Across
- 3. has a limit
- 5. relates to movement
- 8. relates to money
- 9. can be replaced
- 11. a particle of light
- 13. capable of working
- 16. able to be maintained
- 17. relates to sun
- 18. A unit of voltage
Down
- 1. has no limit
- 2. internal heat of earth
- 4. relates to light and energy
- 6. geological period
- 7. relates to heat
- 10. A measurement of current
- 12. Moral
- 14. particles involved in electricity
- 15. He discovered photovoltaic