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What is a Computer?
A machine A tool A device that ‘computes’ (or calculates) A device that takes our input, makes
calculations based on the data, and returns the desired output
Hardware and Software
Hardware
Physical components of a computer
Visible part of a system
Software
Set of instructions that directs hardware to accomplish a task
The intelligence
Hardware Components
Outside computer case: input/output devices Called ‘peripheral’ devices
Inside the case: processing and storage CPU – most important component Motherboard Etc…
What Hardware Needs in Order to Operate
1. Method for CPU to communicate with it
2. Software to instruct and control it
3. Electricity to power it
Hardware Used for Input and Output Popular input devices:
KeyboardMouse
Popular output devices:MonitorPrinter