Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
12 Cards in this Set
- Front
- Back
|
what makes a computer digital?
|
it represents discrete things such as numbers or letters of the alphabet.
|
|
|
what makes a computer electronic?
|
it involves the emissions, motions, and absorptions of electrons in semiconductors, vacuums, phototubes, and gases.
|
|
|
In the electron beam of a CRT computer, how do the electrons travel?
|
relativistic speeds (a significant fraction of the speed of light).
|
|
|
what are some examples of metal conductors in chips?
|
wires, printed traces, and microscopic conductive paths.
|
|
|
what do the bar magnets on floppy disks do?
|
store data
|
|
|
why are computers also electromagnetic devices?
|
some components use visible light, infrared, microwaves, and other regions of the electromagnetic spectrum.
|
|
|
what are some components that use electromagnetic radiation?
|
CD-ROMs, DVD-ROMs, laser and LED printers, digital cameras, scanners, and optical fibers that transfer data.
|
|
|
what components use infrared radiation?
|
wireless networks, keyboards, and mice.
|
|
|
where are microwaves used?
|
wireless networks
|
|
|
what is an analog representation of a number?
|
when the number represented by physical characteristics such as lengths, angles, and electrical voltages or currents.
|
|
|
what is an example of an analog calculator?
|
using two rulers to add or subtract lengths (and thus numbers).
|
|
|
what is an example of a simple digital calculator?
|
an abacus with beads on strings.
|
