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Dragons9-13.3
pp 435-444
| Question | Answer |
|---|---|
| What are processes that involve energy transfer by work called? | mechanical processes |
| What things does a central heating system burn? | coal, fuel oil and natural gas |
| A solar collector uses ____ to gather energy radiated from the sun. | panels |
| Solar energy is used to ____ water. | heat |
| Usable energy ____ in all energy transfers. | decreases |
| When energy can be easily transformed to accomplish a task, the energy is in _____ form. | usable |
| Good insulation can reduce but not eliminate the unwanted transfer of ___ to and from the building's ______. | surroundings |
| Amount of ____ energy will always decrease when energy is transferred or transformed. | usable |
| Useable energy decreases in all energy transfers. Some energy is lost because it transfers to things like | hot water tanks and electrical wiring |
| Insulation is placed in walls and attics to ____ unwanted transfer of heat. | reduce |
| _____ rating system measures effectiveness of insulation materials. | R-value |
| In all cooling systems, energy is transferred as ___ from one substance to another; leaving the first substance with less energy and a lower temperature. | heat |
| Refrigerators, which is a cooling system, uses ____ to transfer energy. | evaporation |
| Refrigerant evaporates into a ___ and condenses back into a liquid. | gas |
| In liquids that are good refrigerants, ___ occurs at a much lower rate than air inside the refrigerator. | evaporation |
| Air conditioning systems in homes and buildings use the same cooling process as ____. | refrigerators |
| With an air conditioning system, a ___ blows cool air from the evaporation coils to rooms in a house. | fan |
| With an air conditioning system, ___ coils in a room allow cool air to travel. | convection |
| A _____ pump is a refrigeration unit in which the cooling cycle is reversed. | heat |
| With a heat pump, in the winter and summer, refrigerant is pumped in ___ directions. | opposite |
| When energy is transferred between two objects, what happens to the amount of usable energy? | it decreases |
| What two energy sources are often used for heating systems? | fuel-burning furnaces, sunlight |
| What do refrigerators and air conditioning use for cooling? | evaporation of a refrigerant |
Created by:
JAnderson,PCHS
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