Ch 16 Energy Flashcards
what is energy
the ability to do work
what is the SI UNIT for energy
joule (J)
what does the law of conservation of energy state
the law of conservation of energy states that energy cannot be created or destroyed but can change from one form to another
what does an energy transfer diagram show
the useful energy transfers taking place in a process
what is waste
energy transfers that aren’t useful
what is the arrow diagram called
a sankey diagram
explain the sankey diagram
the thicker arrow has more energy . the arrow that goes down is the waste
what does dissipated mean
when the energy is transferred from around a source and heats the room
how do you measure the efficiency of somthing
useful energy transferred divided by total energy x 100 over 1
what is power
the rate at which energy is transferred from one form to another
what is the SI unit for power
watts (W)
how do you calculate power
energy divided by time
what is an energy rating
it shows how much energy a home uses
name 5 ways to increase a homes energy efficiency
- use fewer appliances
- use efficient appliances
- insulate the house
- insulate the hot water cylinder
5 monitor energy use with energy meters
