Technology 3 ESO – Unit 9 HARDWARE AND SOFTWARE extra activities
1 – Watch the video on “How Cache Works” and answer:
- a) What is the problem with the cloud? Why?
- b) What for do CPU’s use cache?
- c) What for do web browsers use cache?
- d) Why the “cache drive” makes a copy of the file before sending the file to the cloud?
2 – Watch the video on “How do microphones work?” and answer:?
- a) The dynamic microphone […] work using _____________________ induction.
- b) Sound waves hit a _________ _______________ which causes it to move.
- c) This diaphragm is attached to a _________ surround by a ___________ .
- d) This magnet creates a _____________ _________ around the coil.
- e) The _________ ___________ hitting the diaphragm are moving the coil and the coil’s movement past the magnet creates an _______________ _____________ .
- f) This electrical current is your _________ __________ .
3 – Watch the video on “Why Do Computers Use 1s and 0s? Binary and Transistors Explained.” and answer:
- a) What is “binary”?
- b) How many apples are represented by these binary numbers: I) 10 II) 101 III) 1000 IV) 11001 V) 101011
- c) Why did the computer creators use the binary code?
- d) What is a Byte?
- e) Why ASCII has 255 letters and symbols?
- f) What pattern of transistors do we need to represent “A” in ASCII? What would happen if the last transistor switches from “1” to “0”?
- g) Why “new computers” were designed to recognise two bytes (“16bit code”) as one single number?
- h) Today’s computers normally use the “64bit code”. What do you think that means?