1. Electric Current and Circuits (RLC) General Physics Instructor: Xiao, Yong ( 肖湧 ) ， Wang Kai( 王凯 ) TA: Li, Yueyan （李跃岩） Recitation TA: Zhai, Chenyu （翟宸宇）

2. Electric Current

3. Resistance and Ohm ’ s Law

4. Battery, EMF and Terminal Voltage

6. Resistors in Series and in Parallel When two or more resistors are connected end to end along a single path, they are said to be connected in series. From Ohm ’ s law:

7. Resistors in Series and in Parallel

8. Capacitor A capacitor is a device that can store electric charge, and normally consists of two conducting objects (usually plates or sheets) placed near each other but not touching. Capacitors are widely used in electronic circuits. They store charge for later use, such as in a camera flash, and as energy backup in computers if the power fails. Capacitors also block surges of charge and energy to protect circuits.

9. Capacitor

12. Capacitor (Optional)

13. Capacitors in Series and Parallel

15. Electric Energy Storage

16. Mutual Inductance

18. Self Inductance

20. Energy Stored in a Magnetic Field

22. RC Circuit The circuits that contain both resistance and capacitance. Such a circuit is called an RC circuit. They are used in camera flashes, in heart pacemakers, and in many other electronic devices.

23. RC Circuit

25. LR Circuits

27. LC Circuits In any electric circuit, there can be three basic components: resistance, capacitance, and inductance, in addition to a source of emf. We have previously discussed both RC and LR circuits. Now we look at an LC circuit, one that contains only a capacitance C and an inductance, L. This is an idealized circuit in which we assume there is no resistance.

28. LC Circuits

30. LC Circuit

32. LRC Circuit The LC circuit discussed in the previous Section is an idealization. There is always some resistance R in any circuit, and so we now discuss such a simple LRC circuit. Same as LC circuit, we have:

33. LRC Circuit

34. Homework Capacitors in Series and Parallel P644/2 P645/22 Electric Energy Storage P646/41 Resistance and Ohm’s Law P672/7 Resistors in Series and in Parallel P699/7 Mutual Inductance Self Inductance P805/5