Electronics Simplified

Voltage

Symbol V, measured in volts (V)

Voltage is the electrical push that makes current flow around a circuit.

Voltage is always measured between two points, like the height difference between the tank and the tap. That is why a multimeter has two probes.

Common voltages: an AA cell 1.5 V, a USB port 5 V, an ESP32 pin 3.3 V, a car battery 12 V, Indian mains 230 V AC (dangerous).

Everything on this subject: Ohm's Law and Circuit Basics, Simplified