Across
- 4. Build up of electric charges on objects
- 5. These are inside the atom with neutrons
- 6. Unit for current
- 7. They are negative and surround the nucleus
- 11. This consists of a power supply, conducting wire, switch and outlet
- 12. What like charges do
- 15. If an atom has equal numbers of protons and electrons the atom is:
- 16. These are neutral
- 18. What turns on lights, TVs and dishwashers
- 21. Unit for voltage
- 23. These materials hold their outer electrons tight to the atom and since they do not release them
- 25. Energy electrons receive to be pushed around wires
Down
- 1. What unlike charges do
- 2. This material is a very good conductor
- 3. An atom with an unequal number of protons and electrons is:
- 8. Materials that allow the flow of electrons
- 9. Power supply
- 10. How many electrons pass a point each second
- 13. What is made when electrons flow between the upper positive parts of clouds and the lower negative parts of cloud creating a spark
- 14. What charge electrons have
- 17. The effort to go against the force of the current
- 19. Metal connection points on the end of batteries
- 20. What makes up all substances and materials
- 22. What charge protons have
- 24. This is an insulator and what containers can be made of