revision grade 7

Radiation uses

• special waves

• light

• microwave

Main source of energy is

• power

• electricity

• sun

conductors

• allows energy to flow through them

• are the same as insulators

• give us power

when particles move upwards when heated, that is c

• radiation

• convection

• convection current

fossils fuels are:

• tree

  honey

  grass

• coal

  hydropower

  fuels

• coal

  oil

  natural gas

potential energy is ...

• chemical food

• stored energy

• the ability to do work

heat is transferred from_______ objects

• cool to cool

• cool to colder

• hotter to cool

---------------is useful in keeping cold items cold and hot items hot

• conductors

• insulators

• fridge

examples of insulators

• thatch roof

  glass

  ceiling

  Styrofoam

  clothes

• wire

  metal

  copper

• rubber

  wood

sources of energy that can be replaced are called _________