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We will be introducing the new Knowledge and Learning Beta website over the coming months. Clips for use in the classroom are now available on your phone, tablet or PC.


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Clip description Keywords
A short history of direct and alternating current
A short history of direct and alternating current

Duration: 02:29

An explanation of the difference between direct and alternating current and the advantages of AC for mains use.

 
How can you survive a lightning strike?
How can you survive a lightning strike?

Duration: 4:29

Presenter Greg Foot investigates just how dangerous lightning is and whether anyone can survive a direct lightning strike. He uses a Tesla coil to produce the high voltages and a Faraday cage to survive the direct lightning strike.

 
Measuring electrical resistance
Measuring electrical resistance

Duration: 02:53

Electrical resistance is measured to locate objects underground.

 
Stephen Gray's 'Hanging Boy' experiment
Stephen Gray's 'Hanging Boy' experiment

Duration: 03:18

Jim Al-Khalili explains how Stephen Gray's 'Hanging Boy' experiment demonstrates the principles of electrical conductivity.

 
Superconductors and the Meissner effect
Superconductors and the Meissner effect

Duration: 03:53

A piece of superconducting ceramic is seen causing a magnet to levitate above it. The potential for superconductors to revolutionise power transmission is discussed.

 
The dangers of electricity
The dangers of electricity

Duration: 01:27

A demonstration of the risks of approaching or touching high-voltage electrical equipment.

 
The discovery of superconductivity
The discovery of superconductivity

Duration: 02:39

A description of the discovery of superconductivity in 1911 and an explanation of how it works.

 

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