Energy Transformation - PowerPoint PPT Presentation

1 / 29
About This Presentation

Energy Transformation


Energy Transformation The process of energy changing from one form to another Example This process is happening all the time in the world around us and even in us. – PowerPoint PPT presentation

Number of Views:39
Avg rating:3.0/5.0
Slides: 30
Provided by: peter1314


Transcript and Presenter's Notes

Title: Energy Transformation

Energy Transformation
  • The process of energy changing from one form to

  • This process is happening all the time in the
    world around us and even in us.
  • When we consume food our body utilizes the
    chemical energy in the bonds of the food and
    transforms it into mechanical energy, a new form
    of chemical energy or thermal energy.

physical sciences application.
  • The ability for energy to be transformed
    automates, lights, entertains, and warms our
    world in an astounding multitude of ways.

common activities illustrations
  • 1.An engine, such as the engine in your car,
    converts the chemical energy of gasoline and
    oxygen into the mechanical energy of engine

Another illustration
  • 2. A light bulb changes the electrical potential
    energy into electromagnetic radiation (light and

Even another illustration
  • 3. Windmills harness the energy of the wind and
    convert it into mechanical energy in the movement
    of the turbine blades, which is then converted to
    electrical energy.

Last of many more
  • 4. Solar panels transform light to electricity OR
    to heat (solar-cooker)

Matter and Energy
  • There are 4 fundamental states of matter solid,
    liquid, gas and plasma.  We will concern
    ourselves only with the first three since the
    plasma state does not occur commonly in on
    Earth.  (Although it is the most common state in
    the universe, in stars)

Matter Solid
  • In solids, molecules are tightly packed
    together. The molecules of a solid do move,
    however their movement is very limited.

Matter Liquid
  • As you add energy to ice in the form of heat, you
    increase the amount of movement by each molecule.
  • This movement eventually causes the solid ice to
    turn into liquid water

Energy Transfer
  • Energy can be transferred from one location to
    another, as in the sun's energy travels through
    space to Earth. The two ways that energy can be
    transferred are by doing work and heat transfer.

Doing Work
  • Adding energy to an object by pushing
  • If a force is exerted and the object moves as a
    result, then work is done

Doing Work
  • Energy can be transferred from one object to
    another by doing work. When work is done on an
    object, it results in a change in the object's
    motion (more specifically, Energy is often
    defined as the ability to do work. Work equals
    force multiplied by distance. change in the
    object's kinetic energy). Work Force x distance

Heat Transfer 

More about Heat Transfer
  • Heat is transferred when thermal energy moves
    from warmer to colder.
  • Thermal energy can be transferred in three ways
    by conduction, by convection, and by radiation.

The Transfer Process
  • Conduction
  • Conduction is the transfer of energy from one
    molecule to another
  • Sort of like direct contact in pool.

More about transfer
  • This transfer occurs when molecules hit against
    each other, similar to a game of pool where one
    moving ball strikes another, causing the second
    to move. Conduction takes place in solids,
    liquids, and gases, but works best in materials
    that have simple molecules that are located close
    to each other. For example, metal is a better
    conductor than wood or plastic.

  • Convection is the movement of heat by a liquid
    such as water or a gas such as air.
  • The liquid or gas moves from one location to
    another, carrying heat along with it. This
    movement of a mass of heated water or air is
    called a current.

  • Heat travels from the sun by a process called
    radiation. Radiation is the transfer of heat by
    electromagnetic waves. When infrared rays strike
    a material, the molecules in that material move
    faster. In addition to the sun, light bulbs,
    irons, and toasters radiate heat

Thermal (Heat) Energy
  • Heat is given off whenever energy is being used.
    You can tell if a television has been on by
    feeling if it is warm. When you run up a flight
    of stairs you feel warm because you are burning
    food energy.

D4 Energy Transformation among voltage,
current, and resistance
  • Simple series circuit.
  • Simple Series Circuit Diagram

Series Circuits
  • When you flip a light switch on and off, you are
    closing and opening a circuit.
  • A circuit is the path that electricity follows.
  • For electrons to travel (creating an electric
    current), the circuit must be closed.
  • When you flip the light switch off, you are
    opening the circuit and the lights turn off.
  • When you flip the switch on, the circuit it
    closed and the lights come on.

Series Circuit VOLTAGE
  • Electromotive force, or EMF (sometimes called
    electrical pressure) causes the electrons to move
    in an electrical circuit.It is the force that
    makes electrons move in a certain direction
    within a conductor.
  • But how do we create this electrical pressure
    to generate electron flow? There are many sources
    of EMF. Some of the more common ones are
    batteries and generators, just to name a few.

The Volt
  • Technically (very technically), one volt is
    defined as the electrostatic difference between
    two points when one joule of energy is used to
    move one coulomb of charge from one point to the

  • electrical current will flow as the electron
    moves from the negatively charged area to the
    positively charged area
  • EMF is electromotive force. EMF causes the
    electrons to move in a particular direction.
  • EMF is measured in units called volts.

  • Define resistance and how we measure it.
  • Discuss the similarities between resistance in a
    wire and the resistance in a water hose.
  • OhmsResistance is a term that describes the
    forces that oppose the flow of electron current
    in a conductor
  • Resistance is also good because it gives us a way
    to shield ourselves from the harmful energy of

OHMs Law
  • Calculate the amount of electric current in a
    circuit using Ohm's law.
  • I V/R,
  • I current, V voltage, and R resistance
  • V I x R
  • R V/I

D5 Electricity Energy Transformation
  • Electricity is a term used to describe the energy
    produced (usually to perform work) when electrons
    are caused to directional (not randomly) flow
    from atom to atom. In fact, the day-to-day
    products that we all benefit from, rely on the
    movement of electrons. This movement of electrons
    between atoms is called electrical current.

Electricity Energy Transformation to heat, light,
and motion
  • Transformation to Heat
  • Transformation to Light
  • Transformation to Motion
Write a Comment
User Comments (0)