Topics 1-2
Synonyms for heat and how hot or cold something is:
(two different words)
Thermal energy and temperature
The average speed of particles is always indicated by their__________
temperature
We expect sunbstances to ________ when heated and ___________ when cooled.
expand; contract
The transfer of energy without the movement of matter.
Electical energy can be produced at________ stations that burn fossil fules.
generating
Estimating temperature with your ( ) and ( ) can be poorly accurate and dangerous.
sight and touch
State the four points of the particle model of matter:
-All matter is made of particles to small to be seen
-These particles are alyways in motion
-These particles have space between them
-The motion of particles is proportional to temperature ( i.e, -increase with higher temp.)
State three examples of evaporative cooling.
Example:
Joggers sweating and coooling off, a person feels cold after coming out of the ocean, home owners spray their house with water during the summer to cool it down.
State the three characteristics of EMR.
-They behave like waves
-They can be absorbed/reflected by object
-They travel across empty space at the constant speed of 300000km/h
What is a mechanical force?
A force that pushes or pulles something.
This type of thermometer uses wires of two different metals twisted together that generate electrical current when heated,
A thermocouple
Energy is defined as________
An objects ability to do work.
State the differencr between heat capacity and specific heat capacity.
Heat capacity is the amount of thermal energy needed to heat something by 1 degree Celsius, while specific heat capacity is the amount of thermal energy needed to heat 1 gram ofsomething by 1 degree Celsius.
In thermal conduction, poor conductors are called_______
Heat insulators
Define geothermal energy.
Energy that comes fron the center of the Earth.
Each type of thermometer contains a ( ), ( ) and ( ).
sensor , signal and responder
State the Law Of Conservation Of Energy.
Energy can not be created or destroyed; It only changes form.
Why does liquid evaporate?
Liquid evapourates because particles closer to the surface move faster, and some "escape" into the air.
Define fluids and state the way in which they transfer energy.
A fluid is a material that flows, and it conducts heat by a convection current.
Define HDR.
Hot dry rock; a system when engineers pump water into cracks in the ground and wait for it to shoot back up as steam due to geothermal energy. The stam is then used to spin turbines and generate electricity.
Objects high in temperature give off heat. What colour of light gives of the highest temperature?
Violet
Heating something increases the ____________ of its particles; however the _________stays the same.
total energy; average energy
During a phase change, the average energy of the particles stays the same, thus the temperature stays constant.The energy change, undetected by thermometers, is called ______ or _________ heat.
Hidden or latent
State the five features of an energy transfer system.
- Energy source
- Waste heat
- Direction of energy transfer
- Energy Transformations
- Control
Passive solar heating uses this to do this.
Matherials built into the structure to store and realese heat, heating the building.