puzzle 3

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Across
  1. 4. device that converts electrical energy to acoustic energy
  2. 6. A method used to remove unwanted copper from a PCB.
  3. 7. A device that is used to convert mechanical energy to electrical energy.
  4. 8. The phenomenon in which certain materials generate electric charge in response to apllied mechanical stress.
Down
  1. 1. the effective resistance of an electric circuit or component to alternating current, arising from the combined effects of ohmic resistance and reactance.
  2. 2. This person is credited for finding out the transistor effect.
  3. 3. a passive electrical device that transfers electrical energy between two or more circuits.
  4. 5. a type of capacitor, which is polarised