sciencee

Question 1

central heating system

Answer 1

method of transferring thermal energy from a single, central source through a network of pipes, ducts and vents

Question 2

conduction

Answer 2

transfer of heat through a solid material. ex: heat transferred through warmer sections of walls to cooler sections

Question 3

convection

Answer 3

transfer of heat by moving air. ex: warm air rises through roof

Question 4

radiation

Answer 4

flow of energy in the form of invisible waves

Question 5

chemical energy

Answer 5

sksksk

Question 6

geothermal energy

Answer 6

thermal energy deep in earth

Question 7

insulation

Answer 7

the preventing of heat moving in

Question 8

local heating system

Answer 8

method of providing thermal energy for one small area only

Question 9

refrigerant

Answer 9

liquid that evaporates at a low temp, used in a refrigerator

Question 10

R- value

Answer 10

number that indicates the ability of an insulating material to stop or limit transfer of heat energy

Question 11

solar array

Answer 11

solar cells in panels that are connected, and then positioned to capture and store the suns energy in batteries

Question 12

thermal conductivity

Answer 12

ability of a material to transfer heat by conduction

Question 13

thermostat

Answer 13

device to control temperature; it automatically switches a heating or cooling system on or off

Question 14

what are the 4 natural sources of thermal energy

Answer 14

the sun, geothermal energy, fire, decay

Question 15

describe active solar heating and passive solar heating

Answer 15

passive- heated directly by suns waves

active- heating something mechanically with energy

Question 16

local and central heating systems

Answer 16

central - method of transferring thermal energy from a single, central source through a network of pipes, ducts and vents
local- method of providing thermal energy for one small area only

Question 17

describe the most to least heat loss in a house

Answer 17

most through walls, through roof, then through floor and gaps, and then windows

Question 18

describe a thermostat and how it works

Answer 18

a mercury switch sits on a bimetallic strip. when the strip starts heating up, it thermally expands until it gets so hot that it causes the mercury to slide off of the wires to the furnace causing the furnace to turn off. the bimetallic strip cools off and it thermally contracts until the mercury slides back onto the wires turning the furnace on.

Question 19

passive solar heating

Answer 19

when heating is done directly by sun

Question 20

describe the parts of a refrigerator

Answer 20

the refrigerant in the storage tank is pumped to the freezer unit. it passes through the freezer unit and the liquid evaporates. it cools as it evaporates so heat transfers warmer air inside the refrigerant to the cooler part. the refrigerator space becomes cooler. now a vapor, it flows through the compressor to the condenser coils. heat transfers out, cools down and becomes a liquid.