1. Electricity, Magnetism, and Motion Chapter 3 Section 2 Pages 85 - 89

2. Objective: Explain how electrical energy is converted into mechanical energy and vice versa. Energy: Ability to move an object some distance. Electrical Energy: Energy associated with electrical currents. Mechanical Energy: Energy an object has due to its movement or position. When a wire with a current is placed in a magnetic field, electrical energy is transformed into mechanical energy.

3. Galvanometer: Used to measure small currents. It is a device that uses the rotation of a loop of wire in a magnetic field. The electric current turns the pointer Electric Motor: A device that uses an electric current to turn an axle. *An electric motor converts electrical energy into Mechanical energy. Electricity produces motion! How can you make a loop of wire continue to spin? Current is reversed just as the loop gets to the vertical position. This reverses the direction of the movement of both sides of the loop. The current reverses after each half turn so the loop spins continuously in one direction.

4. Parts of a motor: Commutator: A device that reverses the flow of current through the electric motor. Brushes: Contact points where each half of the commutator gets its electric current. Armature: An arrangement of wires and iron core.