55 from Ch 12 MCQs - Making sense of EE MCQ Chapter 12...

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Chapter 12 Phasors Typical MCQ’s Given the circuit diagram, determine the voltages, currents, and their ratios at the given frequency and at varied frequencies Given the circuit diagram, calculate the voltages and currents using voltage and current division, as well as node voltage and mesh current methods Concepts & Strategies Under certain conditions (see below), you can use a generalized form of Ohm’s law V=I Z where the voltage V and current I are phasors (complex numbers that carry information about both the magnitude and phase shift of sine waves) and Z is the impedance – a complex equivalent of resistance (see below) The conditions are: 1. All sources in the circuit should be sinusoidal, at the same frequency ω 2. All circuit elements should be linear 3. The circuit should be in a sinusoidal steady state (all transients already vanished). In general, the impedance Z is a complex number, which means that voltage V and current I may have different phase angles.
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