Across
- 7. A poor conductor is considered an ...........
- 9. A north pole of a magnet will .......... a south pole
- 10. Points to the north pole of a magnetic field
- 12. Resistor that depends on heat
- 17. A sub0atomic particle found in the nucleus of an atom
- 18. Planet closest to the sun
- 19. The unit of potential difference
Down
- 1. Measured by an ammeter
- 2. When resistors are connected in series, the current ...........
- 3. A safety device used to prevent a surge of current
- 4. Collection of billions of stars
- 5. Positively charged sub-atomic particle
- 6. The furthest planet from the sun
- 8. The absence of matter in empty space
- 11. A charged particle
- 13. Same number of protons, with different number of neutrons
- 14. The galaxy Earth belongs to
- 15. A magnetic material
- 16. Most abundant element in the sun
- 17. Contains almost all the mass of an atom