OpenAha
00
All courses
Natural Sciences · Intermediate

Electricity & Circuits

What actually flows through a wire? Discover current, voltage and resistance, master Ohm's law, and build series and parallel circuits to see why your house is wired the way it is. Then meet real batteries, Kirchhoff's laws and the voltage dividers inside every sensor.

7 lessons~40 min0/7 complete
Start courseHelpful background: Energy
1

The Basics

Charge, current, voltage and resistance.

  1. Charge & CurrentWhat flows in a wire
  2. Voltage & Ohm’s LawPush, flow and resistance
2

Circuits

Series, parallel and power.

  1. Series CircuitsOne path, shared voltage
  2. Parallel CircuitsMany paths, same voltage
  3. Electric PowerWatts, heat and power lines
3

Real Circuits

Batteries, junctions and dividers.

  1. Real BatteriesInternal resistance and maximum power
  2. Kirchhoff & DividersTwo laws for any circuit

Courses that build on this

Ready for more? These courses use what you learn in Electricity & Circuits.

Natural Sciences · Intermediate

Capacitors & RC Circuits

Time constants, exponential charging, and the filters inside every speaker and phone.

7 lessons3 chapters
Natural Sciences · Intermediate

Electrochemistry & Batteries

Redox, the reactivity series, cells you can build, electrolysis, batteries and rust.

9 lessons3 chapters
Natural Sciences · Advanced

Magnetism & Induction

Magnets, electromagnets, motors, generators, particle steering and magnetic materials.

7 lessons3 chapters
Natural Sciences · Intermediate

The Power Grid

High-voltage lines, AC, three-phase power, balancing supply and demand, and staying safe.

7 lessons3 chapters
Natural Sciences · Advanced

Semiconductors

Band gaps, diodes, LEDs, solar cells, transistors and Moore’s law.

7 lessons3 chapters