Physics 1005 Lecture Summary 4/25

Flashcards for Physics 1005 Lecture Summary 4/25

Thermal Contact

When objects are in thermal contact, heat naturally flows from a hot object to a cold object, or from a warmer region to a colder region.

Refrigeration Cycle

Requires energy to force heat to flow from a cold object to a hot object.

Evaporator Coil

A component in the refrigeration cycle where low-pressure cold liquid extracts heat from the environment as it evaporates.

Compressor

A component in the refrigeration cycle that pressurizes gas, making it hot.

Condenser Coil

A component in the refrigeration cycle where heat is released to the outside as the refrigerant gas condenses back to a liquid.

Expansion Valve

A component in the refrigeration cycle that limits flow to bring the system back to low pressure and low temperature.

Electric Charge

A fundamental property of particles that can be positive or negative. Unit is Coulombs (C).

Coulomb

The unit of electric charge, abbreviated as C.

Coulomb's Law

The size of the force each object exerts on the other is proportional to the magnitude of the charges (how many coulombs of charge each object has), and it is inversely proportional to the square of the distance that separates the two objects.

Electric Potential

Also known as voltage, it is the 'electric hill' that causes charges to move, measured in volts.

Voltage

Electric potential, the 'electric hill' that causes charges to move, measured in volts.

Volt

The unit of electric potential (voltage).

Electric Current

The movement or flow of electric charge per unit time.

Ampere

The unit of electric current, equivalent to 1 Coulomb per second.

Evaporation

The process where a liquid refrigerant extracts heat from the environment to transform into a gas.

Condensation

The process where refrigerant gas releases heat to the outside to become a liquid.

Repel

The way like-charged objects behave when near each other.

Attract

The way unlike-charged objects behave when near each other.

Battery

A device that supplies the electric potential, or voltage, necessary to get charges moving.

Electron

A particle that has a negative charge