Electric Current Fundamentals
Electric current forms when electric charges (typically electrons) move continuously through a material. These electrons only flow when there's a difference in electric potential energy between two points.
Voltage, also called potential difference, is what drives current flow and is measured in volts (V). Think of voltage like electrical "pressure" - the greater the voltage, the more electric charge flows. Small voltage differences result in little movement of charge, while larger voltage differences push more charge through a circuit.
Current describes the actual rate at which electric charge flows, measured in amperes (A). The ampere measurement tells you how many electrons pass a point in a given amount of time.
💡 Quick Tip: Imagine water flowing through pipes - voltage is like the water pressure pushing the water, while current is the actual flow rate of the water passing through the pipe.
Important terms to know include conductors (materials that easily allow electricity to flow), insulators (materials that resist electrical flow), resistance (measured in ohms - the opposition to electron flow), semiconductors (materials with conductivity between insulators and conductors), and superconductors (materials with zero resistance at extremely low temperatures).
