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Unformatted text preview: 4B Homework 07 *Question 1 In the figure below, battery 1 has emf 1 = 45.0 V and internal resistance r 1 = 0.016 and battery 2 has emf 2 = 45.0 V and internal resistance r 2 = 0.019 . The batteries are connected in series with an external resistance R . (a) What R value makes the terminal-to-terminal potential difference of one of the batteries zero? (b) Which battery is that? (a) Number 0.0030 Units (b) 2 Answer a1: the number of significant digits is set to 2; the tolerance is +/-2% Answer b1: significant digits not applicable; exact number, no tolerance *Question 2 The current in a single-loop circuit with one resistance R is 5.7 A. When an additional resistance of 2.0 is inserted in series with R , the current drops to 3.0 A. What is R ? Number 2.2 Units The number of significant digits is set to 2; the tolerance is +/-2% *Question 3 When resistors 1 and 2 are connected in series, the equivalent resistance is 20.9 . When they are connected in parallel, the equivalent resistance is 4.34 . What are (a) the smaller resistance and (b) the larger resistance of these two resistors?the larger resistance of these two resistors?...
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This note was uploaded on 11/17/2010 for the course PHYC 93456 taught by Professor Afdsadsf during the Spring '09 term at City College of San Francisco.
- Spring '09