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Unformatted text preview: Exam General Physics 219 Fall 2010 Midterm 1 1 Problem 1 a) Compute the total resistance of the configurations in the figure. 2 Problem 2 I want to build an oscillator circuit but in the specifications it requires one 1 k resistor and one 1 . 5 k resistor. In my box I have several 3 k resistors but nothing else. a) Can you tell me how to use them to replace the 1 k and 1 . 5 k values? Namely, draw two different resistor circuits one with total resistance 1 k and the other 1 . 5 k but such that each only contains 3 k resistors. 3 Problem 3 The 78L12 is a voltage regulator. In one input the voltage is 18V and in the other is 12V. See figure. If the current going through the device is I=100mA, b) Find the value of a resistor R which would produce the same potential difference between its terminals when the same current goes through it. (see figure) a) How much power is consumed by the circuit (or equivalently, the resistor)?...
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This note was uploaded on 12/07/2011 for the course PHY 219 taught by Professor Na during the Fall '11 term at Purdue UniversityWest Lafayette.
 Fall '11
 NA
 Resistance

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