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The Electrical Trinity: Voltage, Current, and Resistance Voltage as Potential Energy Voltage is often misunderstood as a measure of electricity itself, but it is actually a measure of potential energy per unit charge. Think of it as water pressure in a pipe. When you connect a circuit, voltage provides the "push" that drives electrons through the conductive path. In practical terms, if you are powering a 5V sensor, that 5V figure is the pressure available to move data and power the chip. Ignoring voltage requirements leads to devices that simply won't turn on or behave erratically. Current as Flow Rate...