AQA GCSE Real Life Energy Transfers
Transferring energy mechanically
A man lifts a box from the floor onto a shelf above the ground. State the inital energy store, final energy store and the way in which the energy is transferred.
Initial energy store will be chemical energy in the man’s muscles
Final energy store will be gravitational potential energy as the box increased in height
Energy transfer method will be mechanical, because the man exerted a force lifting the box up from the ground.
See below for the energy transfer diagram:
Transfer energy by heating
Inital energy store is the hot cooking pan which has a thermal energy store
Final energy store are the eggs which also have a thermal energy store.
Energy transfer method will be heating because the energy is transferring from the hot pan to the cooler eggs.
Transferring energy electrically
Initial energy store is the chemical energy in the battery of the toy car
Final energy store is the kinetic energy store in the car when it moves forward
The energy is transferred electrically from chemical energy store to the kinetic energy store
Transferring Energy by Radiation
Initial energy store is thermal energy of the Sun
Final energy store is the thermal energy store of trees and sand
Energy is transferred by radiation
Practice Questions
Draw energy transfer diagrams for the following situations (click this link for answers)
1.A woman holding a hot water bottle close to her body in order to stay warm during the winter.
2.Using two hands to stretch an elastic band
3. Cooking sausages under an electric grill
4.Battery operated electric motor that spins.
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