circuit puzzle

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Across
  1. 2. converts electrical energy into heat and light energy
  2. 5. supply alternetive to using cells
  3. 6. converts eletrical energy into sound energy
  4. 7. it can cut a circuit
Down
  1. 1. when pressed,it complets the circuit
  2. 3. converts eletrical into movement energy
  3. 4. provides electrical energy for the circuit
  4. 8. lets eletrical curent travel throut it