Energy Flashcards
What is the definition of chemical energy? Examples?
Energy stored in substance that is released on burning
Coal, oil, food
What is the definition of heat energy? Examples?
Energy form that gives feeling of warmth
Fire
What is the definition of electrical energy? Examples?
Energy produced by battery or electrical generator
Batteries
What is the definition of sound energy? Examples?
Energy which comes from vibrations in air
Instrument
What is the definition of light energy? Examples?
Energy responsible for photosynthesis & enables us to see
Radiation from sun
What is the definition of magnetic energy? Examples?
Energy stored around magnet or in magnetic field
Bar magnet
What is the definition of strain energy? Examples?
Energy stored in object when it’s stressed or compressed
Energy stored in stretched catapult or compressed trampoline
What is the definition of kinetic energy? Examples?
Energy of moving object
Train
What is the definition of gravitational potential energy? Examples?
Energy possessed by mass because of height above earth’s surface
Energy stored in mass because of height above earth
What is the principle of conservation of energy?
Energy can be changed from one form to another, but total amount of energy doesn’t change
How do we calculate kinetic energy?
E = 1/2 MV squared
How do we find gravitational potential energy? GPE
GPE = mgh
M=mass
G=gravitational field strength in N/Kg
H=height in m
What is efficiency? What is the equation?
Measure of how much of input of energy to device is converted to useful output energy
Efficiency = useful output energy
Total input energy
