Those who still remember their school years probably have not forgotten the feeling of being part of a small miracle in a physics lesson, where the teacher clearly demonstrated the transformation of human muscle energy into electricity. Modest in size and capabilities, a dynamo machine without any wires with sockets and batteries lit a light bulb when the handle was turned - and the faster the handle was turned, the brighter it burned. To the feeling of a miracle, however, he althy skepticism was added: sockets almost at every turn, batteries in stacks. So is it worth working with your hands and feet, if here they are the fruits of great discoveries?
But what will you do when you get lost in the three pines and find that the charge of your newfangled gadget or even an old mobile phone is at absolute zero?With an idea that has already turned more than a century and a half, by the way, well known to those who in childhood drove recklessly on two-wheeled vehicles. The simplest dynamo for a bicycle,assembled literally on the knee and fixed on the front wheel, fed from the free energy of pedaling a flashlight bulb, illuminating the road like a candle.
The merits of Faraday's discovery were also appreciated by the military. In fact, a battery has value only as long as it has a charge. Having spent it, it turns into a worthless heavy object, instead of which it is better to take one more zinc with cartridges. Need energy? What about a soldier? Let him turn the handle of the generator as it should to ensure the operation of the radio. (Because that generator was nicknamed by the people - "soldier-motor".)In principle, little has changed with the advent of the era of high technology. Gadgets are gadgets, and without power supply their value is zero, especially if there is nothing to charge them with in the near future. The value of solar panels also disappears in cloudy weather or at night. The dynamo machine is more than unpretentious in this respect. If there was a person who could turn the knob, there would be current!
The pioneers in this business, of course, were the craftsmen, accustomed to the fact that almost everything in this world, including the dynamo, must be made by hand. Self-taught people did not skimp on sharing their achievements, and as a result, specialized magazines were filled with photographs and drawings of simple devices that easily recharged the batteries of flashlights, mobile phones, smartphones and GPS navigators. The lovers of cycling have not been forgotten either: a long trip is enough - andThe "on-board" dynamo will provide a full charge of an iPhone or iPad.
Finally, having seen the benefits of the practical use of visual aids of school years, professional manufacturers have followed the amateurs. Now there are enough portable devices on the market that provide the conversion of the user's muscular energy into electric current for almost any electronics. For example, a small LED flashlight that fits in the palm of your hand has a folding handle. It is enough to spin it for a minute at a speed of two revolutions per second so that the device shines for several minutes. It is also very pleasing that a dynamo specially designed for teenagers interested in science is also being sold in parallel with this equipment. By endlessly experimenting at home, you can not only figure out how to get clean electricity without batteries and accumulators, but also invent something new…
