Across

1. 3adjective Related to the Sun. (5)
2. 5adjective Using little energy to do a lot of work. (9)
3. 8noun You press it to turn a light on or off. (6)
4. 10noun A thin metal thread that carries electricity. (4)
5. 11noun The flow of electric charge. (7)
6. 12noun A machine with blades that spins to make electricity. (7)
7. 13adjective Related to the center of atoms; a type of power plant. (7)
8. 14verb To let heat or electricity pass through. (7)
9. 15noun Something we burn to get energy, like gas. (4)

Down

1. 1noun The unit used to measure electric voltage. (4)
2. 2noun The unit used to measure power. (4)
3. 4verb To fill a battery with energy again. (8)
4. 6verb To cover something so heat or electricity can't pass. (8)
5. 7noun It stores energy for your phone. (7)
6. 9verb To produce energy. (8)
7. 11noun A closed path that electricity flows through. (7)