Lecture Notes for Analog Electronics

Lecture Notes for Analog Electronics Raymond E. Frey Physics Department University of Oregon Eugene, OR 97403, USA. December, 1999. Class Notes 1. 1 Basic Principles In electromagnetism, voltage is a unit of either electrical potential or EMF. In Electronics , including the text, the term voltage refers to the physical quantity of either potential or EMF. Note that we will use SI units, as does the text. As usual, the sign convention for current I = dq/dt is that I is positive in the direction which positive electrical charge moves. We will begin by considering DC ( constant in time) voltages and currents to introduce Ohm's Law and Kirchoff's Laws. We will soon see, however, that these generalize to AC. Ohm's Law For a resistor R, as in the Fig. 1 below, the voltage drop from point a to b, V = Vab = Va Vb is given by V = IR.

The power dissipated by the resistor is P = VI=I2R=V2=R. 1.2 Kircho ’s Laws Consider an electrical circuit, that is a closed conductive path (for example a battery con-nected to a resistor via conductive wire), or a network of interconnected paths. 1. For any node of the circuit P in I = P out I. Note that the choice of \in" or \out" for

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