An incandescent bulb, made of a wire filament encased in glass, emits only 5% of the energy it consumes as light; the rest is wasted as heat.
由灯丝封装在玻璃里而制成白炽灯，只有5%的能量被用于发光；其余都以热能被浪费掉了。
The light bulb that we have here is only a few watts.
我们这的电灯泡，只不过是几瓦。
REMEMBER the urban myth about the inventor who patented a light bulb that would last for ever, only to see the patent snapped up by a consortium of manufacturers who buried it for good?
大家是否还记得这样一个都市神话？一位发明者申请了永亮灯的专利，结果是专利被灯具制造商们联合买断，之后为了利益，制造商们把专利销毁了。
For lights that turn on and off frequently, or are only on for a few minutes a day (like a light in a closet), an incandescent bulb will suffice.
需要频繁开关或是一天只要开几分钟的地方（比如说壁橱灯），用白炽灯泡就足够了。
The Seaswarm robots operate on solar energy and require only 100 watts of power, or about that of a bright light bulb.
海群机器人使用太阳能，只需要10 0瓦功率就能驱动，相当于点亮一个灯泡。
But if we use only one cell, then I won't be able to light a small light bulb.
但如果我们只用一个电池，那我连一个小灯泡都点亮不了。
That only just predated the invention of the light bulb whose first stirrings began in the early 1800s and finally became a commercial product in the last 20 years of that century.
这只比灯泡的发明早一点，灯泡的逐渐使用始于19世纪早期，并最终在19世纪的最后二十年成为了一件商品。
The N200's light is only 13.5 lumens on the high setting (a 60-watt incandescent bulb is 850 lumens). That's very dim, but it's comparable to a kerosene lamp.
一盏N200灯光亮最高能达到13.5流明(一只普通的60 W白炽灯有850流明)，虽然有点暗，但跟煤油灯比起来还是绰绰有余的。
The most basic version: a room for $19 with no bed, toilet paper, towels, air-conditioning or "honor bar, " and only a single light bulb in the bathroom for safety.
最基本的版本：一个房间为19美元，没有床，卫生纸，毛巾，空调或“荣誉栏” ，只有在浴室的一个灯泡（为安全起见）。
The only light came from a single bulb hanging, amongst cobwebs, from the ceiling.
只有天花板上被蜘蛛网包着的那个灯泡发出来的仅有的微光。
Never assume electrical wiring is harmless. Check the source to insure it has been cut off, even if only changing a light bulb.
决不能认为电线没危险，要检查电源，确认停电。就是换个灯泡也要这样做。
Thomas Edison needed only one way to make a light bulb.
托马斯·爱迪生只需要用一种办法来制造灯泡。
Can you make a bulb light up only with a wire and a cell? Look at some pictures.
仅用一根导线和一节电池能让小灯泡亮起来吗？
Can you make a bulb light up only with a wire and a cell? Look at some pictures.
仅用一根导线和一节电池能让小灯泡亮起来吗？
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