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# Work Energy & Power

### Junior Cert

Force exerted on an object that causes it to move Work
The ability to do work Energy
The rate at which work is done Power
Energy that an object has due to its motion Kinetic energy
Stored energy that results from the position or shape of an object Potential energy
The energy of stretched or compressed objects Elastic potential energy
Potential energy that depends on the height of an object Gravitational potential energy
Kinetic or potential energy associated with the motion or position of an object Mechanical energy
The energy of moving electrical charges Electrical energy
A form of potential energy that is stored in chemical bonds between atoms Chemical energy
The potential energy stored in the nucleus of an atom Nuclear energy
A form of energy that travels through space as waves Electromagnetic energy
A measure of the average energy of motion of the particles of a substance Temperature
Thermal energy that is transferred from matter at a higher temperature to matter at a lower temperature Heat
Process of increasing volume Expansion
Process of decreasing volume Contraction
The change from solid to the liquid state of matter Melting
The change from the liquid to the solid state of matter Freezing
The transfer of energy by electromagnetic waves Radiation
The change from the gaseous to the liquid state of matter Condensation
The process that occurs when vaporization takes place only on the surface of a liquid Evaporation
The transfer of heat from one particle of matter to another Conduction
The transfer of heat by the movement of currents within a fluid Convection
The change of state from a liquid to a gas Vaporisation
How are energy, work, and power related? If the transfer of energy is work, then the power is the rate at which energy is transferred.
How is work calculated? Force x Distance
How is power calculated? Energy (J) / time (sec) = watts
What are the two basic kinds of energy? potential and kinetic
What are some forms of energy associated with the particles that make up objects? sound, mechanical, thermal, electrical, chemical, nuclear, and electromagnetic
What is an energy transformation? a change of one form of energy into another
What does the Law of the Conservation of Energy state? energy cannot be created or destroyed but can be changed from one form to another
How is thermal energy related to temperature and heat? Heat is thermal energy moving from a warmer object to a cooler object and temperature is the measure of the kinetic energy measured in the objects
What is thermal expansion? the expansion of matter when it is heated
In what direction does heat move? From an area of higher temperature to an arear of lower temperature
What are three forms of heat transfer? radiation, conduction, convection
What causes matter to change state? when thermal energy is absorbed or released. Heating or cooling
What happens to a substance as its thermal energy increases? it particles spread out and the substance expands
Renewable Sources of Energy Solar, Hydro-Electricity, Wind, Nuclear, Tidal, Geothermal & Biomass
Our Primary Source of Energy The Sun
What Energy Conversions occur when we eat food? Stored Chemical energy changing to heat (thermal) and kinetic energy when we move.
What Energy Conversions occur when petrol is used in a car? Chemical energy is changed to kinetic energy.
What Energy Conversions occur when a Car Battery is used? Chemical energy to electrical energy.
How can you convert electrical energy to magnetic energy? Wrap an insulated wire around a nail and pass an electrical current through it making an electromagnet.
Light Energy is converted into electrical energy using a ? Solar Cell
Unit of Energy Joule (J)
Unit of Power Watt (W)
Unit of Work Joule (J)
Created by: p-furl1

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