Infotech Unit 3 Text p. 12

Look at the extracts from the text. What do the underlined words in bold refer to? Think and choose. Mind the timer.

The nerve centre of a PC is the processor, also called the CPU, or central processing unit.  This is built into.....

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This is built into a single chip which executes program instructions.....

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The other (the instruction register, or IR) holds the instruction that is being executed

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The power and performance of a computer is partly determined by the speed of its processor. 

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The programs and data which pass through the processor must be loaded into the main memory in order to be processed. 

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Therefore, when the user runs a program, the CPU looks for it on the hard disk and transfers a copy into the RAM chips.

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......and controllers for peripherals, connected by buses - electrical channels which allow devices inside the computer to communicate with each other.

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For example, the front side bus carries all data that passes from the CPU to other devices.