
Electrical and electronic principles
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could be the signal from a temperature sensor, which has been analogue to
digital converted. These signals must be in digital form and usually between
0 and 5 V. A computer system, whether a PC or used on a vehicle, will have
several input ports.
The output port is used to send binary signals to external peripherals. A
personal computer may require output to a monitor and printer, and a vehicle
computer may, for example, output to a circuit that will control the switching of
the ignition coil.
1.5.3 Central processing unit (CPU)
The central processing unit or microprocessor is the heart of any computer
system. ...