EXTRA CREDIT: DIGITAL ELECTRONICS

1. a metallic alloy of tin and lead that is used to join two metal surfaces
6. a sequential circuit based on a latch whose output changes when its CLOCK input receives a pulse
9. the mental process that learners use to understand and monitor their own thinking and learning
12. an electrical device used to store electrical charge
14. a logic circuit that operates like an AND gate followed by an INVERTER
17. a list of all possible input values to a digital circuit, in ascending binary order, and the output response for each input combination
19. a way of representing some physical quantity, such as temperature or velocity, by a proportional continuous voltage or current
20. a movement of electrical charges around a closed path or circuit
21. a logic gate that changes its input logic level to the opposite state

2. a system for writing numbers using powers of 10, where the exponent is always a multiple of three
3. the process of applying a thin coat of solder to materials before soldering them
4. the opposition to current, measured in ohms
5. the unit of electrical resistance, represented by the symbol Ω
7. CIRCUIT an electronic circuit that has many components, such as transistors, diodes, resistors, and capacitors, in a single package
8. an electronic device that conducts current in one direction only and illuminates when it is conducting
10. a digital signal in the form of a rectangular pulse train or a square wave
11. a printed specification giving details of pin configuration, electrical properties, and the mechanical profile of an electronic device
13. The output of this circuit is HIGH only if its inputs are HIGH
15. a common concept in computer science and information technology in which a lot of the detail of a system or a process is hidden, allowing the user to focus on the details that are important for the task at hand
16. a device for wiring temporary circuits typically used for prototypes
18. an insulating board containing conductive tracks for circuit connections