality of non-impact printers. Printing cost or impact printers is l...