Vocabulary
stored energy
potential energy
A plug-in radio converts ____________________ energy into the ____________________ energy of a vibrating speaker.
electrical
sound
A plug supplies a toaster with ____________________ energy, which is converted into ____________________ energy, which can be seen, and also ____________________ energy, which can be felt.
electrical
radiant
thermal
What are the three ways to transfer heat?
Radiation
Convection
Conduction
Change of state from a liquid to a gas
Vaporization
energy of motion
the sum of potential and kinetic energy
mechanical energy
A washing machine converts the ____________________ energy supplied by Springfield Electric into the ____________________ energy of the oscillating agitator.
electrical
mechanical
A match converts the ____________________ energy of the sulfur into visible ____________________ energy and also ____________________ energy.
chemical
radiant
thermal
Convection occurs in _______ and______ only
liquids and air
Change of state when dry ice heats up (in which it skips the liquid phase)
Sublimation
energy formed in bonds
chemical energy
A car’s generator converts the ____________________ energy of spinning, into the ____________________ energy, which powers the radio, etc.
mechanical
electrical
A gasoline engine converts the ____________________ energy of octane into the ____________________ energy of the turning wheels, and the ____________________ energy of a hot radiator.
chemical
mechanical
thermal
Radiation transfers heat through _______________
electromagnetic waves
The melting and freezing point of water is the same temperature of
0 degrees Celsius
state the Law of Conservation of Energy
Energy cannot be created or destroyed, but it can change from one form of energy to another.
The ____________________ energy stored in your body is used to provide the ____________________ energy needed to walk behind the mower.
chemical
mechanical
The action of rubbing one’s hands together demonstrates the conversion of ____________________ energy into ____________________ energy.
mechanical
thermal
Conduction is heat transfer through touch. Give an example
A stove heats up a pan which then heats up water
When object lose thermal energy they ______ in size (except water which ______ in size when cold)
shrink
expand
Define energy transformation
a change from one form of energy to another
Explain the transformation that takes place when you turn on a flashlight. From the battery to the light. 5 steps
Chemical (of the battery) to electrical (flow of electrons) to mechanical to radiant (of the light) to thermal (the heat produced by the light)
The following steps describe the process of generating electricity by burning coal in a power plant:
1. The coal fire converts liquid water to steam.
2. The steam rotates fanlike blades of a mechanical turbine.
3. The shaft of the turbine spins an
electric generator.
4. The electric power is delivered to the consumer over long-distance power lines.
Which energy transformation occurs during this process?
chemical (stored in coal) to thermal (when coal is burned and creates steam) to mechanical (turns the turbine) to electrical (spinning turbine generates electricity)
In any energy transformation, some energy is always lost in the environment as _________.
thermal energy
4. When energy is transferred in a system, the total amount of energy before the transfer is _____________ after the transformation is complete, just in different forms.
is it the same or different?
the same