Y11 Mock Energy

Question 1

what is a system

Answer 1

an object or group of objects

Question 2

energy sources (8)

Answer 2

kinetic
thermal
chemical
elastic potential
gravitational potential
electrostatic
magnetic
nuclear

Question 3

what is specific heat capacity

Answer 3

the amount of energy needed to raise the temperature of 1kg of a material by 1 degree

Question 4

specific heat capacity practical

Answer 4

1 use mass balance to measure the mass of a copper block
2. wrap the insulation around the block
3. put the heater into the large hole in the block and put the block on a heatproof mat
4. connect power pack and ammeter in series and the voltmeter across the power pack
5. use a pipette to put a drop of water in the small hole
6. put thermometer into the small hole and measure the temperature
7. switch power pack to 12v and turn it on
8. read and record voltmeter and ammeter readings (they shouldn’t change during experiment)
9. turn on stopclock and record temperature every minute for 10 mins
10. record results in a table
11. calculate work done and plot a graph of work done against temperature

Question 5

what is power

Answer 5

the rate at which energy is transferred

Question 6

what is the law of conservation of energy

Answer 6

energy can be transferred usefully, stored, dissipated but cannot be created or destroyed

Question 7

what does insulation do

Answer 7

reduce unwanted energy transfers

Question 8

what makes an appliance efficient

Answer 8

the less energy wasted during the transfer , the more efficient

Question 9

main energy resources available (9)

Answer 9

fossil fuels
nuclear fuels
biofuel
wind
hydroelectricity
geothermal
tides
sun
water waves

Question 10

what is a renewable energy source

Answer 10

one that is being or can be replenished as it is used - unlimited supply

Question 11

what is a non renewable energy source

Answer 11

the energy resource will run out

Question 12

how does the boiler work at a fossil fuel power station

Answer 12

coal burnt and heat used to turn water to steam

Question 13

what happens at the turbine in a fossil fuel power station

Answer 13

steam is used to turn the turbine
kinetic energy of the steam is passed onto the turbine

Question 14

what happens at the generator at a fossil fuel power station

Answer 14

turbine is connected to the generator so the generator spins
the kinetic energy is connected to electrical energy

Question 15

renewable energy source examples (7)

Answer 15

solar
hydroelectric
biofuel
wind
tidal
wave power
geothermal

Question 16

non renewable energy source examples

Answer 16

coal
nuclear
oil
natural gas