Energy - Paper 1 Flashcards Preview

AQA Physics Paper 1 11-A > Energy - Paper 1 > Flashcards

Flashcards in Energy - Paper 1 Deck (42)
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1

What is a system?

an object or group of objects

2

Describe the energy changes when a ball is thrown upwards

Kinetic energy into GPE and thermal

3

Describe the energy changes when an object hits an obstacle

Kinetic into Thermal and sound

4

Describe the energy changes in a torch

Chemical into electrical into thermal and light

5

State the equation and all units for kinetic energy

kinetic energy (J) = 0.5 × mass (kg) × speed Squared (m/s)

6

State the equation and all units for GPE

g.p.e. (J) = mass (kg) × gravitational field strength(N/kg) × height (m)

7

Define specific heat capacity

the amount of energy required to raise the temperature of one kilogram of the substance by one degree Celsius.

8

State the units for specific heat capacity

J/kg °C

9

Define Power

Rate at which energy is transferred into a new form

10

State the equation with all units for Power.

Power (W) = energy (J)/ time (s)

11

Define 1 W

An energy transfer of 1 joule per second

12

State the conservation of energy

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

13

Define thermal conductivity

How well a material can insulate. The higher the thermal conductivity of a material the higher the rate of energy transfer by conduction across the material.

14

How can heat loss from a building be minimised?

Using thicker walls and materials with a lower thermal conductivity

15

Define efficiency

How effective a device is at converting its input energy into a useful output form of energy

16

State the equation for efficiency

efficiency = useful output energy / total input energy

17

State the 3 fossil fuels

Coal, oil and gas

18

Define a renewable energy resource

One that can be replenished and won't run out

19

State the advantages of fossil fuels

Reliable
Short start up time of a few hours
cheap
can be used in many locations
doesn't produce radioactive waste

20

State the disadvantages of fossil fuels

Non renewable
Will run out
Produces carbon dioxide which leads to global warming
Causes acid rain

21

State the advantages of nuclear power

Reliable
A very concentrated source of energy
No carbon dioxide release
Doesn't cause acid rain

22

State the disadvantages of nuclear power

Slow start up time of a few days
Causes Radioactive waste
High decommissioning costs
Non renewable

23

State the advantages of solar power.

Renewable
Wont run out
no fuel cost
no cardon dioxide
Doesn't cause acid rain

24

State the disadvantages of solar power

Unreliable
Expensive to buy
Don't get much energy so need lots of solar cells

25

State the advantages of wind

Renewable
Wont run out
no fuel cost
no cardon dioxide
Doesn't cause acid rain

26

State the disadvantages of wind

Unreliable
Visual pollution
Noise pollution
Don't get much energy so need a large area of wind turbines

27

State the advantages of hydroelectric

Short start up time
Renewable
Wont run out
no fuel cost
no cardon dioxide
Doesn't cause acid rain

28

Disadvantages of hydroelectric

Expensive to buy the dam
Flooding of surrounding areas
Damage to animal habitats

29

Advantages of geothermal

Short start up time
Renewable
Wont run out
Low fuel cost
no cardon dioxide
Doesn't cause acid rain

30

Disadvantages of geothermal

Expensive to drill
Only suitable in certain locations