Energy revision

2. sulfur impurities in fossil fuels add to this problem
4. the unit of measurement of energy
6. these materials are generally good insulators
9. coal, crude oil (petroleum) and natural gas are examples
13. the unit of measurement of electrical energy used to pay the electricity bill
15. formed from prehistoric forests
16. this change of state allows heat to leave a hot liquid
17. energy is passed through the vibration of particles in solids
19. heat from the sun can pass through the vacuum of space with this type of heat transfer
21. these materials are generally good thermal conductors
22. showing useful and non-useful energy transferred
24. calculated by dividing the energy transferred usefully by the total energy transferred

1. use energy from the sun directly to heat water
3. formed from marine microorganisms
5. the quantity of energy required to cause a one degree C temperature rise in 1kg of a particular substance
7. the form of energy possessed by moving objects
8. at the end of the race, marathon runners wrap themselves in foil blankets to reduce heat loss by this
10. increasing the carbon dioxide content in the atmosphere can cause this
11. the rate of transfer of energy
12. convert energy from the sun into electricity
14. energy source caused by radioactive rocks underground
18. the unit of measurement of power
20. hot liquids or gases are pushed upwards by cooler fluid as it sinks
23. energy from, e.g, uranium, used to generate electricity