ECE240 Fall 2025
Problem Set 1
(partly adapted from “Basic Electronics for Scientists”, J.J. Brophy)
Due Date: This problem set will not be graded, but the material will be covered on
Quiz 1, on September 26th
1) If a 220 kΩ resistor can handle a maximum power of 1/2 Watt, what is the maximum
current that can ow through the resistor? Through a 1 Watt, 4 kΩ resistor?
2) Find the resistance between the input terminals of the circuit below. What voltage
2
Input
2
2
2
6
2
6
2
2
2
4
2
2
applied to the input terminals produces a 1 Amp current in the 4-Ω resistor?
2
12 V
+
-
5
2
3
4
2
3) Using Kirchhoff’s laws, nd the current in the 4-Ω resistor in the circuit above.
4) Alexander & Sadiku 3.7
5) Alexander & Sadiku 3.11
6) Alexander & Sadiku 3.23
7) Alexander & Sadiku 3.45
fi
fl
8) Alexander & Sadiku 3.51