# UNIVERSITY OF MASSACHUSETTS DARTMOUTH COLLEGE OF ENGINEERING ```UNIVERSITY OF MASSACHUSETTS DARTMOUTH
COLLEGE OF ENGINEERING
EGR 101 INTRODUCTION TO ENGINEERING I
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This assignment is due Thursday, October 11, 2012.
Use engineering papers.
Present your work neatly and clearly.
Problem 1
Resistors are rated not only in terms of resistance, but also in terms of their ability to
dissipate power without burning. For example, if you use a resistor rated to dissipate 2 W
in a circuit where the voltage and current conditions require that the wire dissipates 3 W
then the wire will burn, and the circuit may be damaged. The ratings of resistors are
given in section 2.3.5. on p. 56.
Chapter 3: solve problem 15 on p. 93, and refer to section 2.3.5 on p. 56 in order to select
the required power rating.
Problem 2
Chapter 3: problem 27 on p. 94.
The range of possible current values is found by calculating the minimum and maximum
V
values of the current. If you consider Ohm’s law in the form of I  , then you can
R
infer that for fixed voltage, as R increases, I decreases, and vice versa.
Use the 4-band color code of the resistor to find its nominal value and tolerance. From
this information find the minimum and maximum values of resistance and the
corresponding currents.
Problem 4
Refer to Figure 3.2 (a) on p. 77. What is the % setting of the potentiometer if its
resistance rating is 2.5k ?
Problem 5
Chapter 4: problem 5 on p. 122.
Problem 6
Chapter 4: problem 9 on p. 122.
Problem 7
Chapter 4: problem 13 on p. 122.
Problem 8
Chapter 4: problem 17 on p. 123.
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