6.01 Lecture Notes - Lecture 1: Dependent Source, Operational Amplifier, Current Source

• School: MIT
• Department: Electrical Engineering and Computer Science
• Course: 6.01
• Professor: Adam Hartz

Document Summary

Circuits represent systems as connections of elements through which currents (through variables) ow across which voltages (across variables) develop. Circuits are analyzed by combining three types of equations. Kvl: sum of voltages around any closed path is zero. Kcl: sum of currents out of any closed surface is zero. We looked at three methods to systematically identify a linearly independent set. Circuit design is complicated by interactions among the elements. Adding an element changes voltages and currents throughout the circuit. Example: closing a switch is equivalent to adding a new element. By closing the switch, v decreased by more than a factor of 1000. Interactions between elements can be reduced (or eliminated) by using an op-amp as a buffer. Opening and closing the switch has no effect on i or v. When the switch is closed, the voltage across the motor is the same as the voltage at the input to the op-amp.