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Light Source Safety
Electrical circuit help! (Science project)?
I'm trying to build a circuit and i need some safety and general advice. I have a 9V duracell coppertop battery and i will have it run to a light switch with alligator clips (mini jumper cables with protective clips on the ends). Another alligator clips will run to my light and then the last clip will attach to the light bulb and run to the battery. My safety concern is about the light switch. It's an average light switch and it has 2 brass/gold nail things on the side. If I use alligator clips and connect them to my battery, is the light switch dangerous? My light switch is the switch, my light bulb is the resistor, my battery is my voltage source, and my alligator clips are my conductors.
9V is not dangerous by itself, during normal operation. However, switching on and off induces a peak current, which can be dangerous.
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Mine Safety Lamp 1973
Advantages Of LED lights
1, LED with high luminous efficiency
After decades of technological improvements, LED luminous efficiency have been greatly improved. Incandescent, halogen light efficiency is 12-24 lm/W, fluorescent light 50-70 lm/W, sodium 90 ~ 140 lm/W, most of the power loss into heat. Improved LED luminous efficiency will be to achieve up to 50 ~ 200 lm/W, and the monochromatic light is good, narrow spectrum, can be directly visible without the issue of color filters. At present, all countries in the world are stepping up to improve efficiency of LED light, in the near future, its luminous efficiency improvement will be greater.
2, LED light source power consumption less
The consumption of single LED is 0.03-0.06W, use DC-driven, single LED drive voltage is 1.5-3.5 V, current is 15 to 18 milliamperes. With high reaction speed, can be operated at high frequency. Under the same lighting effects, the power consumption of LED is one-eighth of incandescent bulbs, half of fluorescent tubes, the Japanese expert estimates, if the use of LED lighting to replace half ofthe incandescent and fluorescent light in Japan, It will save 6000 million liters crude oil annually. To the bridge lights as an example, one 40W fluorescent lamp can be replaced by one LED light with only 8 watts, and also the LED lights can change color.
3, LED light source with long life span
If use electronic radiation emitting light, light emitting filament burnability easily, heat deposition, with shortcomings of optical attenuation. But use of LED lights are small, light weight, epoxy package and can withstand high-intensity mechanical shock and vibration, hard broken. The average life expectancy of up to 100,000 hours. Life of LED lamp up to 5-10 years, the lamp can be significantly reduced maintenance costs.
4, LED light source safety and reliability
Low heat, non-thermal radiation, cold light source, can be touched safely: can accurately control light pattern and the light angle. Light color and soft, non-glare; not mercury, sodium and other elements may be hazardous to health. With built-in micro-processing system can control the luminous intensity, adjusting the light-emitting modes to achieve light with art.
5, LED light source is beneficial to the environment
LED luminous body is solid, quake resistance, impact resistance so that not easy broken, recyclable and no pollution. Small light source, can be easily produced into smart and portable lighting products, and also easy to install and maintain.
Of course, the energy-efficient is the main reason for us to consider the LED as light source, may be LED is more expensive than traditional light sources, but within one year it can recover the investment of replace new light source, more result 4 to 9 years for energy saving.
For more LED lightng info, please visit:
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I study a western version of JJ as well, Shorinji Kan Jiu Jitsu, as part of The Jitsu Foundation.
We generally have quite an open approach. We learn some strikes, most concentrating on vulnerable parts of the body that can be attacked to help other techniques. We also do throws, wrist locks and arm locks quite evenly as well a decent portion of groundwork, like i say all rounded.
We don't really do sparing, but we do do some more realistic approaches to applying techniques, known as V's or squares, in which you are attacked randomly with force and you have to apply a technique sometimes as a single attacker sometimes as multiple , we also do judo style sparring of just standing, just groundwork or both.
There are 2 events through the year. The atemi nationals, which is the use of V's, squares and gauntlets to demonstrate techniques, and the Randori nationals, which is judo rules. There are ground fighting competitions, standing throwing competitions and open compitions which involve both.