1. Section 3-2 Electricity, Magnetism and Motion

2.  N.3.2.1. Explain how electrical energy can be transformed into mechanical energy.  N.3.2.2. Describe how a Galvanometer works.  N.3.2.3. Describe what an electric motor does. Objectives

3.  Do you remember the Conservation of Matter Law? What does it say?  Matter is not created or destroyed, only changed.  So what do you think the Conservation of Energy might say?  Energy is not created or destroyed, only changed. Conservation Of Energy

4. Electrical Energy And Motion Electrical To Motion  When a wire carrying a current is placed in a magnetic field, the electrical energy is converted to mechanical energy. Motion To Electrical  When a wire is moved through a magnetic field, and electric current is induced and mechanical energy is converted to electrical energy.

5. Creating Current  When a wire moves through a magnetic field it induces a current in the wire. This is call Electrical Induction. Mechanical energy is changed into electrical energy.

6. Space Station Tether Experiment  The Shuttle Columbia pulled a conducting tether through Earth’s magnetic field to create electricity.

7. Creating Current  A typical dam uses gravity to pull water through a turbine which turns a generator and produces electricity.

8. Creating Motion  Electricity in a motor can be converted into rotational mechanical motion. This device is called a motor.

9. It Works In Both Directions Generator  What does a generator convert?  A generator converts mechanical energy to electrical energy. Motor  What does a motor convert?  A motor convert electrical energy to mechanical energy.

10. Galvanometer

11. Electric Motors  An electric motor transforms electrical energy into mechanical energy. Objective N.3.2.3.

12. Commutator

13. Look Closely

14. Keep Looking