module 4 (energy)

Question 1

what are the nine different types of energy?

Answer 1

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

Question 2

what do energy flow diagrams show?

Answer 2

energy transfer

Question 3

define useful energy

Answer 3

energy transferred to an item that allows it to carry out a task

Question 4

define wasted energy

Answer 4

energy which dissipates (escapes) into the surroundings

Question 5

what is energy measured in?

Answer 5

joules (J)

Question 6

what is the equation for energy supplied

Answer 6

energy supplied= useful energy + wasted energy

Question 7

define the conservation of energy

Answer 7

we cant lose or gain energy (energy can be transferred, stored of dissipated but cannot be created nor destroyed)

Question 8

define non renewable (finite)

Answer 8

limited in number - once its used up it can be restored, the rate at which this can happen takes too long in comparison to its usage

Question 9

define renewable

Answer 9

constantly replenished and not exhausted

Question 10

define fossil fuels

Answer 10

natural finite fuels, formed from the remains of living organisms

Question 11

what are the six main types of renewable energy?

Answer 11

solar, wind, hydroelectric, wave, biofuel, geothermal

Question 12

what is the calculation for energy efficiency?

Answer 12

energy efficiency = useful energy / total energy used x100

Question 13

what is the calculation for power?

Answer 13

power (w) = energy transferred (j) / time taken (s)

Question 14

what unit is power measured in?

Answer 14

watts

Question 15

how do power stations work?

Answer 15

1) fossils fuels are burnt, chemical energy turns into heat
2) heat boils water and turns it into gas (steam)
3) steam rises, turns turbine, heat turns into kinetic
4) generator turns kinetic into electrical
5) step down transformer ensures energy is appropriate for all electrical devices