circuit puzzle

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