Battery Charger Meter
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 New Deluxe Solar Battery Charger w Meter For AA AAA C D Charges 2 At A Time $34.99 Time Remaining: 3d 15h 12m Buy It Now for only: $34.99 |
 Solar Panel 2 AAA AA C D Battery Charger With METER $22.90 Time Remaining: 16d 3h 28m Buy It Now for only: $22.90 |
 Solar Panel Power AA Cell 4 Battery Charger With Meter $17.00 Time Remaining: 14d 12h 5m Buy It Now for only: $17.00 |
 100w 18VDC Mono solar panel charge 12V battery+10A regulator+3Meters10FT cable $288.86 Time Remaining: 13d 8h 17m Buy It Now for only: $288.86 |
 300w 18V DC Mono solar panel +20A regulator+3Meters10FT cable+MC4 1F2M1M2F RV $699.96 Time Remaining: 13d 8h 23m Buy It Now for only: $699.96 |
 200w 18V DC Mono solar panel +20A regulator+3Meters10FT cable+MC4 1F2M1M2F RV $498.86 Time Remaining: 13d 8h 20m Buy It Now for only: $498.86 |
 100w Mono solar panel+300w grid tie inverter 14V+10A regulator+3Meter10FT cable $388.87 Time Remaining: 13d 8h 24m Buy It Now for only: $388.87 |
 300w Mono solar panel+300w grid tie inverter 14V+10A regulator+3Meter10FT cable $799.95 Time Remaining: 13d 8h 26m Buy It Now for only: $799.95 |
 200w Mono solar panel+300w grid tie inverter 14V+10A regulator+3Meter10FT cable $598.85 Time Remaining: 13d 8h 26m Buy It Now for only: $598.85 |
 300w Mono solar panel+300w grid tie inverter 14V+10A regulator+3Meter10FT cable $799.00 Time Remaining: 12d 11h 17m Buy It Now for only: $799.00 |
 300w 18V DC Mono solar panel +20A regulator+3Meters10FT cable+MC4 1F2M1M2F RV $699.93 Time Remaining: 12d 11h 16m Buy It Now for only: $699.93 |
 200w Mono solar panel+300w grid tie inverter 14V+10A regulator+3Meter10FT cable $598.83 Time Remaining: 12d 11h 17m Buy It Now for only: $598.83 |
 100w Mono solar panel+300w grid tie inverter 14V+10A regulator+3Meter10FT cable $388.83 Time Remaining: 12d 11h 17m Buy It Now for only: $388.83 |
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Panasonic EW3109W Portable Upper Arm Blood Pressure Monitor
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DescriptionThe Panasonic EW3109W Automatic Arm Blood Pressure Monitor is the first portable arm unit in the industry. The easy-fit cuff, designed for comfort and to assure correct and accurate use, rolls around the slim baton-style monitor for portability... |
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Panasonic EW3006S Wrist Blood Pressure Monitor
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Description- Panasonic wrist blood pressure monitor- Clinically proven accurate measurement- Flashing warning system for hypertensive readings- Body movement detector to eliminate inaccurate readings- Irregular pulse indicator- Movement detection- Easy to use - one touch auto inflate- 24 hour customer service hotline- Case and two AAA batteries includedPANEW3006S |
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Bayer 7393 Contour Usb Blood Glucose Monitoring System, Black
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DescriptionPlug & play USB. Plug in. Know more. Take action. No coding. Easy trend tracking. Color display. Uses Bayer's Contour Blood Glucose Test Strips: no coding technology; small blood sample (0.6 mcl); fast 5-second test time... |
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Elenco Snap Circuits Green - Alternative Energy Kit
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DescriptionWith the Elenco Electronics Snap Circuits Green Alternative Energy Kit, kids can get a hands-on, entertaining education about what green energy means. This innovative kit contains real circuit components that snap together to create working electronic circuits and devices, featuring projects designed specifically to illustrate different sources of electricity... |
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Digital 60V 100A Balance Voltage Power Analyzer Watt Meter Balancer RC Charger
Sale Price: $17.13 |
DescriptionSpecifications: Package including: |
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Racer's Edge 4400mAh Glow Starter with Meter and Charger
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DescriptionRacers Edge Blue Aluminum Glow Igniter RCE10563B |
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Equus 3721 Battery and Charging System Monitor
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Description- Easily plugs into vehicle's cigarette lighter or power receptacle to monitor battery and charging system voltage- Designed for 12-volt negative ground systems- LCD displays measured voltage with a bar graph to indicate battery charge level- Color-coded LEDs quickly identify battery's charge status- Head pivots for easy viewing, angle adjustment |
