Computing GCSE: The Clock
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Last updated 1:49 PM on 6/28/25
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8 Terms
1
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What is the clock?
The hardware component that synchronizes the CPU.
2
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What is the clock made of?
A tiny quartz crystal.
3
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What does this clock material do?
Vibrates at a constant rate, each ‘tick’ of the clock triggers the CPU to carry out one action.
4
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What is clock speed measured in?
Cycles per second (Hertz).
5
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What does one cycle per second equal?
One Hertz.
6
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What does a higher clock speed mean?
More instructions can be executed per second.
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What is the clock speed of most modern CPUs?
3 Gigahertz (GHz).
8
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Why do some CPUs need two cycles to fetch an instruction?
One to get the instruction, and the second to get the data necessary to carry it out.
Note 
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