Lecture_3_a - Basic Electric Circuit Concepts Basic...

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1 BME 311 Network Theory John X.J. Zhang, UT Austin 1 Basic Electric Circuit Concepts Basic Quantities: Power We adopt a passive sign convention in order to define the sign of supplied power and the sign of absorbed power. Consider the following. load source I + _ v s + _ v L Power supplied : If the assumed direction of the current leaves the assumed positive polarity of the voltage, power is supplied. Power absorbed : If the assumed direction of the current enters the assumed positive polarity of the voltage, power is absorbed. BME 311 Network Theory John X.J. Zhang, UT Austin 2 Basic Electric Circuit Concepts Basic Quantities: Power We consider the following examples: _ + v = 5 v + - v = 5 v + v = 5 v _ + v = 5 v I=4A I=4A I=4A I=4A (a) P = 20W (b) P = 20W (c) P = -20W (d) P = -20W absorbed ? ? ?
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2 BME 311 Network Theory John X.J. Zhang, UT Austin 3 Basic Electric Circuit Concepts Circuit Elements: We classify circuit elements as passive and active. Passive elements cannot generate energy. Common examples of passive elements are resistors, capacitors and inductors. We will see later than capacitors and inductors can store energy but cannot generate energy.
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Lecture_3_a - Basic Electric Circuit Concepts Basic...

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