Grade 9 electricity topics 1 and 2

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Across
  1. 2. a measurement of the potential difference
  2. 4. the unit for measuring electrical current; the abbreviation is amp.
  3. 6. A material whose properties lie between a conductor and an insulator
  4. 7. A device used to measure voltage, or electrical potential energy difference
  5. 8. Law where opposites attrac, like repel and neutral attract charged objects
  6. 12. A device used to measure current in a circuit
  7. 13. an imbalance in the number of protons and electrons
  8. 15. materials that allow electric charges to flow through them easily
  9. 17. a continuous pathway for charges to move
Down
  1. 1. The release of electricity stored in a source
  2. 3. An electrical device that resists the flow of electrical current
  3. 5. difference the difference in electrical charge between two points in a circuit expressed in volts
  4. 9. When an object gets an excess or deficiency of electrons
  5. 10. A device that produces electricity. A combination of cells.
  6. 11. Allowing charges to move freely along a connection between a conductor and the ground.
  7. 14. a material that has no electrical resistance when very cold
  8. 16. a device used to "open" or "close" a circuit to control the current through it