ECE240 Introduction to Electric Circuits
Fall 2025
HW#1
1. Determine the total charge entering a terminal between t=1 s and t=2 s if the current
passing the terminal is 𝑖 = (2𝑡 3 + 3𝑡 2 − 𝑡 + 5) 𝐴.
2. The total charge entering a terminal is given by 𝑞 = 3𝑡 cos 2𝜋𝑡 𝑚𝐶. Calculate the
current at t=1 s.
3. For the circuit in Figure below, find voltages v1, v2, v3.
4. Determine vo and i in the circuit shown in Figure below.
5. Find currents and voltages in the circuit shown in Figure below.
6. For the circuit shown in Figure below, determine: (a) the voltage 𝑣𝑜 (b) the power
supplied by the current source, (c) the power absorbed by each resistor.