A microchip that contains thousands or billions of resistors, capacitors, and transistors inside a single silicon package.

Color-coded bands indicate the resistance value.

Introduce key electrical quantities:

Inductors: The Magnetic Coil Function: Stores energy in a magnetic field. It resists changes in current. Appearance: A coil of copper wire, sometimes wrapped around a ferrite (iron) core. Common Use: Power supplies, radio frequency (RF) circuits, and transformers. Visual: A schematic symbol (a squiggly line) next to a photo of a surface-mount inductor.