From magnetic force to shaft rotation, and why motors need commutators, windings, and losses
3 sections · 6 lessons
Define the motor effect on a current-carrying wire and turn linear magnetic force into the idea of torque on a loop.
2 lessonsExplain commutation and multi-coil armatures, showing how current reversal and winding layout keep torque in the same direction and reduce ripple.
2 lessonsCompare brushed DC and induction AC torque mechanisms, then trace the energy conversion path and identify the main losses that limit efficiency.
2 lessonsElectric motors start with a magnetic force on a current-carrying wire, but turning that force into steady rotation takes more than one simple loop. This course builds an intuitive picture of how torque, commutation, armature windings, and motor type determine whether electricity becomes smooth mechanical motion. It is aimed at beginner-to-intermediate learners who want to understand the working parts of brushed DC and induction AC motors without getting buried in heavy math. By the end, the full energy path from electrical input to rotating output will make sense, along with the main losses that limit efficiency.
The course covers the motor effect on a wire, torque on a current loop, and the need for commutators and brushes in brushed DC motors. It also compares armature windings, brushed DC and induction AC torque production, and the electrical-to-mechanical energy conversion path with heat and friction losses.
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Three findings from decades of learning research shaped how every Fenzo lesson is built.
Average pass rate · Freeman et al., PNAS 2014
What the science says
Students in lecture-only classes are 1.5× more likely to fail.
How Fenzo does it
Every Fenzo lesson is interactive. No passive reading or watching, ever.
You work through itAI does it for you
Skill retention over time · with vs. without practice
What the science says
Offloading thinking to AI erodes the very skills you’re trying to build.
How Fenzo does it
Fenzo makes you do the thinking — guided, but never done for you.
Retrieval practiceRe-reading
Long-term recall · retrieval vs. re-reading
What the science says
Recalling information beats re-reading it for building durable understanding.
How Fenzo does it
Lessons weave in quizzes and recall prompts, so it sticks.