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1. 왜 DC vs AC를 구분해야 할까? 현대 전력·전자 시스템은 배터리, 서버, 전기차처럼 가 핵심인 영역과, 송배전/산업용 모터처럼 가 필수인 영역이 공존합니다. 어떤 값을 계산하느냐(예: , 위상 ), 어떤 부품을 쓰느냐(정류기, 인버터, 등), 어떤 안전/규격을 준수하느냐까지 파형의 본질이 모든…
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1) Why these three ideas matter Electrical machines (motors, generators, transformers, actuators) all boil down to three physical pillars: Below, we’ll build these from first principles, give you compact but rigorous equations, and then walk through six worked problems…
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Introduction to Electromagnetic Induction Electromagnetic induction is a fundamental principle in electromagnetism that explains how electric currents can be generated by changing magnetic fields. This phenomenon forms the foundation of many electrical devices, including transformers, electric generators, and inductors.…
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1) So… what exactly is an “electrical machine”? In the most conservative, textbook sense, an electrical machine is any device that converts energy between electrical and non‑electrical domains, or between different electrical forms. Concretely: You’ll also see power‑electronics converters…
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Why “time‑domain (piecewise) circuit analysis” matters When a switch flips, a source steps, or a waveform changes shape, your circuit’s differential equations also change. Time‑domain (piecewise) analysis is about tracking each interval, enforcing initial conditions at the switching instants,…
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Why “mixed DC–AC” shows up everywhere Any real-world power rail, sensor node, or amplifier stage almost always carries a DC operating point (bias) plus an AC variation (signal or ripple). Think of: Analyzing those correctly (and fast) boils down…
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If you’ve ever flipped a switch in a circuit and watched a capacitor voltage creep up (or fall) on your scope, you’ve already met the classic RC charge/discharge curve. In this post, we’ll walk through what actually happens the…
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Why should you care? You tweak a load resistor (or an antenna, or a matching network) and suddenly your circuit delivers more real power than before—then it drops again. That peak is not an accident; it’s the maximum power…