Page 48 - Computer

Computer Science Question photos, original artwork, drawings, and
that will help you to use different
text can all be scanned.
keyboard keys.

Types of scanners
FOR ONLINE READING ONLY
Scanners come in different shapes and

four types: hand-held scanners, flatbed
Did you find any challenges in sizes. They can be categorised into
practising the use of different keys on scanners, drum scanners, and sheet-fed
the keyboard? scanners.

Hand-held scanners
Mice These scanners are held in the hand

A computer mouse is an input device and moved over the material being
that controls cursor movement in a scanned. They are small, portable,
Graphical User Interface (GUI). It can and cheap. They improve efficiency at
be moved and used to select text, icons shopping places such as supermarkets
for files and folders, and menu items. For and bookshops. They are generally
desktop computers, the mouse is placed used with barcodes, such as on books in
on a flat surface, such as a mouse pad bookshops and libraries and on groceries
or a desk. Figure 3.4 shows examples of in supermarkets. Figure 3.5 shows a
mice. hand-held scanner.

(a) Wired mouse (b) Wireless mouse

Figure 3.4: Computer mice

Scanners Figure 3.5: Hand-held scanner

A scanner is a device that is used
to convert a hard copy document to Flatbed scanners
digital form (softcopy). The process of These scanners provide a flat glass
converting a printed format into a digital surface to hold a sheet of paper, book,
format is called scanning. For example, or other documents for scanning.

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for Secondary Schools