CP9

1234567891011121314151617181920212223242526272829
Across
  1. 1. The smallest neutral part of an element that can take part in chemical reactions.
  2. 5. The unit for frequency,
  3. 7. A resistor whose resistance gets lower when light shines on it.
  4. 10. More than one cell joined together.
  5. 11. A circuit in which there is more than one path for the current to follow.
  6. 13. See potential difference.
  7. 15. A particle found in the nucleus of an atom, having zero charge and a mass of 1 (relative to a proton).
  8. 19. Meter used to measure potential difference (or voltage).
  9. 20. A current that flows in one direction only, such as the current produced by a battery.
  10. 21. A type of circuit with only one loop of wire.
  11. 22. A measurement of how difficult it is for electricity to flow through something.
  12. 24. A tiny particle with a negative charge and negligible mass.
  13. 26. Spread out.
  14. 28. The central part of an atom.
  15. 29. The amount (rate) of energy transferred per second. The units are watts (W).
Down
  1. 2. A component whose resistance changes as its temperature changes.
  2. 3. A _______wire is held at or near earth potential (0 V). It completes the circuit to the power station and carries current.
  3. 4. A relationship in which when one variable is multiplied by any number the other variable is multiplied by the same number,
  4. 6. The wire connected to the a.c. supply from the power station. The voltage oscillates between the maximum V in one direction and the maximum V in the opposite direction.
  5. 8. A low-resistance path for electric current to flow to earth for safety if there is a fault in an appliance.
  6. 9. How quickly something happens.
  7. 12. A diode that emits light when current flows through it.
  8. 14. A particle found in the nucleus of an atom, having a positive charge and the same mass as a neutron.
  9. 16. The unit for measuring electrical resistance.
  10. 17. The unit for current. Can be shortened to amp.
  11. 18. Current whose direction changes many times each second.
  12. 23. The unit for measuring charge.
  13. 25. A meter used to measure current.
  14. 27. A safety device containing a length of wire that is designed to melt if the current in a circuit gets too hot.