The parts of a computer
Answers are for parents and teachers.
1
Which unit is each of these? (a) a microphone, (b) a speaker, (c) a disc that keeps files, (d) the part that adds numbers.
(a) input, (b) output, (c) auxiliary storage, (d) arithmetic-logic unit.
2
A pupil types a text and the power fails before saving. Say where the text was and why it was lost.
In main memory, which is temporary and loses its contents without power.
3
In the invented machine: LOAD 4, ADD 6, ADD 1, SHOW. Trace it and say what the screen shows.
Work cell: 4, 10, 11. The screen shows 11.
4
Complete the XOR and AND results: A = 0, B = 1; then A = 1, B = 1.
A = 0, B = 1: XOR 1, AND 0. A = 1, B = 1: XOR 0, AND 1.
5
Explain why a half adder is not enough to add two numbers of several bits.
A column after the first also has a carry coming in from its right. A half adder has no place for it; a full adder takes the extra carry.