Physics revision

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Across
  1. 3. the units potential difference is measured in
  2. 4. earths gravitational field strength
  3. 5. what does an ammeter measure?
  4. 9. poor conductors of heat
  5. 10. what does a voltmeter measure?
  6. 11. what do straight lines in a circuit represent?
  7. 13. how is an ammeter connected in a series?
Down
  1. 1. what carries the electric charge in a wire?
  2. 2. the force acting on an object due to gravity
  3. 6. increase in size when a substance is heated
  4. 7. decrease in size when a substance cools
  5. 8. a measure of the amount of matter
  6. 10. how is a voltmeter connected in a series?
  7. 12. thermal energy