Lecture 8

Topic(s)	Electricity Electric currents Magnetism
Reading List	403-445 and 446-472
Objectives	Know what is meant by the terms electrically charged and neutral Be able to compare and contrast insulators and conductors Realize that electrical charge is conserved Be able to explain how a charged object can attract a neutral object Be able to explain what an electroscope is and how it can be used Be able to state Coulomb's law for electrical forces Be able to compare Coulomb's law to Newton's law of universal gravitation Be able to describe the electric field around isolated charges Recognize that a battery is combination of electrical cells, and that the voltage of each individual cell is determined by the nature of the chemical reaction of the chemicals in the cell Know what is meant by a complete circuit Know what is meant by the terms series and parallel Know what is meant by the term electrical resistance Be able to apply Ohm's law Be able to predict the brightness of bulbs in a simple circuit Understand (in general) how the electrical circuits in a house are wired Know why fuses are necessary for electrical safety Know how to calculate electrical power Know that the kilowatt-hour is a unit of energy used to measure electrical usage Be able to compare magnetic poles to electric charges - how are the similar and how do they differ Be able to compare magnetic lines of force to electric lines of force (i.e. compare magnetic field lines to electric field lines) Realize that an electric current can create a magnetic field Realize that a current (or moving charge) in a magnetic field can experience a force depending on the angle between the two Be able to describe the motion that occurs for charges moving parallel and perpendicular to the magnetic field Appreciate the fact that the earth's magnetic north pole is actually a south magnetic pole Realize that the magnetic north pole is not located exactly at the geographic north pole. Know how objects become magnetized Know how permanent magnets can be destroyed Know that a changing magnetic field in a circuit can generate an electrical voltage or current in the circuit
Homework	Computer Exercise - Complete before class on 17-Apr -- materials for this exercise will be passed out in class.(note: although you are encouraged to work with a partner, EACH student must submit his/her own work for this exercise) Chapter 20 Questions: 2, 5, 7, 15, 16, 18, 28, 34, 36, 39, 51 Chapter 20 Exercises: 3, 6, 21 Chapter 21 Questions: 1, 2, 6, 11, 12, 17, 18, 30, 33, 37, 44, 45 Chapter 21 Exercises: 1, 6, 13, 19, 20