Physics - Chap 12

Question 1

Biomass

Answer 1

Organic material made up of plant and animal waste

Question 2

Efficiency

Answer 2

Ratio of the useful energy that comes out of a device to the total energy that went in

Question 3

EnerGuide

Answer 3

Label that states how much energy an appliance will use in a month or year of average use

Question 4

Energy grid

Answer 4

Web of interconnections between generating stations, substations, and users; also called a distribution grid

Question 5

Energy star

Answer 5

Symbol identifying the most efficient appliances in each class

Question 6

Fossil fuels

Answer 6

Fuel formed from the organic matter of organisms that lived millions of years ago; includes coal, oil, and natural gas

Question 7

Geothermal energy

Answer 7

Energy from water naturally heated by hot rock in earths crust

Question 8

Hydroelectricity

Answer 8

Electricity generated by harnessing the power of falling water

Question 9

Kilowatt-hour (kWh)

Answer 9

Commonly used unit of electrical energy, equal to a consumption of one kilowatt in one hour

Question 10

Non-renewable energy sources

Answer 10

Resource that cannot be replaced once it is used up, such as coal or oil

Question 11

Renewable energy sources

Answer 11

Resource that can be reused or replaced such as sunlight and wind

Question 12

Thermoelectric generating plant

Answer 12

Electricity generating plant that uses a fuel such as coal or biomass to heat water to create high pressure steam

Question 13

Thermonuclear

Answer 13

Electrical energy produced by heat in nuclear power stations

Question 14

Turbine

Answer 14

Machine that uses the flow of a fluid to turn a shaft; used in generators to generate electricity

Question 15

Generator

Answer 15

Device that transforms the energy of motion into an electric current