Transcript Energy 2

ENERGY
Energy in all Sciences
 Energy is described differently in different
science subjects.
 It has no perfect definition.
Chemistry
 In chemistry, it is described more on terms of
chemical reactions.
Biology
 In biology, it is described as the amount of
energy that can be transferred to organisms.
Geology
 In geology, it is described as the energy
transformations on earth like volcanoes and
earthquakes.
Meterology
 With meterology, it is described as the
strength of the storm.
Astronomy
 In astronomy, it is described as the strength
of the sun and even black holes.
Physics
 In Physics, energy is the ability to do work.
Energy
 In all sciences though, energy is always a
scalar (measurable) physical quantity.
Conservation of Energy
 Energy cannot be created nor destroyed. This
is called the Conservation of Energy.
 To conserve means not to waste, not to throw
away. (Energy is never thrown away).
 Energy always changes (passes) from one
form to another.
Forms of Energy
 Kinetic Energy
 Potential Energy
 Gravitational Potential Energy
 Thermal Energy
 Electrical Energy
 Chemical Energy
 Nuclear Energy
Kinetic Energy
 Kinetic Energy is energy of motion.
 When you are moving you have more kinetic
energy.
Potential Energy
 Potential energy is energy at rest.
 When you are not moving, you have more
potential energy.
Gravitational Potential
Energy
 Gravitational potential energy is a type of
potential energy that is caused by how far
from the ground the object is.
 The higher the object is held from the
ground, the more gravitational potential
energy the object has.
Thermal Energy
 Thermal energy is energy of heat.
 You feel thermal energy from the sun, from
fires, and from the heater or radiator.
Electrical Energy
 Electrical energy is energy that can be passed
to machines.
 Electricity is electrical energy and is
composed (made of) electrons.
 Electrical energy is usually measured in watts
and kilowatts.
Chemical Energy
 Chemical energy is energy stored in food.
 When chemical energy is passed, most of the
energy is lost.
Nuclear Energy
 Nuclear energy is energy that comes from
radioactive material.
 This energy comes from Nuclear Power
plants in fission reactions where they split the
atoms apart.
Lightning
 Lightning is the electric breakdown of air by
strong electric fields, or a plasma.
 Lightning causes an energy transfer from the
electric field to heat
 Lightning causes mechanical energy (the
random motion of air molecules caused by
the heat), and also light.
Einstein
 Einstein’s famous equation
 E = MC2
Fission
 When atoms are split apart.
 Fission happens in Nuclear power plants
 Always think of a Dr. Pepper loosing its
fizz……the gas comes apart…
Fusion
 When atoms are fused together (put
together)
 Fusion happens in the sun.