Why 70W tungsten bulb is lighter than 100W
The light bulb is tungsten wire is more and more brighter, the more bulky tungsten wire, the smaller the smaller the resistance, the greater the current, the greater the power
Through the bulb of the current is relatively small, so the high-power light bulbs but not bright up.
The brighter the brightness, but you can feel the opposite, indicating that the power capacity is not enough, the current caused a large power supply voltage drop
