Chapter 20 Materials

 Wednesday (Today)  Don’t miss the new WA that has been posted.  Today we work on Capacitors from Chapter 20  Look at the chapter – we have already covered a lot of it!  Watch for another WA later in the week on this material.  Friday  Quiz #4  The Evan Show  Complete the chapter  Monday – Probably start the next chapter.

 am/2011/fall/ (on class website)  Cut & Past – Link doesn’t work.  Check for conflicts on Saturday, 12/3. If we can’t do that we will do Saturday, 12/10 (yuck).  If I don’t hear from you, we will go ahead with the schedule determination.  No make-up exam will be offered if you can’t make the final at that time.

Electron and hole mobility versus temperature. The doping density equals (top curve), and (bottom curve) cm -3. (For Silicon … JBB)

Find the power output of a battery with an emf of 1.6 V generating a current of 6 A (essentially the short circuit or maximum current for one of our batteries). A) 9.6 W B) 6 W C) 1 W D) 1.6 W

A 60 W bulb (240 Ohms) and a 75W (192 Ohms) bulb are in series connected to a 120 volt wall socket. Which bulb will be brighter? a. 60W b. 75W c. They use the same power since they have the same current flowing through them d. Can’t tell from this info

A 60 W bulb (240 Ohms) and a 75W (192 Ohms) bulb are in series connected to a 120 volt wall socket. Which bulb will be brighter?

Two resistors R1=300 Ohms and R2=200 Ohms are in parallel connected to a 12 volt battery. Which resistor is using more power? a. R1 b. R2 c. They use the same power since they have the same current flowing through them d. Can’t tell from this info

A B CD Consider the circuit diagram – when the circuit is completed (t=0) which graph represents the current that flows in the circuit as a function of time? From the reading assignment !

A B CD Which graph shows the MAGNITUDE of the charge on the RIGHT plate as a function of time from switch on? Last One!