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I want to make a dynamo which can produce electricity. My requirements for the dynamo are as follows.

  1. I need to charge my laptop through this.
  2. I want my laptop to run for 1hour with this energy produced.
  3. The dynamo should have some handle to that I can rotate it with my hand or connect to some rotating entity to generate electricity.

I want to know the following 1. How much energy required by a personal laptop to run for 1hour. 2. What are the items I need to build the dynamo? 3. What are the specifications of the items needed to build this dynamo? I need the steps and mathematical formula and calculations also, the way you calculated the specification of the item. I mean like the strength of magnet, the size of armeture, the minimum speed I should rotate the armeture etc.

Please help me building this device. I would be very much thankful to you.

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Hi Surjya - questions about device construction, except for experimental apparatus, are generally off topic here. If you would like to edit your question to ask about the physical principles involved, for example how you could calculate the power produced as a function of the magnetic field, rotation speed, etc. then that might be on topic and in that case I'd be happy to reopen it. – David Zaslavsky♦ Jan 6 '12 at 8:44
sorry david, I like to know about the calculations how to design that device. Exact apparatus specifications are not necessary. Just I need how to calculate and measure my entities required. Please reopen the question. – Surjya Narayana Padhi Jan 6 '12 at 9:04
As I said, I will be happy to reopen the question if it is edited to be on topic. If you want to know how to do some particular calculation, you can ask about that. – David Zaslavsky♦ Jan 6 '12 at 9:59

closed as off topic by David Zaslavsky♦ Jan 6 '12 at 8:42

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