Electromagnetic effects

About this lab: Electromagnetic effects

Interactive simulation for Cambridge IGCSE Physics 0625 topic 4.5 Electromagnetic effects: push a magnet into a coil and watch the galvanometer kick and the induced e.m.f. trace, spin a coil in a field to generate an alternating output matched to the coil angle, set the current and field on a wire to see the motor-effect force from Fleming's left-hand rule, a d.c. motor with dots and crosses and a split-ring commutator, a transformer with adjustable turns on a soft iron core that gives nothing on d.c., and the I squared R loss in transmission cables at different grid voltages.

IGCSE Physics 0625, topic 4.5. Electromagnetic induction, the a.c. generator, the motor effect, the d.c. motor, transformers and power transmission.

Electromagnetic effects is a free, browser-based simulation for Cambridge IGCSE Physics 0625 (topic 4 Electricity and magnetism, section 4.5 Electromagnetic effects). The course is assessed in Papers 1 and 2 (multiple choice), 3 and 4 (theory), 5 (practical test) and 6 (alternative to practical). There are 6 tabs, each a self-contained experiment with its own controls and live readings, and nothing to install: it runs on a laptop, tablet or classroom projector.

Syllabus coverage

• 4.5.1 Know that a conductor moving across a magnetic field or a changing magnetic field linking with a conductor can induce an e.m.f. in the conductor
• 4.5.1 Describe an experiment to demonstrate electromagnetic induction
• 4.5.2 Describe a simple form of a.c. generator (rotating coil or rotating magnet) and the use of slip rings and brushes where needed (Supplement)
• 4.5.2 Sketch and interpret graphs of e.m.f. against time for simple a.c. generators and relate the position of the generator coil to the peaks, troughs and zeros of the e.m.f. (Supplement)
• 4.5.3 Describe the pattern and direction of the magnetic field due to currents in straight wires and in solenoids
• 4.5.4 Describe an experiment to show that a force acts on a current-carrying conductor in a magnetic field, including the effect of reversing: (a) the current (b) the direction of the field
• 4.5.5 Know that a current-carrying coil in a magnetic field may experience a turning effect and that the turning effect is increased by increasing: (a) the number of turns on the coil (b) the current (c) the strength of the magnetic field
• 4.5.6 Describe the construction of a simple transformer with a soft-iron core, as used for voltage transformations
• Lessons on this topic: Electromagnetic induction: inducing an EMF, The A.C. generator (slip rings, EMF graphs), Magnetic effect of a current (solenoids, relays, loudspeakers), Force on a current-carrying conductor, The D.C. motor (split-ring commutator).

Full syllabus map: IGCSE Physics 0625 topic 4.

How to use this simulation

1. 1. Induction.
2. 2. A.c. generator.
3. 3. Motor effect.
4. 4. D.c. motor.
5. 5. Transformers.
6. 6. Transformer equations.
7. The buttons at the end of the tab strip give the scene the whole window (Full screen, Hide controls) and, on a dark stage, a projector-friendly palette (Light scene). Many scenes also have drag handles: drag them to change the set-up directly.

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