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Flashcards in Part 0 Deck (23)
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1

what is the equation for work done?

force x distance moved

2

what is work done measure in?

joules

3

what do work done and energy transferred have in common?

they are equal

4

describe the energy transfer of wind to electricity

kinetic energy from the wind turns a turbine which turns a generator which produces electricity

5

describe the energy transfer of water to electricity

kinetic energy from water turns a turbine which turns a generator which produces electricity

6

describe the energy transfer of geothermal resources to electricity

thermal energy heats water, water turns into steam, the thermal energy of the steam then turns a turbine which then has kinetic energy, the turbine turns a generator which produces electricity

7

describe the energy transfer of solar heating systems to electricity

thermal energy from the sun heats water which turns into steam that turns a turbine that then has kinetic energy, the turbine turns a generator which produces electricity

8

describe the energy transfer of solar cells to electricity

light energy from the sun is transferred into electrical energy

9

describe the energy transfer of fossil fuels to electricity

chemical energy is burnt to form heat energy as it causes water to evaporate, the kinetic energy of the steam is used to make a turbine spin which is connected to a generator transferring it to electricity

10

describe the energy transfer of nuclear power to electricity

chemical energy is burnt to heat water which turns to kinetic energy that turns a turbine connected to a generator which produces electricity

11

how is energy transferred by conduction?

when heat is applied to a solid the particles begin to vibrate. These particles vibrate faster and faster throughout the entire material causing it to heat up

12

how is heat transferred by convection?

in liquids and gases when heat is applied the particles gain energy (thermal-kinetic) and move faster. They move further apart and become less dense causing heat particles to rise. Eventually they cool again and sink until they become closer and more dense again; this process continues creating a convection current

13

how is energy transferred by radiation?

this is when heat is transferred through infrared waves. The hotter the object, the more infrared radiation it emits. This does not need matter to occur. It is a type of EM radiation and can happen even in a vacuum, unlike convection and conduction

14

what are bad conductors of heat called?

insulators

15

how do insulators reduce energy transfer from buildings?

heat loss through windows is reduced using double glazing with air or a vacuum between the two panes of glass as air is a poor conductor of heat and a vacuum can only transfer heat by radiation. Heat loss through walls and roofs is reduced using loft/wall insulation as it stops heat loss by conduction and convection preventing air from circulating inside

16

how do insulators reduce energy transfer in the human body?

an insulator is something that is bad at conducting. If something with heat energy is surrounded by an insulator, it won't lose heat by conduction. So human wear layers of clothes that act as several insulators to prevent heat loss by conduction

17

what is the formula for density?

density= mass/volume (p=m/v)

18

how can you determine the density of a regular object?

1. measure the mass of the object using a balance
2. measure the length, width and height of the object
3. calculate the density using density= mass/volume

19

how can you determine the density of an irregular object?

1. measure the mass of the object using a balance
2. place the object in a measuring cylinder of a known volume
3. measure the displacement of water (how much it has increased)
4. calculate the density using density= mass/volume

20

what is the equation for pressure?

pressure= force/area

21

what is the brownian motion?

brownian motion states that particles move in a random unpredicted motion

22

what is particle theory?

particle theory states that gases consist of particles that are constantly moving in a random direction

23

how do particle theory and brownian motion support each other?

the two theories support each other as both theories state that particles move in a random motion/direction