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Electromagnetism Intermediate

Charge, circuits, fields and induction — the physics behind all electrical engineering.

4 lessons 7 tasks

📚 Lessons

1 Charge & current

Electric charge is measured in coulombs; current I is charge flow per second (amperes). Voltage is energy per unit charge (volts). Conventional current flows from + to −.

2 Ohm's law & circuits

Ohm's law: V = IR. Power P = VI = I²R. In series, resistances add (R = R₁+R₂) and current is shared; in parallel, 1/R = 1/R₁ + 1/R₂ and voltage is shared.

3 Electric & magnetic fields

Charges create electric fields; moving charges create magnetic fields. A current-carrying wire in a magnetic field feels a force (the motor effect) — the basis of electric motors and loudspeakers.

4 Electromagnetic induction

Faraday's law: a changing magnetic flux induces a voltage. This powers generators, transformers and inductive charging. Lenz's law states the induced current opposes the change that caused it — a consequence of energy conservation.

📝 Tasks

7 tasks across 3 pages — multiple-choice and fill-in (type the answer). Score 70% or higher to earn your certificate.

🎓 Certificate of Completion

🔒 Pass the quiz above (70%+) to unlock your downloadable certificate.