Amp Nerd https://validator.w3.org/feed/docs/rss2.html Blog Why Your Home Gets AC Instead of DC from the Grid Frequency Is Not Voltage: Two Different Things Can Go Wrong Brownouts and Blackouts Stress Devices in Different Ways Harmonics Are Not Just Audio—Electrical Loads Can Distort Current Why Utilities Use High Voltage to Move Power Long Distances Transformers Need Changing Magnetic Flux—Steady DC Is Different A Generator Has a Frequency Limit as Well as a Watt Limit Why Large Loads Can Cause a Brief Voltage Dip Three Phases Are 120 Degrees Apart—Why That Matters Power Quality Is More Than Staying Close to 120 Volts Home Smart Switch Needs a Neutral? The Electronics Need a Power Path No-Neutral Smart Switches Can Make LEDs Misbehave Smart Plug Says 15A—Does That Include Every Motor Load? Why a Smart Device Can Lose Its Schedule After Power Fails Wi-Fi Signal Bars Do Not Prove a Smart Device Has Internet Access A Smart Meter Reading Is Not a Real-Time Appliance Breakdown Power over Ethernet Carries Data and Power—but the Budget Is Shared A Video Doorbell Reboots at Night? Infrared Lighting Changes the Load Smart Sensors Can Report Old Data with a Fresh-Looking Screen Cloud Control and Local Control Fail in Different Ways Breadboards Have Hidden Connections That Can Fool Beginners A Bench Supply Current Limit Is Not an Instant Universal Protector Why an LED Circuit Works on Paper but Not on a Breadboard Solder Can Look Shiny and Still Make a Bad Joint Flux Residue Is Not Always Harmless—or Always Dangerous Why ESD Damage Can Be Invisible Until Later A USB Oscilloscope Still Has Ground Connections to Think About Series and Parallel Batteries Change Different Things Why a Voltage Divider Is Not a General-Purpose Power Supply A Pull-Up Resistor Gives an Input a Default—It Does Not Force Every State A Capacitor Can Hold Charge After Power Is Removed Resistor Wattage Is a Heat Limit, Not the Power It Always Uses Why LEDs Need Current Control Even on a Small Battery A Diode Is Not a Perfect One-Way Valve MOSFET Gate Voltage Can Look Right While the Device Gets Hot Relay Contacts and Relay Coils Have Different Ratings Why Inductive Loads Create a Voltage Spike When Switched Off A Thermistor Changes Resistance with Temperature—But Which Way? Why a Crystal Oscillator Is Accurate but Not Perfect Decoupling Capacitors Help Locally—Placement Changes the Result True RMS Matters Most When the Waveform Is Not a Sine Wave Continuity Beeps Do Not Prove a Connection Can Carry Load A Clamp Meter Needs the Right Conductor Inside Its Jaws Auto-Ranging Can Hide a Unit Change in Plain Sight Meter Counts and Digits: What the Display Specification Really Means Non-Contact Voltage Testers Can Miss or Misread a Situation Why Measuring Current Uses a Different Connection Than Voltage Thermal Cameras Can Misread Shiny Metal—Emissivity Is the Catch