List 6 external parts of a computer system and identify which are output and which are input devices?

Six external parts of a computer system are:

Output 

1. Monitor

2. Headphones

3 .Printer

Input

1. Keyboard

2. Mouse

3. Video web camera

An output device is a computer hardware equipment which is used to receives data from a computer and converts the electronically generated data into a form that can be read by humans.

An input device is a component or hardware that is used to send or feed data  or instruction to a computer for the purpose of processing, storage, display, transmission or outputting. Input devices convert the analog data  of the user to digital format that can be processed by the computer.