forms of energy Flashcards
can you name the different forms of energy
chemical energy -eg food, coal, oil and gas
kinetic energy - energy of movement
gravitational potential energy - energy from being high up
elastic energy - the energy in a spring or elastic band
electrical energy - electrical current
thermal (heat) energy - eg from a fire, cooker or the sun
light energy
sound energy
magnetic - Energy in magnets and electromagnets
nuclear - stored in atoms
can energy be created
NO - energy is transformed from one form to another
can energy be destroyed
no - energy can not be destroyed BUT energy can be lost to the atmosphere eg the heat energy produced by a TV is lost to the atmosphere
what kind of energy is changed into electrical energy by a generator
the generator uses kinetic(movement) energy to make electrical energy
what sort of energy does a ball have if it is on the top of a wall and then falls to the ground
on top of the wall it has gravitational potential energy which is transformed into kinetic energy as it falls
a TV uses electrical energy - what does it transform it into
electrical energy is transformed into light energy (pictures), sound energy and heat energy
which type of energy is wasted in a TV Light energy (pictures), sound energy or heat energy
Heat energy - we don’t use a TV to get warm
in a car name the forms of useful energy
petrol - chemical energy light energy - so we can see where we are going at night sound energy - so we can listen to music heat energy - to keep us warm kinetic energy - to make the car move
in a car name the forms of wasted energy
heat energy - the moving parts in the engine release heat into the atmosphere
noise energy - the movement in the engine causes noises which are lost to the atmosphere
kinetic energy - when the engine is moving but the car isn’t the energy is lost as sound and heat energy.
energy is measured in Joules. true or false
true - a joule is the amount of energy it takes to lift a 1m weight 1m
what does a SANKEY diagram show
the amount of energy input and how the energy is output
for example a T 100J of energy goes into a TV. 48J is transformed into light energy, 37J is transformed into sound energy and 15J is wasted as heat
100-(48+37) = 15J wasted
what do we mean by ‘conservation of energy’
energy cannot be created or destroyed
what does the term useful energy mean
the energy that is used for the right form eg light bulb producing light energy
what do we mean by the term wasted energy
wasted energy is the energy that is not transferred to the chosen use eg heat energy produced by a light bulb
what happens to wasted energy
it spreads out into the surroundings
