Download Chapter 17 Changing energy forms Lesson 1: How can energy

Chapter 17
Changing energy forms
Lesson 1: How can energy change
Summary: Energy can change when it is used. Energy is changed from
stored energy to electrical energy when you use batteries. Electrical energy
powers computers, tablets and clothes.
Note's:
*Energy exists in many different forms
*Energy can change from one form to another but it's never lost completely.
*Some animals like the electric catfish use electrical energy to shock their
predators.
*Every change involves energy
*Energy is the ability to cause change or do work
*Kinetic energy is the mechanical energy of a moving object
*Potential energy is mechanical energy due to position
*A geyser can release a lot of stored energy
*Electric energy is stored in batteries
*Firefly converts chemical energy into light energy
*Glow sticks like a firefly also convert chemical energy into light energy
*The food we eat is converted into energy we use to do work
*All energy in the end involves some sort of work
*Electric energy powers phones, computers and tablets
*A tree growing is a example of photosynthesis which involves energy
*Similarly to a geyser a volcano builds up energy
*When you rub your hands together your hands get warmer because the
energy changing is a
result of friction
Lesson 2: How are electricity and magnetism related
Summary:
Note's:
*Turbines convert mechanical energy into electrical energy
*A battery has one side that loses electrons and another that attracts them
*Electric current is the flow of electrical charge in a material
*Electric circuit is a closed path along which current can flow
*If one light bulb in a series circuit is broken the other will also go out
*Adding coils to a electromagnet increases its current
*Oersted accidentally discovered the relationship between moving electric
charge and magnetism
*When electricity flows through a wire a magnetic field forms around the
wire
*People have known about magnetism for more than 1,000 years.
*A generator is a device that changes mechanical energy into electrical
energy
*Electrons flow easily through a conductor