
Circuit Foundations
Ohm's Law Explained: Voltage, Current, Resistance
Ohm's law relates voltage, current, and resistance with V = IR. Voltage is measured in volts, current in amperes, and resistance in ohms.
Circuit analysis gets easier when every symbol has a defined job. These guides connect the words, units, equations, and assumptions before asking the algebra to do any work. Examples stay conceptual and low stakes. Physical equipment belongs under manufacturer instructions and the safety controls of a supervised lab, shop, or workplace.

Ohm's law relates voltage, current, and resistance with V = IR. Voltage is measured in volts, current in amperes, and resistance in ohms.