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# How much energy is one Joule? Not much! - PowerPoint PPT Presentation

What is energy?. Energy is the ability to do work The unit of energy is the Joule, named after James Prescott Joule This is also the unit of work, since energy and work are manifestations of the same thing. http://dspt.club.fr/PortraitJoule.jpg. How much energy is one Joule?

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Presentation Transcript

• Energy is the ability to do work

• The unit of energy is the Joule, named after James Prescott Joule

• This is also the unit of work, since energy and work are manifestations of the same thing

http://dspt.club.fr/PortraitJoule.jpg

• How much energy is one Joule?

• Not much!

• One Joule is the amount of energy it takes to lift a small apple to a height of one meter on the earth

• Often we talk about kiloJoules, thousands of Joules

• Mechanical-Kinetic and Potential

• Light

• Electrical

• Nuclear

• Heat

• Chemical

• Type of potential energy

• Solar energy

Potential + Kinetic = Mechanical

Energy of Motion

Energy cannot be created nor destroyed but can converted into another form of energy.

• It may change forms but you cannot lose energy

• A falling apple illustrates the relationship between potential and kinetic energy

• You can convert it to a form that does not do work such as heat lost as friction

Kinetic energy increases as it falls

Potential energy decreases as it falls

Chemical Potential Energy  Electrical Energy  Light Energy

Chemical potential energy  Kinetic energy

Sound energy  electrical energy  sound energy

Chemical potential energy  heat and kinetic energy

Electrical energy  heat and light energy

Electrical energy  light and sound energy

Chemical potential energy  light and heat energy

• Electrical energy may power a light bulb and be converted to lightenergy.

• The light energy also produces heatenergy.

### Thermal Energy

• Transfer of heat energy from one solid object to another when they are in direct contact.

Convection heat energy through themselves are called

• Process of heat transfer in fluids (liquids and gases) by means of rising and falling currents.

• When a region of liquid or gas absorbs heat energy, its molecules move faster, and the distance between them increases.

• The region of fluid expands as a result and becomes less dense than its surroundings.

Radiation heat energy through themselves are called

• Transfer of heat energy in the form of electromagnetic waves

• The same kinds of energy waves transfer heat and light energy from the Sun as it radiates energy to Earth.

• Infrared heat energy through themselves are called electromagnetic waves are sensed by nerves in the skin as heat.

• All warm bodies radiate heat energy in the form of infrared electromagnetic waves.

more potential energy?

OR

A bird in your hand, 1 m above theground

The same bird on the limb of a tree, 5 m above the ground

more potential energy?

OR

A tennis ball, sitting on a shelf 2 m above the ground

A softball, sitting on a shelf 2 m above the ground

OR

A bowling ball, rolling at a speed of 2 m/s

A beach ball, rolling at a speed of 2 m/s

OR

A golf ball, flying through the air at a speed of 10 m/s

A golf ball, flying through the air at a speed of 15 m/s