forms of energy
what is energy?
capacity to do WORK
T/F
Heat moves from cooler to hotter objects?
FALSE
hotter to cold
What is useful energy?
energy used to perform work
Conductor
what colour is reflected by a green plant?
green
What is potential energy?
stored energy
T/F
Conduction is transfer through direct contact
True
what is waste energy?
energy not needed for work
A material that does not allow electricity or heat to flow through
Insulator
what colour is absorbed by a green plant
any colour other than green
what is kinetic energy
energy in a moving object
Name 3 types of heat transfer
Conduction
Convection
Radiation
Why is energy efficiency important?
saves natural resources
saves money
reduces pollution
T/F
Metals are bad conductors of energy
False
how does sound travel
travels through waves
what energy is stored at a height
gravitational potential energy (GPE)
convection is the transfer of heat through _______?
Air or liquids
T/F in a sankey diagram the thinner the arrow, the more energy it represents
False
thinner arrow = less energy
thicker arrow = more energy
provide an example of insulator material
plastic, wood, glass
name an example of invisible light
x-ray, UV rays, radiowaves, microwaves
What energy flows from a hotter particle to a cooler particle?
Heat energy
Radiation is the transfer of heat through ______?
Light/waves
calculate energy efficiency
useful energy / total energy x 100 = %
useful energy: 50
total energy: 100
50%
50 / 100 X 100 = 50%
what type of heat does a blanket trap when you sleep ?
body heat
what form of energy is light transformed into when absorbed
Heat