Energy Test Flashcards
Conduction
Heat that is transferred through a solid by the collision of atoms
Convection
A natural stirring of a fluid where warm fluid rises and cold fluid sinks, producing a circular current
Radiation
The transfer of thermal energy by electromagnetic waves or fast-moving particles
What are the 3 methods of thermal energy transfer
Conduction
Convection
Radiation
Law of Conservation of Energy
- Energy can never be created nor destroyed
2. It can only change from one form to another
What is negative work?
When the force is opposite in direction to the displacement
ex. a car slowing down
What is zero work?
For work to be done:
- A force must act on the object
- The object must change position
- There must be a component of the force parallel to the direction of the motion
any situation that does not meet these conditions would result in zero work being done
ex. when you push again the wall, the wall does not move so no work is done on the wall.
What are the 10 different forms of energy?
Radiant, kinetic, potential, gravitational potential, elastic potential, chemical potential, nuclear potential, electrical potential, thermal, and sound energy
Radiant Energy
the energy of electromagnetic waves
Kinetic Energy
the energy possessed by an object due to its motion
Potential Energy
energy stored in matter due to its position or the arrangement of its parts
Gravitational Potential Energy
the potential energy associated with the gravitational field
Elastic Potential Energy
the potential energy stored in an object when it is temporarily forced out of shape
Chemical Potential Energy
the potential energy stored in chemical bonds
Nuclear Potential Energy
the potential energy stored in the nucleus of an atom
Electrical Potential Energy
the potential energy associated with electric charges
Thermal Energy
the energy associated with the movement and interactions of the particles in an object (the total kinetic and potential energy of an object’s particles)
Sound Energy
the energy stored in sound waves
Thermal Energy
the total kinetic and potential energy of the particles within an object
Heat
the energy transferred from one object to another
Temperature
the measure of the average kinetic energy
Describe the information given on the Energuide label
- An appliance’s average annual energy consumption in kilowatt hours
- The annual energy consumption range for similar models
- The energy efficiency of the appliance relative to similar models
What type of unit is a kilowatt-hour?
it is a unit of energy
Latent heat
the thermal energy needed for a phase change
Latent heat of fusion
the quantity of thermal energy transferred in a phase change from solid to liquid or the reverse
UNITS: kJ
Latent heat of vaporization
the quantity of thermal energy transferred in a phase change from liquid to gas or the reverse
UNITS: kJ
Specific Latent Heat of Vaporization
the quantity of thermal energy needed to change 1kg of a substance from liquid to gas or the reverse
UNIT: kJ/kg
Specific Latent Heat of Fusion
the quantity of thermal energy needed to change 1kg of a substance from solid to liquid or the reverse.
UNIT: kJ/kg
Temperature, Energy, and Changes of State:
Section I
Substance is a solid that is increasing in temperature
Temperature, Energy, and Changes of State:
Section II
Melting/Freezing/Fusion point – the substance is changing phase from a solid to liquid. The temperature does not change
Temperature, Energy, and Changes of State:
Section III
Substance is a liquid that is increasing in temperature
Temperature, Energy, and Changes of State:
Section IV
Vaporization/Condensation point – the substance is changing phase from a liquid to a gas. The temperature does not change
Temperature, Energy, and Changes of State:
Section V
Substance is a gas that is increasing in temperature
