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lecture03

# lecture03 - Lecture#3 OUTLINE Power calculations Circuit...

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Lecture 3, Slide 1 EECS40, Fall 2003 Prof. King Lecture #3 OUTLINE Power calculations Circuit elements – Voltage and current sources – Electrical resistance (Ohm’s law) • Kirchhoff’s laws Reading Chapter 2 Lecture 3, Slide 2 EECS40, Fall 2003 Prof. King If an element is absorbing power ( i.e. if p > 0), positive charge is flowing from higher potential to lower potential. p = vi if the “passive sign convention” is used: How can a circuit element absorb power? By converting electrical energy into heat (resistors in toasters), light (light bulbs), or acoustic energy (speakers); by storing energy (charging a battery). Review: Power + v _ i _ v + i or

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Lecture 3, Slide 3 EECS40, Fall 2003 Prof. King Find the power absorbed by each element: Power Calculation Example vi (W) 918 - 810 - 12 - 400 - 224 1116 p (W) Conservation of energy Î total power delivered equals total power absorbed Lecture 3, Slide 4 EECS40, Fall 2003 Prof. King Circuit Elements There are 5 ideal basic circuit elements: – voltage source – current source – resistor – inductor – capacitor Many practical systems can be modeled with just sources and resistors The basic analytical techniques for solving
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