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Vikash and Josh reviewed series-parallel circuit analysis, applying Ohm's Law and Kirchhoff's Laws to solve for current and voltage in parallel circuits. They also discussed AC circuits, including the generation of alternating current and the differences between AC and DC. Vikash will provide Josh with notes summarizing the formulas and concepts covered, and they scheduled the next session for Sunday, October 12th.

Vikash assisted a learner from the University of Southern California in Los Angeles in reviewing number systems, including binary, octal, and hexadecimal, and practicing conversions between decimal and binary numbers. They also discussed seven-segment displays and how binary inputs are used to display hexadecimal digits. The lesson involved problem-solving related to number conversions and understanding the logic behind seven-segment displays.

Vikash and Josh reviewed series and parallel circuits, including calculations for equivalent resistance, current, and power. Josh practiced simplifying a complex circuit and calculating total current. Vikash recommended that Josh review the textbook on power, energy, series, and parallel circuits and to underline any terms or calculations he does not understand.

Vikash provided assistance to Baegy in mastering operational amplifiers, a core topic in electronics. Their discussion and problem-solving covered various configurations, including inverting, non-inverting, summing, and multi-stage amplifier designs. They also revisited essential circuit analysis principles such as KCL, nodal analysis, virtual ground concepts, and impedance. This lesson featured practical calculations for voltage gain, output voltage, input impedance, and maximum operating frequency. The next lesson is scheduled to delve into integrator and differentiator circuits.

Vikash assisted a student from Florida International University in Miami in analyzing an op-amp circuit with multiple inputs. The lesson focused on virtual ground, gain calculation, and output voltage determination. The student raised a question about handling unequal input resistors, which Vikash plans to investigate further. They agreed to reconnect after a break for Vikash to clarify the discrepancy in the output voltage calculation.

Vikash taught Josh about nodal analysis, including identifying nodes, applying Kirchhoff's Current Law (KCL), and solving for unknown voltages. They worked through two circuit examples and discussed current and voltage division rules. Josh was assigned problems from the VK Mehta textbook on nodal analysis for further practice.