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What is it?
A changing electrical value (voltage or current) that carries information. Everything from buttons to Wi-Fi is based on signals.
The Simple Analogy
“Like a message being sent — the shape of the signal is the meaning.”
All Concepts
What is Electricity?What is Voltage?What is Current?What is Resistance?What is a Resistor?What is a Diode?What is an LED?What is a Capacitor?What is a Transistor?What is a Microcontroller?What is an Electron?What is a Conductor?What is an Insulator?What is Electrical Isolation?What is Power?What is a Battery?What is Ground?What is a Switch?What is a Circuit?What is Transconductance?What is Frequency?What is a Signal?