2  Astronauts' realm. (9)

 5  Electrical devices (10)

 6  Fix-it guy (9)

 9  A digital display that uses liquid crystal cells that change reflectivity in an applied electric field; used for portable computer displays and watches etc. (6,7,7)

11 A school teaching mechanical and industrial arts and the applied sciences (4)

12 The use of technological communications devices, such as computers and the Internet, to provide public services to citizens and other persons in a country or region. (1-10)

16 A device that produces electricity; may have several primary or secondary cells arranged in parallel or series (9)

17 A substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities (14)

21 Represents information by variable quantities (e.g., positions or voltages)- Type of data processor (6,8)

22 "Juice" (Abbr.) (4)

23 Business conducted online (1-8)

25 A gadget, especially one whose real name is unknown or forgotten. (6)

26 Most definitions say that they run primarily on roads, seat one to eight people, have four wheels, and mainly transport people rather than goods. (11)

27 An artifact designed to be played with (4)

28 Available over the Internet (2-4)

 3  Keyboard, monitor, mouse and other devices (11)

 4  (electronics) graph showing how a particular characteristic of a device varies with other parameters (14,5)

 7  Field of flight technology (8)

 8  Relating to information technology, computers or the Internet (5)

10 Hardware utensils for use in a kitchen (11)

13 Where the information sought is in electronic format (1-9)

14 Domestic utensils, especially for the kitchen (10)

15 Depictions on wiring diagrams (8)

18 "Vision" combination form (4)

19 Assembly line science (8)

20 20th century industry. (8)

24 (computing) a system of electronic message communication via network, esp. the Internet; a message or messages sent or received this way (1-4)