A computer is an ____ machine which can accept ____ in a certain form, ____ the data , and give the results of the processing in a specified format as information. First, data is fed into the computer's ____. Then, when the program is run, the computer ____ the set of instructions and ____ the data. Finally, we can see the results (the ____) on the screen or in printed form (see Fig. 1 below). A computer system ____ of two parts: ____ and software. Hardware is any electronic or ____ part you can see or ____. Software is a set of instructions, called a program, which tells the computer what to do. There are three basic hardware sections: ____ (CPU), main memory and ____. Perhaps the most influential ____ is the processing unit. Its function is to ____ program instructions and ____ the other units. In a way, it is the 'brain' of the computer. The main memory (a collection of ____) holds instructions and data which are being ____ by the CPU. Peripherals are the physical units ____ to the computer. They include ____ and input/output devices. Storage devices (hard drives, DVD drives or ____ drives) provide a ____ storage of both data and programs. Disk drives are used to ____ and ____ data on disks. Input devices enable data to go into the computer's ____. The most common input devices are the ____ and the ____. Output devices enable us to ____ the finished product from the system. For example, the computer shows the ____ on the monitor or prints the results onto paper by means of a ____. On the rear panel of the computer there are several ports into which we can ____ a wide range of ____ — a modem, a digital camera, a scanner, etc. They allow ____ between the computer and the devices. Modern desktop PCs have ____ ports and ____ readers on the ____ panel.

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