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Description
The second tv programme for this course is strongly linked to the second course unit on Magnetism and Electromagnetic induction. A number of historical experiments on the nature of magnetism and it...s relationship to electric current are demonstrated in the programme.
The second tv programme for this course is strongly linked to the second course unit on Magnetism and Electromagnetic induction. A number of historical experiments on the nature of magnetism and it...s relationship to electric current are demonstrated in the programme.
| Module code and title: | TS282, Electromagnetics and electronics |
|---|---|
| Item code: | TS282; 02 |
| First transmission date: | 05-02-1972 |
| Published: | 1972 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:24:21 |
| + Show more... | |
| Producer: | Michael Weatherley |
| Contributors: | Peter Chapman; John Sparkes |
| Publisher: | BBC Open University |
| Keyword(s): | Arago's disc; Barlow's wheel; Conductor; Electric current; Faraday's experiments; Fleming's left-hand rule; Forces; Nature of magnetism |
| Footage description: | Shot of a painting showing Michael Faraday addressing the Royal Institution in 1831. Commentary quotes Faraday speaking on the inductive effect of electric current. Chapman introduces the programme. Chapman with a model of Ampere's experiment which investigated the forces between two current carrying wires. Chapman explains the experimental set up, does the experiment, and explains the results. Shot of Barlow's wheel rotating. Commentary explains the components of Barlow's wheel. Chapman introduces John Sparkes who will do an experiment to show relative direction of magnetic fields. Sparkes explains his experimental set-up and then does the experiment. A metal foil with an electric current passing through it is attracted or repelled by a magnet. Sparkes shows that Fleming's Left Hand Rule predicts direction of movement. Chapman with Barlow's wheel. He applies Flemings Left Hand Rule and Ampere's Law to the wheel. The wheel turns as predicted by the rule. John Sparkes sums up the state of knowledge of electromagnetism at the time Faraday started work on electromagnetic induction. He discusses two separate lines of development of ideas on electromagnetism with the aid of a diagram. This serves as an introduction to the rest of the programme. Sparkes introduces P. Chapman who will do Arago's Disc experiment. Chapman with the apparatus for Arago's Disc. He explains the function of each component of the apparatus. Chapman explains how Arago's Disc stimulated Faraday's thinking on electromagnetic induction. Chapman with a model of Faraday's experimental set up. He re-creates the experiment by which Faraday discovered the principle of electromagnetic induction. John Sparkes aids. Sparkes operates a model of the apparatus which Faraday built to induce a steady DC current, (permanent magnet and copper disc.) Sparkes sums up Faraday's discovery. Chapman shows that production of a current in a changing magnetic field can explain the operation of Arago's Disc. Chapman operates the disc. He then replaces the aluminium disc with a plastic one. No rotation takes place. |
| Master spool number: | 6LT/70252 |
| Production number: | 00521_2102 |
| Videofinder number: | 697 |
| Available to public: | no |
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