Emergency Crank Flashlight
Approximately how much energy can be generated from a portable hand-crank device?
I've seen a few kinds of emergency radios (like the ones that NPR stations give away during pledge drives).. and I was wondering how much energy could be generated by hand operated devices? Do radio have such low power requirements that hand cranks are convenient? Or can other devices be used with hand cranks.. and if so, what kind of devices..? Not laptops, but.. phones? not (really) flashlights, but maybe simple calculators?
This model can generate up to 10V and 300 mA
http://scientificsonline.com/product.asp?pn=3038029&bhcd2=1174201504
You can also make your own!
http://www.creative-science.org.uk/gen1.html
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US $19.99
For comparison shopping
we also bring you the results below from amazon.com
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Kaito KA404 Emergency Hand Crank Dynamo 5-LED Flashlight with AM/FM radio List Price: $24.95 Sale Price: $10.78 Average Rating:   |
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The Kaito KA404 combines a sturdy 5-LED flashlight with an AM/FM radio, giving users a handy versatile camping accessory, job site companion, car gadget or in an emergency situation, such as a hurricane or an earthquake... |
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Emergency Radio Dynamo Hand Crank Radio Flashlight 4in1 for Emergency Disaster Preparedness, Earthquakes, Fires, Flood, Hurricanes, Survival Kits, Camping, Sale Price: $16.99 Average Rating:  |
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State of the art dynamo 4 in 1 flashlight with 3 bright LEDs, Am/Fm radio, emergency siren, and cell phone charging capabilities with an adapter (adapter sold separately). The high efficiency dynamo system allows one minute of winding to create enough power for 1 LED to last an hour and a half or 3 LEDs to last for 30 minutes... |
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Snap-on 92179 8-LED Crank Emergency Flashlight with AM, FM, Weather Band and NOAA List Price: $39.99 Sale Price: $34.62 Average Rating:  |
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Snap-on 8-LED Crank Emergency Flashlight with AM, FM, Weather Band and NOAA never creates a need to replace the batteries. Includes AM/FM/Weather Radio/NOAA alert and 8 bright white LED bulbs rated up to 100,000 hours of continuous service... |
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Kaito KA404R Emergency Dynamo 5-LED Flashlight with AM/FM radio & Siren List Price: $29.95 Sale Price: Too low to display Average Rating:  |
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The Kaito KA404 combines a sturdy 5-LED flashlight with an AM/FM radio, giving users a handy versatile camping accessory, job site companion, car gadget or in an emergency situation, such as a hurricane or an earthquake... |
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Solar / Hand-Crank Powered Emergency Flashlight, Radio, & Cell Phone Charger List Price: $34.95 Sale Price: $24.95 Average Rating: |
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The unit uses a rechargeable Ni-Cad battery: a rechargeable battery that has the ability of recharging over 500 times. This remarkable radio and light recharges these batteries using either the hand crank and/or solar panel to charge them... |
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Kaito Emergency Crank Dynamo 5-LED Flashlight with AM/FM radio, KA503 List Price: $29.95 Sale Price: $14.90 Average Rating: |
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The Kaito RD335A combines a sturdy 5-LED flashlight with an AM/FM radio, giving users a handy versatile camping accessory, job site companion, car gadget or in an emergency situation, such as a hurricane or an earthquake... |
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Kaito KA5LED Dynamo 5-LED Flashlight List Price: $29.95 Sale Price: $4.99 Average Rating: |
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Are you ready to go camping this summer and are you tired of reaching for your flashlight only to find that the batteries are dead? The Kaito Dynamo/Crank flashlight is the answer to your problem! It features 5 super bright white LEDs, each is rated at 15,000 MCD, so it's about 20 times brighter than the hand shake type or squeeze type and 4 times brighter than those 3-LED flashlight you will find elsewhere... |
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Life Gear PSD6in1DC Personal Safety Device with DC Inlet, Black List Price: $24.95 Sale Price: $12.94 Average Rating: |
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LED FLASHLIGHT FM RADIO SIREN PERPDIG CLOCK CELL CHRGR FLASHER TRIPWR |
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EZ 65001-3PACK 65001 Handcrank Emergency 5 LED Hand Crank Flashlight 3 Pack - 1 x BLUE, 1 x RED and 1 x BLACK List Price: $29.99 Sale Price: $13.74 |
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This hand crank, compact LED light is a must have for any emergency situation. Simply hand crank the power generator, and the bright LED light will provide the emergency light you need for your car, boat home or company... |
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SOS Charger ® Hand-Crank Emergency Cell Phone Charger with 3 LED Flashlight List Price: $24.99 Sale Price: $24.99 |
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Charge your cell phone and light the way when you need it most. For travel, auto/boat, outdoors and emergencies. What would you do in an emergency situation only to have no power on your mobile phone? How many times have you reached for your flashlight just to find the battery dead, especially during a power outage? SOS Charger is the perfect solution for these scenarios and more! Compact, small and reliable, the SOS Charger is powered by you-simply wind the handle to generate the power needed to make a quick call, send a text message, and light the way! Fast reliable charging, powered by YOU: Recharging your mobile phone or USB-powered device (such as Bluetooth headsets) is as simple as turning the handle... |
