Electric

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Across
  1. 1. electrical component that can disconnect or connect the conducting path in an electrical circuit
  2. 4. the strength and vitality required for sustained physical or mental activity.
  3. 6. everything is made of this
  4. 8. can hold heat
Down
  1. 2. Heat
  2. 3. does not take in heat well
  3. 5. an interconnection of electrical components
  4. 7. what you hear