mr johnsons electricity crossword

2. a particle of matter that uniquely defines a chemical element
3. a device having a designed resistance to the passage of an electric current.
4. the SI unit of power
6. no position feedback of a moving object
8. an electric current that is uni-directional, so the flow of charge is always in the same direction
9. the SI base unit of electrical current.
11. comprises branches so that the current divides and only part of it flows through any branch
15. an electrical safety device that operates to provide overcurrent protection of an electrical circuit
16. equal to atomic number
17. atomic mass-protons
18. a stable subatomic particle with a charge of negative electricity
23. a stable subatomic particle occurring in all atomic nuclei
24. all components are connected end-to-end to form a single path for current flow
25. a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space
26. unit of electrical potential

1. Alternating current is an electric current which periodically reverses direction and changes its magnitude continuously with time in contrast to direct current, which flows only in one direction
5. a container consisting of one or more cells, in which chemical energy is converted into electricity and used as a source of power
7. the resistance that one surface or object encounters when moving over another
10. continuous physical force exerted on or against an object by something in contact with it
12. means that there is some kind of position information that is fed back to the motion controller of a system and that is used in the positioning process.
13. a substance or device which does not readily conduct electricity.
14. electrons are found outside the nucleus
19. an electromotive force or potential difference expressed in volts
20. a watt with 3 0s behind it
21. a passive electrical component that creates resistance in the flow of electric current
22. something that allows metal to pass through it