Physics for the Inquiring Mind (PHYS 105)            Spring 2005 Review Problems for Thursday, March 3. [1] Using the resistors in the envelope in your box, create a network that has total resistance 40 Ohms.  Check your network's resistance by using your multimeter, and show John after you have succeeded.  After finishing, disconnect your network. [2] Using the materials in your box, design a circuit such that your red bulb is always on, but the green one is on only when the switch is closed.   [3] Using the materials in your box, set up a circuit containing two Ammeters in which one Ammeter is reading twice the current that the other one is.  Be sure to use the 10A scales when you first hook the Ammeters up to protect them. [4] Consider the two circuit diagrams shown below.  Do they represent the same circuit?  If so, label the squares in the lower circuit appropriately.  If not, describe why the two circuits are not the same. [5] In the circuit diagram below, all of the rectangles represent identical, unknown circuit elements.   Rank the amount of current flowing through each of the six items. [6] In your envelope, there is a small orange-red object with a gray stripe on one end.  This object is called a diode, and it actually cares which direction current is flowing through it!  Assuming that current flows from the positive side of your batteries to the negative side, determine whether your diode prefers current to flow from its striped end to the unstriped, or the reverse.  (As you do this, leave your diode connected for only short periods of time)