convert a bicycle to an ‘e-bike’ or electric powered bike
visitors this year: 594 when you want an e-bike and you don’t want another bike:
visitors this year: 594 when you want an e-bike and you don’t want another bike:
visitors this year: 2,370 Sometimes a laptop goes into a comatose state that no amount of charging or on-offing can end. The solution might be to try the following. If you’re desperate do them...
visitors this year: 21 Battery life In this experiment an electrical cell is tested to exhaustion. The cell might be a dry-cell, an alkaline cell or a lead-acid accumulator. The decreasing voltage is measured...
visitors this year: 29
visitors this year: 24
visitors this year: 22 Batteries or electrical cells are made using different substances. There are zinc dry-cells, alkaline cells and lead-acid accumulators. When you use them, the chemicals become exhausted at different rates. So...
visitors this year: 52 Batteries are a handy source of power. You’ll know that there are different kinds of batteries, and maybe that some are good for some jobs, and some for others. But battery...
visitors this year: 38 A DNA drink to enjoy in the sun, how camping can reset your biological clock, and why the Cambridge Science Centre is the place to take the kids this summer! The Science...
rogerfrost.com is a compendium of ideas for using technology with sciencey questions in mind. Started in 1995 to offer ideas to school science teachers, Roger Frost expanded the coverage to home automation, gadgets and sensors to monitor, or understand, what’s going on around us.
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Roger Frost has been writing since 1988 and this web includes his published articles about the use of the Internet; the work of scientists and how technology is useful at home or school.
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