1. Which is normally an input device?
- Loudspeaker
- Microphone
- Projector
Check the answer and reasoning
Microphone
A microphone converts sound into data supplied to the computer.
CS / Foundations
Inputs, processes, outputs and storage
A computer system transforms input using instructions and produces output. Storage retains information; processing manipulates it. The same device can perform several roles.
Learning objectives
- Explain inputs, processes, outputs and storage using a concrete example.
- Apply the worked method and justify each step.
- Recognise the limitation described in the final check.
The big idea
A computer system transforms input using instructions and produces output. Storage retains information; processing manipulates it. The same device can perform several roles.
An algorithm describes a method independently of a particular computer. Decomposing a task into input, processing and output helps identify what must be measured and what result is needed.
Worked example
A program reads 4 and 7 and outputs their sum. What is the output?
Follow the solution
The inputs are combined by addition: 4+7=11.
Investigate and explain
Predict the worked result before calculating. Change one input, record the new result, and explain which assumptions still hold.
Use the prediction activity below; a local model appears only where it supports this topic.
Check your understanding
2. A program reads 4 and 7 and outputs their sum. What is the output?
- 47
- 3
- 11
Check the answer and reasoning
11
The inputs are combined by addition: 4+7=11.
3. Is saving a file the same operation as calculating its contents?
- No
- Yes
- Only for text files
Check the answer and reasoning
No
Storage retains a representation; processing computes or transforms that representation.