What is energy? Types of energy Energy = the ability to do work
Energy cannot be created or destroyed; it just transforms from one
form to another 1.Heat or thermal 2.Sound 3.Light 4.Chemical 5.
Mechanical/kinetic 6. Electrical 7. Nuclear
Slide 3
Station activity: Energy transformation Visit 5 stations Look
at the visual hint or object at each station Note the type of
energy transformation that has taken place Fill out the accompanied
table as you rotate through the station (see next slide)
Slide 4
Station #Energy transformation that I think happening Correct
answer (to be taken up as a class) 1.Windmill mechanical into
electrical energy 2. Battery- powered fan chemical into mechanical
energy 3. Photosynthesis Light energy into chemical energy 4. Hand
crank generator (Dynamo) mechanical into electrical energy 5. Motor
electrical into mechanical energy Energy transformation station
activity
Slide 5
How is electricity generated?
https://www.youtube.com/watch?v=E8QF8uRCEtE&feature=youtu.be A
GENERATOR is used to make electricity Inside a generator, a magnet
called a ROTOR spins inside coils of copper wire called a STATOR.
Copper is a conductor which allows electrons to move freely from
one copper atom to the next, creating a flow of electrons or
electricity. Fan-like wheels called TURBINES are used to spin the
magnets (i.e. rotor) inside the generator. Rotor: rotates; Stator:
stays put
Slide 6
Slide 7
HOW IS ELECTRICITY GENERATED? Wind, steam, water are commonly
used to supply motion needed to produce electricity All power
plants do the same job. They transform kinetic energy (i.e. motion)
into electrical energy (i.e. a flow of electrons) Different energy
sources but same operating principle
Slide 8
Difference between motors and generators MotorsGenerators What
types of energy are converted by a motor? By a generator?
_______________ _____________energy __________________
________________energy Electrical Mechanical
Slide 9
Renewable and Non-renewable energy used in electricity
generation Renewable energyNon-renewable energy Sources of energy
that can be replaced infinitely Sources of energy that cannot be
replaced once used up Examples of renewable energy Wind, solar,
hydro, biomas Examples of non- renewable energy Fossil fuels
(natural gas, coal), nuclear