1. Review

2. Resistors in Series

3. Resistors in Parallel

4. Conceptual Example: Series or Parallel?
The lightbulbs below are identical and have identical resistance R. Which configuration produces more light?

5. Electric Power

7. Which circuit offers the greater resistance to the battery, two bulbs in series or two bulbs in parallel?
If a string of five bulbs in series is added in parallel to a single-bulb circuit, you find that the brightness of the original bulb does not change. Has the current through the battery increased, decreased, or stayed the same? Has the resistance of the circuit increased, decreased, or stayed the same? Explain.
Two bulbs in series are connected to a battery. The current in the first bulb is found to be 1 Ampere. What is the current through the battery?

8. Magnets and Magnetic Fields

9. Electric current produces a magnetic field!!!

10. Direction of Magnetic Field Produced by a Current-Carrying Wire: Right-Hand Rule

11. Force on an Electric Current in a Magnetic Field.

12. Important: the direction of the force is always perpendicular to the direction of the current and also perpendicular to the direction of the magnetic field.

13. Another Right-Hand Rule (for the Force)

14. Magnetic Field Due to a Straight Wire

16. Force between Two Parallel Wires

17. Each current produces magnetic field that is “felt” by the other wire so that each must exert a force on the other.

18. Electromagnetic Induction and Faraday’s Law.

19. Faraday’s Law of Induction
Faradey showed that if the number of magnetic field lines (magnetic flux) passing through a loop of wire changed for any reason, a current was produced in this loop.

20. Lenz’s Law
An induced current always a magnetic field opposes the original change in magnetic flux.

21. Reflection

22. Law of Reflection
The angle of incidence equals the angle of reflection.

23. Real and Virtual Images

26. Thin Lenses