Dynamo: Generator consisting of a coil (the armature) that rotates between the poles of an electromagnet (the field magnet) causing a current to flow in the armature
Malawian engineer and inventor Cedrick Ngalande's firm GreenErg says towing a set of rubberised wheels on a leash (right) could help.
The idea is that the device can be attached to any moving object, from a person walking to a cart.As its rubber-coated wheel rolls along the ground, a dynamo generates valuable electricity that could be used to charge a lamp or cellphone.
At this point, cellphones are increasingly becoming key to economic activity in many areas of the world with poor infrastructure.
"At normal walking speeds we have gotten more than 2 watts, which is more than enough for running cellphones or radios,"
"I envision that people will attach this to themselves and walk with it-or even attach it to an ox-cart,a skating board, bike, etc."
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