Practice Problem 7.5 Determine i, i.. and v, for all i in the circuit shown in Fig. 7.22. Assume that the switch was closed for a long time. It should be noted that opening a switch in series with an ideal current source creates an infinite voltage at the current source terminals. Clearly this is impossi- ble. For the purposes of problem solving, we can place a shunt resis- tor in parallel with the source (which now makes it a voltage source in series with a resistor). In more practical circuits, devices that act like curent sources are, for the most part, electronic circuits. These circuits 18 A will allow the source to act like an ideal current source over its oper- ating range but voltage-limit it when the load resistor becomes too large (as in an open circuit). 3 2 www 1=0 IH Figure 7.22 For Practice Proh 75

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Sinusoids And Phasors

Sinusoids are defined as the mathematical waveforms that are used to describe the nature of periodic oscillations.

Circuit Theory

Electric circuits are a network that comprises of a closed-loop, which helps in providing a return path for the current through a switch. When the switch is activated, the load operates, and the current accepts a path to finish the circuit at a low potential level from the opposing high potential level. Electric circuits theory is a linear analysis that helps in establishing a linear relation of voltage and current for R (resistance), L (inductance), and C (capacitance).