Temperature Flashcards
What does the law of thermodynamics tell us?
Heat is gained or lost
What is the only point at which molecular movement exists known as?
Absolute zero
What is the purpose of the refrigeration cycle?
Absorb heat
What are the two most common types of temperature measurements?
Farienhiet and celcius
What is the method of heat exchange that occurs through a liquid or gas?
Convection
What does the refrigeration cycle have for pressure systems for the refrigeration cycle?
Two pressure sides. High and low side
What is happening to heat in the evaporator side of the refrigeration cycle?
It is being absorbed
What side of the cycle is the condenser in the refrigeration cycle?
High pressure
What happens to heat in the high pressure side of the system?
It is dissipated
What kind of strip will deflect or move a coil to express a temperature measurement?
Bimetallic
What can be made of platinum and is very accurate?
An RTD
What has an NTC which means it’s resistance will as the ambient temperature decreases?
A thermosister
What type of sensor is an RTD?
A thermo resistive
What does a thermo resistor require to generate a miliamp signal?
A power source
Does the thermosistor need a power source to change resistance?
No
In an RTD what happens when it’s resistance goes up?
Ambient temperature goes up
What can use a thermosistor be used to monitor in a circuit?
Current
What temperature sensor usually has a NTC?
Thermosistor
What type of temperature sensor has a PTC?
An RTD
What will two dissimilar metals twisted together and dipped in water produce?
A small amount of voltage
What is the method of heat exchange that occurs through a liquid or gas?
Convection
What is the method of heat exchange that can only occur in a vacuum?
Radiation
What is the method of heat exchange that takes place through a solid?
Conduction
What type of temp sensor is a thermo couple?
Thermo electric type sensor
