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6. energy can be created and destroyed
7. biomass/bio fuels are...
- thermal energy of biological matter- electrical energy
- chemical energy- thermal energy in burning
- kinetic energy of biological matter- thermal energy in burning
- chemical energy- potential energy
8. energy efficiency=
- useful output energy/ total input energy
- total input energy/ useful output energy
- total input energy x useful output energy
- calories eaten for dinner/ price of fish and chips
9. which one of these is NOT a form of energy
- electrical
- nuclear
- chemical
- elastic potenial
- kinetic
- thermal
- sound
- friction
- light
- gravitational potential
10. useful and total energy is measured in...
- millimetres
- joules
- kilograms
- ounces
11. hydroelectric power is...
- chemical energy of the raised water- thermal energy
- gravitational energy of the raised water- electrical energy
- kinetic energy of the raised water- electrical energy
- gravitational energy of the raised water- thermal energy
12. tidal power is...
- kinetic energy of the water- thermal energy
- kinetic energy of the water- electrical energy
- chemical energy of the water- gravitational potential energy
- thermal energy of the water-electrical energy
13. payback time=
- saved money x income
- cost x savings per year
- cost / savings per year
- savings per year / cost
14. what causes energy losses
- current, drag, potential
- flying, speed, drinking
- friction, noise, vibrations
- air resistance, friction, sound, current
- pull, drag, chemical
15. wind energy is...
- chemical energy of the wind-electrical energy
- kinetic energy of the wind- electrical energy
- gravitational energy of the wind- thermal energy
- kinetic energy of the wind- thermal energy
16. power=
- time it takes to get to school x number of lessons
- energy transferred/ time taken
- time taken / energy transferred
- energy transferred x time taken
17. solar power is...
- light/thermal energy from the sun- thermal energy of the water/ electrical energy for electricity
- heat energy of the sun- thermal energy of the water/ electrical energy for electricity
- light/thermal energy from the sun- electrical energy
- kinetic energy of the sun- thermal energy
18. what reduces the efficiency of a machine?
- eating a burger
- movement
- energy losses
- walking away from it
19. wave power is...
- chemical energy of the water- kinetic potential energy
- kinetic energy of the water- electrical energy
- chemical energy of the water- thermal energy
- kinetic energy of the water- gravitational potential energy