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Extra Long Black iPod / iPhone 3G, 3GS, iPhone 4 USB Charge and Sync Cable, More Than Double the Length of the Standard Cord - 2m (6.5ft) Long. UPDATE: NOW FITS IPHONE 4 BUMPER AND ALL OTHER CASES
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DescriptionThis extra long and extra convenient iPhone/iPod is great for talking or using your device while it charges. The high quality black cable will allow you to sync and/or charge your iPod/iPhone easily and from up to 6 feet. |
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Garmin Charging Cradle for Forerunner 205 and 305
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DescriptionThis replacement charging cradle charges your Forerunner 205 or 305 via AC or USB power. (AC and USB cables not included.) Product : GARMIN CHARGING CRADLE FOR FORERUNNER 205 305 Manufacturer : GARMIN PARTS Manufacturer Part No : 010-10752-00 UPC : 753759054793 |
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Car Charger for Sony PSP
Sale Price: $0.01 |
DescriptionCharge your Sony PSP while you're on the go with a car charger. This charger fits standard 12-volt DC "cigarette lighter" sockets in most cars, and has a red indicator light. Flexible cable with a maximum stretched length of about 1 meter or 3 feet. |
Battery Experiments: Voltaic Pile
If you want to learn about the electrochemical reactions used to create batteries, it is easy to do experiments at home to try out different combinations. To do these experiments accurately, you will want to purchase an inexpensive ($10 to $20) volt-ohm meter at the local electronics or hardware store. Make sure that the meter can read low voltages (in the 1-volt range) and low currents (in the 5- to 10-milliamp range). This way, you will be able to see exactly what your battery is doing.
You can create your own voltaic pile using coins and paper towels. Mix salt with water (as much salt as the water will hold) and soak the paper towel in this brine. Then create a pile by alternating pennies and nickels. See what kind of voltage and current the pile produces. Try a different number of layers and see what effect it has on voltage. Then try alternating pennies and dimes and see what happens. Also try dimes and nickels. Other metals to try include aluminum foil and steel. Each metallic combination should produce a slightly different voltage.
Another simple experiment you can try involves a baby food jar (if you don't have a baby around the house, just purchase a few jars of baby food at the market and empty them out), a dilute acid, wire and nails. Fill the jar with lemon juice or vinegar (dilute acids) and place a nail and a piece of copper wire in the jar so that they are not touching. Try zinc-coated (galvanized) nails and plain iron nails. Then measure the voltage and current by attaching your volt meter to the two pieces of metal. Replace the lemon juice with salt water, and try different coins and metals as well to see the effect on voltage and current.
Probably the simplest battery you can create is called a zinc/carbon battery. By understanding the chemical reaction going on inside this battery, you can understand how batteries work in general.
Imagine that you have a jar of sulfuric acid (H2SO4). Stick a zinc rod in it, and the acid will immediately start to eat away at the zinc. You will see hydrogen gas bubbles forming on the zinc, and the rod and acid will start to heat up. Here's what is happening:
- The acid molecules break up into three ions: two H+ (hydrogen) ions and one SO4-- (sulfate) ion.
- The zinc atoms on the surface of the zinc rod lose two electrons (2e-) to become Zn++ ions.
- The Zn++ ions combine with the SO4-- ion to create ZnSO4 (zinc sulfate), which dissolves in the acid.
- The electrons from the zinc atoms combine with the hydrogen ions in the acid to create H2 molecules (hydrogen gas). We see the hydrogen gas as bubbles forming on the zinc rod.
If you now stick a carbon rod in the acid, the acid does nothing to it. But if you connect a wire between the zinc rod and the carbon rod, two things change:
- The electrons flow through the wire and combine with hydrogen on the carbon rod, so hydrogen gas begins bubbling off the carbon rod.
- There is less heat. You can power a light bulb or similar load using the electrons flowing through the wire, and you can measure a voltage and current in the wire. Some of the heat energy is turned into electron motion.
The electrons go to the trouble to move to the carbon rod because they find it easier to combine with hydrogen there. There is a characteristic voltage in the cell of 0.76 volts. Eventually, the zinc rod dissolves completely or the hydrogen ions in the acid get used up and the battery "dies."
In the next section, we'll look at exactly what is happening with the battery's chemistry.
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