TOPIC 1 ENERGY Flashcards
what are the nine types of energy?
Electrical energy Light energy Sound energy Kinetic energy Nuclear energy Thermal energy Gravitational potential energy Elastic potential energy Chemical energy j
what is electrical energy (example)
it’s energy from when a current flows
what is light energy (example)
light bulbs, sun energy
what is sound energy (example)
energy from loudspeakers
give an example of kinetic energy
anything that moves
give an example of nuclear energy
energy released from nuclear reactions
give an example of thermal energy
energy that flows from hot objects to colder ones
give an example of GPE
possessed by anything which can fall
give an example of elastic potential energy
possessed by springs , elastic, rubber bands…
give an example of chemical energy
foods, fuels, batteries…
what is energy measure in ?
joules (j)
what are the forms of stored energy
potential and chemical energy - this type of energy is waiting to be turned into other forms
what is the principle of the conservation of energy?
Energy cannot be created or destroyed, only transferred.
+ energy is only useful when it can be transferred from one form to another e.g stored energy
how do you calculate efficiency?
(output energy/ input energy) x100
what makes a device insufficient
all mechanical devices experience friction - energy is lost as heat
what is work done measure in ?
joules (j)
what is the unit of measure for power?
Watts (W)
what is energy measured in?
joules
what is mass measure in ?
kilograms (kg)
what is distance measured in ?
metres (m)
what is force measure in ?
newtons (N)
what is one measure in?
seconds (s)