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a collection of torches, lights and lamps for a variety of purposes .... Design and make a new type of battery-powered light which satisfies certain needs ...
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www.standards.dfes.gov.uk/word/primaryschemes/det4c.doc
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A rechargeable, battery-free LED torch which gets it's power from USB and stores it in a capacitor. WHY? I reckon USB stuff is cool. I also reckon LED stuff is cool. I HATE paying for batteries. I love my shaky torch. Putting all this to...
http://blog.makezine.com/archive/2006/10/how_to_battery...
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Describes how to make a flashlight. ... DO NOT dispose in fire, recharge, put in backwards, or mix with used or other battery types. This may cause batteries to explode, leak and cause personal injury ... Steps to Make a Flashlight...
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www.energizer.com/learning-center/science-center/Pages/...
www.energizer.com/learning-center/science-center/Pages/make-flashlight.aspx
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All experiments use safe, low-voltage battery power. Household electrical current contains ... Studying Oersted's Experiment and electromagnetism led to new ways of harnessing electric power. One way is the electromagnet, which has many practical applications. This experiment shows you how to make an electromagnet.
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www.energizer.com/learning-center/science-center/Pages/...
www.energizer.com/learning-center/science-center/Pages/make-electromagnet.aspx
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By trial and error I discovered that one of these per torch was not sufficient to stop the dowel from catching on fire, ... Wrap one end in electricians tape, or bicycle handlebar tape, or tennis racket handle tape to make a (slightly) padded grip. Before you wrap the handle you should consider adding a couple of those...
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www.juggling.org/help/torches/making.html
www.juggling.org/help/torches/making.html
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Today, we are learning about how to make a battery. In this clip, we are going to take an ordinary lemon and turn it into a battery powerful enough to illuminate an LED. In order to start, you need to take your lemon, put it on the table and gently roll it back and forth.
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www.monkeysee.com/play/6355-how-to-make-a-lemon-battery
www.monkeysee.com/play/6355-how-to-make-a-lemon-battery
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Here's a really cool flashlight that uses 2 capacitors to power the whole thing. Best of all, the capacitors only need to be charged 3 minutes to last ... DIY HACK – How to make a USB Charging Flashlight ... Laptop DIY – How to Recharge Your Laptop via External Battery!
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zedomax.com/blog/2009/03/24/flashlight-diy-how-to-make-...
zedomax.com/blog/2009/03/24/flashlight-diy-how-to-make-a-battery-less-flashlight/
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Normally, you connect some type of load to the battery using the wire. The load might ... Inside the battery itself, a chemical reaction produces the electrons. The speed of electron production by this chemical reaction (the battery's internal resistance) controls how many electrons can flow between the terminals.
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www.howstuffworks.com/battery.htm
www.howstuffworks.com/battery.htm
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In this activity, you will learn how to build a battery from potatoes. Along the way, you will answer the following questions: ... Now that you know how to make a potato battery, and know what voltage and current are, you will try to make a better battery.
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cosmology.berkeley.edu/Education/DEMOS/Potato_Power/Pot...
cosmology.berkeley.edu/Education/DEMOS/Potato_Power/Potato_Teacher.html
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