physics topic 1- energy

Question 1

what are non-renewable energy resources?

Answer 1

can not be reused but are reliable

Question 2

what are some examples of renewable energy resources?

Answer 2

-wind
-solar
-hydro-electric
-geothermal
-biofuels

Question 3

what are some advantages of solar cells?

Answer 3

-can charge batteries
-no pollution
-initial cost is high but after energy is free

Question 4

what are solar cells?

Answer 4

-renewable resources
-generate electricity directly from sunlight

Question 5

what is a disadvantage of solar cells?

Answer 5

can not increase power output when extra demand

Question 6

what are advantages of wind power?

Answer 6

-no pollution
-no permanent damage

Question 7

what are some disadvantages of wind power?

Answer 7

-very noisy
-when wind stops, turbines stop
-impossible to increase supply when extra demand

Question 8

where does geothermal power come from?

Answer 8

volcanic areas

Question 9

what are some advantages of geothermal power?

Answer 9

-reliable
-does not harm environment

Question 10

what are some disadvantages of geothermal power?

Answer 10

-not many suitable locations
-high cost compared to amount of energy produced

Question 11

what is hydro-electric power?

Answer 11

flooding of a valley by building a damn and water is allowed out by turbines

Question 12

what are some advantages of hydro-electric power?

Answer 12

-no pollution
-no fuel costs and minimal running costs
-reliable except for times of drought
-immediate response to an increased demand for electricity

Question 13

what is kinetic energy?

Answer 13

energy in moving objects

Question 14

what is thermal object?

Answer 14

energy in objects with a temperature

Question 15

what is gravitational potential energy?

Answer 15

in objects above the ground

Question 16

what is elastic potential energy?

Answer 16

in squashed or stretched objects

Question 17

what is chemical energy?

Answer 17

in fuels and food

Question 18

what is magnetic energy?

Answer 18

in magnetised objects

Question 19

what is electrostatic energy?

Answer 19

in objects with an electrical charge

Question 20

what is nuclear energy?

Answer 20

in the nuclei of atoms

Question 21

what is energy?

Answer 21

capacity to do work

Question 22

what is the mass number?

Answer 22

number of protons + neutrons

Question 23

what is the atomic number?

Answer 23

number of protons

Question 24

what did Rutherford’s experiment show?

Answer 24

most of the atom was empty space

Question 25

what is a renewable energy resource?

Answer 25

one that can be replenished