Interactive Physics
WattsUp
Learn how circuits work — explore Ohm's Law, series & parallel circuits, and build your own. Powered by a real backend simulation engine.
Lesson 01 — Basics
What is a Circuit?
A circuit is a closed loop that allows electric current to flow. It needs a power source, a conductive path, and a load to do useful work.
Lesson 02 — Ohm's Law
Ohm's Law
The relationship between voltage, current, and resistance — the foundation of all circuit analysis.
Lesson 03 — Series
Series Circuits
In a series circuit, components are connected end-to-end in a single path. The same current flows through every component.
Lesson 04 — Parallel
Parallel Circuits
In a parallel circuit, components share the same two nodes. Each branch has the same voltage but can carry different currents.
Lesson 05 — Power
Electrical Power
Electrical power is the rate of energy transfer. Three equivalent formulae let you calculate it from any two known quantities.
Circuit Lab
Simulation Lab
Configure a circuit and simulate — results come from the backend calculation engine.
Series Circuit