Part of the Physics JourneyBetaJourneyElectricity and Magnetism: Fields, Circuits and Induction
Twelve chapters, from Coulomb's law to induction. Every problem is solved in steps: set up the charges or the circuit, write the equations with units, then solve, and each step is checked.
5,917,228+ learners enrolled
51 lessons51 challenges136 quiz questions
- Beginner friendly
Hands-on interactive lessons
Quizzes to test your knowledge
Free certificate of completion
Watch the physics move
Every lesson draws its situation, and the motion plays out on screen. Here are six from the course.
Coulomb's law
A free charge next to another of the same sign is pushed away, faster and faster.
Electric fields
A small positive charge is pushed along a field line, from the positive charge toward the negative one.
Charged plates
An electron fired between two charged plates curves toward the positive plate.
Capacitors
A capacitor charging through a resistor: the charge climbs fast at first, then levels off.
Magnetic forces
A charge in a magnetic field moves on a circle, because the force always points to the centre.
Induction
A magnet pushed into a coil changes the flux through it, which induces a voltage in the coil.
Syllabus
This section is part of the Physics Journey. The full syllabus has more sections: click any preview below to view it on the Journey page.
- Section 1Mechanics94 lessons
Section 2
Electricity and Magnetism
Start sectionStartCharges and fields from zero: Coulomb's law, the electric field and potential, conductors and capacitors, electric circuits and Kirchhoff's laws, magnetic fields and forces, and induction.Electric Charge and Force
4 lessons714The Electric Field
5 lessons916Energy and Potential
4 lessons712Charged Conductors
3 lessons57Capacitors
4 lessons711Current and Resistance
5 lessons915Real Batteries
4 lessons79Kirchhoff's Laws
4 lessons79Capacitors in Circuits
4 lessons79Magnetic Fields
4 lessons79Magnetic Forces
5 lessons913Induction
5 lessons912- Section 3Optics, Waves and Modern Physics53 lessons
Learn by Solving
Solve every problem the way physicists do: choose your axes, draw the forces, write the equations with units, and the board checks each step.
Draw every force on the body, pick your axes, then write Newton's second law along them.
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Promotion zoneEvery way to learn
Read, listen, test yourself, ask the AI about your own steps, or look up anything you've already covered. Every lesson meets you where you are.
A scalar is a size only, like a mass of 3 kg or a time of 4 s. A vector has a size and a direction.
A force is a push or a pull, measured in newtons: a push of 50 N to the right is a vector.
A vector is drawn as an arrow. Its length shows the size, and the arrow points in its direction.
Earn a Certificate
Earn a certificate when you complete a section. Add it to your LinkedIn profile to show how far your physics has come.
Certificate of CompletionPhysics Mechanics
Add to LinkedInWhy learn electricity and magnetism with Coddy
- Charges and fields as vectors. Add the forces or fields of several charges along each axis, and a wrong direction or sign is named.
- Circuits you analyse yourself. Choose the direction of each current, write Kirchhoff's laws for the loops and junctions, and the check follows your choice.
- Units are part of the answer. Coulombs, volts, ohms and farads must be right, and a missing or unconverted unit is a wrong answer, as on an exam.
- Fields you can watch. Charges, field lines, plates, capacitors, loops and magnets are drawn and animated, so every number has a picture.
Frequently asked questions about electricity and magnetism
What does the electricity and magnetism section cover?
Electric charge and Coulomb's law, the electric field, energy and potential, charged conductors, capacitors, current and resistance, real batteries, Kirchhoff's laws, capacitors in circuits, magnetic fields and forces, and induction.
What is the difference between an electric and a magnetic field?
An electric field acts on any charge, moving or not. A magnetic field acts only on moving charges and currents, and its force is always at a right angle to the motion.
How do you solve a circuit problem?
Label the currents and choose a direction for each, write Kirchhoff's junction and loop laws, and solve the equations for the unknowns with their units. If a current comes out negative, it simply flows the other way.
Do I need mechanics before this section?
It helps, because forces, energy and vectors come back here, but each lesson explains what it needs. If you are new to physics, start with the mechanics section.
How long is the electricity and magnetism section?
Twelve chapters and 51 lessons, each a few minutes long. Finishing it earns a free, verifiable certificate.
Do I get a Electricity and Magnetism certificate when I finish?
Yes. When you complete the Electricity and Magnetism course you receive a free certificate of completion that you can share on LinkedIn or add to your resume.
