resistance

Three vintage dials labeled V, I, and R linked by brass levers and gears around the equation V = I × R, beside the title How Electronics Work, How Ohm's Law Works
How Ohm's Law Works: Mastering Fundamental Electronics Part 04
DIY Electronics
Learn how Ohm's law works: the V = IR relationship, how to solve for voltage, current, or resistance with real units, when the law applies, and how to check your answers with power.
A vintage ohmmeter dial marked with the omega symbol above a wire that narrows to a glowing, heat-shimmering constriction as charge carriers squeeze through, beside the title How Electronics Work, How Electrical Resistance Works
How Electrical Resistance Works: Mastering Fundamental Electronics Part 03
DIY Electronics
Learn how electrical resistance works: why materials oppose current, how length and thickness change it, why heat changes it, and how to measure it correctly on an unpowered circuit.