Exit to G3 Physics and O-Level Magnetism & Electromagnetism Hub

Motor, Generator & Transformer Lab

Read clear SVG diagrams for force direction, motor rotation, alternating generator output, and transformer ratios with misconception-focused feedback.

SEC G3 Physics 2027

Learning goals

Describe experiments showing the force on a current-carrying conductor in a magnetic field
Describe magnetic force on a charged-particle beam
Predict force reversal when current or field reverses
Use Fleming’s left-hand rule
Explain the turning effect on a current-carrying coil

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Change one variable at a time and watch the model respond.

Lab setup

Main mode

Machine setup

Motor-effect controls

Direction and ratio controls

Magnetic field direction

Current through the wire

Coil angle in the motor45°

Coil angle in the generator90°

Primary coil turns200

Secondary coil turns600

Primary supply voltage120 V

Load current drawn from the secondary2.0 A

Primary current type

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Practice run

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Study lensPredict force direction and turning effect from field and current directions in motor-effect setups.13 min activity

Try this

Track one cause at a time: field and current for force, motion for induction, turns ratio for transformer voltage.

Learn to

Predict force direction and turning effect from field and current directions in motor-effect setups.
Distinguish clearly between split-ring commutators, slip rings, generator action, and motor action.
Use transformer ratios and power reasoning without claiming free energy or steady-d.c. induction.

Exam transfer

Force direction
Motor effect
Electromagnetic induction

Governing idea

Motors convert electrical input to mechanical output; generators use changing flux to induce emf; ideal transformers obey Vₛ/Vₚ = Nₛ/Nₚ.

Model boundary

Fields, coils, commutation, and transformer coupling are simplified. The ideal transformer relation ignores winding resistance, leakage flux, and core losses.

Avoid this trap

A transformer requires changing magnetic flux, so a steady d.c. input does not produce continuous transformer action.

How to explore

Step through motor effect, d.c. motor rotation, a.c. generator output, and transformer ratios with clear direction cues and graphs.

Predict the outcome, change one variable at a time, then interpret the result. Completion records participation only and does not award mastery.

About this activity

Read clear SVG diagrams for force direction, motor rotation, alternating generator output, and transformer ratios with misconception-focused feedback. A text explanation and no-JavaScript route remain available.

How this activity affects progress

Course and syllabus information

Course: SEC G3 Physics
Edition: SEC G3 Physics 2027