Across
- 3. needed to convert digital data into electric currents that can drive motors, actuators and relays, for example.
- 6. screen on which the touch of a finger or stylus allows selection or manipulation of a screen image; they usually use capacitive or resistive technology.
- 10. storage of data in non-consecutive sectors;for example, due to editing and deletion of old data.
- 11. used in DVDs; uses two recording layers.
- 13. number of pixels in the horizontal and vertical directions on a television/computer screen.
- 14. type of touch screen technology. When a finger touches the screen, the glass layer touches the plastic layer, completing the circuit and causing a current to flow at that point.
- 15. storage media with no moving parts that relies on movement of electrons.
- 16. CDs, DVDs and Blu-rayTM discs that use laser light to read and write data.
- 17. needed to convert analogue data (read from sensors, for example) into a form understood by a computer.
- 18. type of ROM chip that can be programmed once.
- 21. primary memory unit that can only be read from.
- 22. high speed memory external to processor which stores data which the processor will need again.
- 23. type of RAM chip that uses flip-flops and does not need refreshing.
- 24. a type of EEPROM, particularly suited to use in drives such as SSDs, memory cards and memory sticks.
Down
- 1. input device that reads physical data from its surroundings.
- 2. type of magnetic storage device that uses spinning disks.
- 4. a type of ROM chip that can be modified by the user, which can then be erased and written to repeatedly using pulsed voltages.
- 5. primary memory unit that can be written to and read from.
- 7. apparatus worn on the head that covers the eyes like a pair of goggles. It gives the user the ‘feeling of being there’ by immersing them totally in the virtual reality experience.
- 8. type of touch screen technology based on glass layers forming a capacitor, where fingers touching the screen cause a change in the electric field.
- 9. type of ROM that can be programmed more than once using ultraviolet (UV) light.
- 12. the lag in a system; for example, the time to find a track on a hard disk, which depends on the time taken for the disk to rotate around to its read-write head.
- 19. type of RAM chip that needs to be constantly refreshed.
- 20. uses movement of electrons between cathode and anode to produce an on-screen image. It generates its own light so no back lighting required.