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ECE 201 Electric Circuits
Spring Quarter 2025-2026
Homework #1
Due: April 5, 2026 (11:59 pm)
Submit all pages in order behind this cover sheet
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Problem 1:
(a) Determine the time required for a 12 amp battery charger to deliver 4800 C.
(b) A lightning bolt carrying 30,000 amps and lasting for 50 microseconds strikes an airplane
flying at an altitude of 20,000 feet. How much charge is deposited on the plane by this
lightning bolt?
(c) A 12 volt battery delivers 100 J of energy in 5 seconds to a device. Determine the amount
of charge supplied and the current delivered
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Problem 2:
The current flowing into a device is given by the waveform.
(a) Calculate and plot the resulting charge and give the value entering the device at t = 1, 3
and 4.5 seconds.
(b) Calculate and plot the power absorbed by the device and give its value at t = 1, 2.5, 4.5
and 5.5 seconds.
(c) Calculate the amount of energy absorbed by the device between 0 and 6 seconds.
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Problem 3:
The charge entering a device is shown by the following waveform. Determine and
plot the power supplied to the device.
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Problem 4:
circuits.
Calculate the power that is absorbed or supplied by each device in each of the
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Problem 5:
Find Ix in the circuit using Tellegen’s Theorem (conservation of power) showing
all calculations.
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Problem 6:
Apply the law of conservation of power (Tellegen’s Theorem) to determine I0,
showing all calculations.
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