8K Energy Transfers Flashcards
The sun’s heat energy that travels across space to warm Earth is called……
……..infra-red (or IR)
Are dark or light colours the best good emitters and absorbers of radiation
Dark
Which of these is not a way of trying to reduce energy bills? A increasing the insulation in your home B using more efficient appliances C using appliances with high power ratings D using solar power to heat water
C using appliances with high power ratings
What does emit mean?
To give out.
What does thermal insulator mean?
A material that does not allow internal (thermal) energy to be transferred through it easily.
Which list of materials shows only insulating materials? A wool, feathers, copper B feathers, wood, carpets C iron, copper, steel D plastic, aluminium foil, wood
B feathers, wood, carpets
What does absorb mean?
‘To soak up’ or ‘to take in’.
What happens to the energy in a cup of iced tea left in a cold kitchen?
It will increase as the iced tea gains energy from the air in the kitchen until they are both at the same temperature.
Temperature is measured in,,,,,,
One of
degrees Celsius (°C).
Fahrenheit (F)
Kelvin (K)
What is a fossil fuel?
A fuel formed from the dead remains of organisms over millions of years (e.g. coal, oil or natural gas).
What units for energy are used on
electricity bills?
kilowatt-hours
What does evaporate mean?
When a liquid turns into a gas.
The efficiency of an appliance is calculated
by…….
…….comparing the useful energy
transferred to the total energy supplied
What happens to the energy in a hot cup of tea left in a cold kitchen?
It leaves the tea until it is a the same temperature as the air in the room
How does sweating work?
Sweating cools us down when the sweat evaporates and takes some heat energy with it.
