Lecture_1 - Electric circuit an interconnection of circuit...

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1 Electric circuit – an interconnection of circuit elements. There must be a closed loop for the current to flow. Circuit element each component of a circuit. * A two terminal electrical device, it can be completely characterized by its voltage and current relationship - “active” elements generate energy (voltage and current sources) -“passive” elements cannot generate energy (resistors, capacitors, inductors) This course deals with: 1. Power for an element 2. Voltage across an element 3. Current through an element
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2 Voltage (potential or emf) is the energy needed to move a unit charge between 2 points in space. It is expressed in volts (V). Voltage must be an oriented variable. The (+) and (-) signs indicate voltage polarity: + v ab - v ba = - v ab a •• b - v ba + * Above, point a is v ab potential higher than point b. * Since voltage v ba is defined with the opposite orientation, it has the opposite value of voltage v ab .
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Lecture_1 - Electric circuit an interconnection of circuit...

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