Energy

Question 1

Name all 8 energies

Answer 1

Strain, nuclear, sound, kinetic, elastic potential, thermal, chemical, gravitational potential, light

Question 2

What is energy measured in?

Answer 2

Joules (J)

Question 3

Efficiency =

Answer 3

useful energy ÷ total energy

Question 4

What is thermal conduction?

Answer 4

When vibrations are passed on through particles in a solid

Question 5

Kinetic energy =

Answer 5

0.5 x mass x velocity(2)

Question 6

GPE =

Answer 6

height x mass x gravity (10 on earth)

Question 7

Hydroelectric power pros and cons

Answer 7

Lots of power, starts quickly, can run 24/7, minimal cost

causes floods

Question 8

Wind turbines, pros and cons

Answer 8

no pollution, minimal running costs

‘ugly’, doesn’t produce much electricity, only works in places with high wind

Question 9

Tidal power pros and cons

Answer 9

reliable, minimal running cost

Causes floodsTidal power pros and cons

Question 10

Biofuels, pros and cons

Answer 10

gives off co(2)

broken down by enzymes

carbon neutral, releases the same amount of co(2) it took in

Question 11

Define effeciency

Answer 11

How much useful energy is produced

Question 12

Pros and cons of non renewable energy

Answer 12

Reliable, powerful, low running costs

will run out, produce co2 and sulfur dioxide (acid rain)

Question 13

Work done =

Answer 13

force x distance moved