A plot v s versus i s b construct a circuit model of

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a) Plot v s versus i s . b) Construct a circuit model of the practical source that is valid for 0 ≤ i s ≤ 24 mA , based on the equation of the line plotted in (a). (Use an ideal voltage source in series with an ideal resistor.) c) Use your circuit model to predict the current delivered to a 1 kΩ resistor connected to the terminals of the practical source. d) Use your circuit model to predict the current delivered to a short circuit connected to the terminals of the practical source. e) What is the actual short-circuit current? f) Explain why the answers to (d) and (e) are not the same. Fig.(11) 12) It is often desirable in designing an electric wiring system to be able to control a single appliance from two or more locations, for example, to control a lighting fixture from both the top and bottom of a stairwell. In home wiring systems, this type of control is implemented with three-way and four-way switches. A three- way switch is a three-terminal, two-position switch, and a four-way switch is a four terminal, two-position switch. The switches are shown schematically in Fig.(12-a), which illustrates a three-way switch, and Fig.(12-b), which illustrates a four-way switch. a) Show how two three-way switches can be connected between a and b in the circuit in Fig. (12-c), so that the lamp l can be turned ON or OFF from two locations.
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