Energy Stores
This store is due to an object’s movement.
Kinetic
Energy can be transferred when i pick up a book
gravitational potential energy increases
Metals react with oxygen to form this.
metal oxide
Metal is taken from rock called this.
Ore
Unit used on electricity bills.
kWh
Stored energy in food is this type.
Chemical
energy transfer through waves
radiation
metals react with acid to form this
metal salt + hydrogen
Heating with carbon is used for these metals.
less reactive metals
Cost depends on energy used and this.
price per kWh
Energy stored due to height above the ground.
Gravitational Potential energy
an electric bike transfers energy from to the kinetic energy store
chemical
Magnesium + oxygen → product?
magnesium oxide
Aluminium is extracted by this method.
electrolysis
Why does leaving devices on increase cost?
more energy is used
What happens to energy stores when energy is transferred?
When a bulb lights, energy is transferred from electrical to what two forms?
light and heat
What does reactivity tell us?
how easily a metal reacts
Why not use carbon for aluminium?
aluminium is too reactive
Suggest one way to reduce energy bills.
use less energy/be more efficient
Describe energy stores when a ball falls.
gravitational potential energy to kinetic energy
Explain energy transfer in a moving car.
chemical to kinetic + heat
Predict which reacts faster: zinc or copper.
zinc
Why is electrolysis expensive?
it uses lots of energy
how much does an average fridge cost per day?
£3.15