Electric Circuits 8th Edition 49

Electric Circuits 8th Edition 49 - 2-1 V ottag C unentourcs...

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2-1 Vottag€ and Cunent Sourc€s 25 The circuit symbols Ior the ideal dependent sources are shown in Fig. 2.2. A diamond is used to represent a dependert source. Both the depeDdent current source and the dependent voltage source may be con- trolled by either a voltage ot a current elsewhere in the circuit, so there are a total of four variations, as indicated by the symbols in Fig. 2.2. Dependent sourcesare sometimes called controlled sources. To completely specify an ideal dependent voltage-controlled voltage source! you must identify the controlling voltage, the equationthat per- mits you to compute the supplied voltage ftom the controlling voltage, and the reference poladty for the supplied voltage.ln Fig.2.2(a),tlre con- trollirg voltage is named o,, the equation that determines the supplied I, = Itrx. and the reference polarity for ?r is as indicated. Note that ri is a multiply- ing constant that is dimensionless.
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