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St07 Some substances are conductors for electricity others are insulators

A light emitting diode proved that the two components of a margarine substitute show different electric conducitivities. Electric conductivity can be measured by using a multimeter.
Never use electricity from a socket, this MAY BE DEADLY!
*  Build an open circuit using a 9-Vol battery, 3 wires with crocdile clips, a multimeter and two small nails
   insulated by a rubber stopper.
*  Left: Aluminium, copper and carbon (C) from the previous experiment are excellent conductors (> 10 mA).
*  Middle: Sulfur (S) does not conduct electricity at all (0.00 mA). Sulfur is an insulator.
   Right: Tap water is a weak conductor (2.18 mA), distillierted water a bad conductor (0.2 mA).
   Explanation: Solutions of salts (Cola), pencil leads (C) and metals are conductors for electricity.

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