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ACROSS DOWN 1. The smallest part of a compound that is made of individual atoms. 4. Anything that occupies space. 9. A device used to convert chemical energy into electric energy. A group of voltaic cells connected together in a series or parallel connection. 11. A negatively charged particle. 13. The simplest form of matter. 14. An uncharged atomic particle. 19. A positively charged atomic particle. 21. The opposition of current flow. 22. 6.25 x 10 electrons 23. Strips or bars of metal insulated from each other and arranged around one end of an armature. 24. An electrical path between two points. 25. The outermost ring of electrons in an atom. 26. A device used to convert electric energy into mechanical energy. 27. An accumulation of electric charge on an insulated body. 29. The positively charged structure within a voltaic cell. 30. Permanent magnets, arranged outside the armature. 32. A light emitting diode. 1. An instrument for measuring the properties of an electrical circuit. 2. A material that is both a conductor and an insulator. 3. A flow of electric charge. 5. A unit of measure of the rate of current flow. One ampere equals one coulomb per second. 6. The continuous flow through a component or an entire circuit. 7. An object that is surrounded by a magnetic field and that has the property, either natural or induced, of attracting iron or steel. 8. The effort behind the movement of electrons. 10. A device used to convert mechanical energy into electrical energy. 12. Electrons flow from a negative point to a positive point. 13. Magnet created by passing a current through a coil of wire. 15. The center portion of an atom containing the protons and neutrons. 16. The atomic number is equal to the number of protons (positively charged particles) in the nucleus of an atom. 17. A material used to electrically isolate two conductive surfaces. 18. Current that does not reverse its direction of flow. 20. The smallest part of an element that contains all of the properties of that element. 22. A device or material that permits current to flow through it easily. 28. The rotating part of an electrical generator. 31. The negatively charged structure within a voltaic cell.