Crossword related to plant economics and energy mamagment

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Across
  1. 2. the frequency of dc current is ______
  2. 5. energy measurment unit
  3. 6. the energy produced from primary energy
  4. 7. heat combustion/ energy combustion
  5. 8. the basic unit of electrical current
Down
  1. 1. which fuel is a clean and efficient fuel
  2. 3. core component of modern economics enrgy
  3. 4. solar energy is which type of energy