Across
- 4. a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane in addition to various smaller amounts of other higher alkanes.
- 7. a stable subatomic particle with a charge of negative electricity.
- 8. an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies.
- 11. the “pressure” that pushes electricity.
- 12. he unit of energy in the International System of Units.
- 13. comprises branches so that the current divides and only part of it flows through any branch.
- 17. a measure of 1,000 watts of electrical power.
- 18. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
- 21. a form of energy resulting from the existence of charged particles (such as electrons or protons), either statically as an accumulation of charge or dynamically as a current.
- 23. the action of one surface or object rubbing against another.
- 24. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
- 26. a device having a designed resistance to the passage of an electric current.
- 27. the force applied perpendicular to the surface of an object per unit area over which that force is distributed.
- 28. an electrical safety device that operates to provide overcurrent protection of an electrical circuit
- 30. a stable subatomic particle occurring in all atomic nuclei.
- 31. a particle of matter that uniquely defines a chemical element.
Down
- 1. the unit of electric current in the International System of Units.
- 2. a particle with an electric charge.
- 3. a body of water or air moving in a definite direction
- 5. a mechanical or electronic device that automatically regulates a system to maintain a desired state or set point without human interaction.
- 6. a control system in which the control action is independent of the "process output"
- 9. a substance or device which does not readily conduct electricity.
- 10. a stable subatomic particle with a charge of negative electricity
- 14. the energy contained within a system that is responsible for its temperature.
- 15. unit of electrical potential, potential difference and electromotive force in the metre–kilogram–second system
- 16. a panel designed to absorb the sun's rays as a source of energy for generating electricity or heating.
- 19. is an object or type of material that allows the flow of charge in one or more directions.
- 20. the amount of energy an item needs to function.
- 22. a path along which the whole current flows through each component.
- 25. an electric current that is uni-directional, so the flow of charge is always in the same direction.
- 26. a device having a designed resistance to the passage of an electric current.
- 29. a combination of apparatus for producing a single electrical effect.