| A | B |
|---|
| Circuit board (482) | A collection of hundreds of tiny circuit that supply electric current to the various parts of an electronic device |
| semiconductor (483) | A substance that conducts electric current better than an insulator but not as well as a conductor |
| doping (483) | The process of replacing a few atoms of a semiconductor with a few atoms of another substance that have a differenct number of valacne electrons. Doping changes the arrrangement of electrons in the semiconductor. |
| diode (484) | An electronic component that allows electric current in only one direction |
| transistor (485) | An electronic component that can be used as an amplifier or a switch |
| integrated circuit (485) | An entire circuit containing many transistors and other electronic components formed on a single silicon chip |
| telecommunications (488) | The senting of information across long distances by electronic means |
| signal (488) | Something that represents information, such as a command, a sound, or a series of numbers and letters |
| analog signal (489) | A signal whose properties, such as amplitude and frequency, can change continuously accoording to changes in the orgincal information |
| digital signal (490) | A series of electric pulses that represents the digits of binary numbers |
| computer (494) | an electronic device that performs tasks by processing and storing information |
| microprocessor (495) | an integrated circuit that contains many of a computer's capitiblies on a single silicon |
| hardware (496) | the parts or equipment that make up a computer |
| software (498) | a set of instrument or commands that tells a computer what to do; a computer program |
| Internet (499) | a huge computer network consisting of millions of computers that can all share information with one another |
