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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