On the roof of your house, a 100 Watire hangs. Suddenly it was ruined. Now there are two in the house, two in 50 Wat. You might think, 50 and 50 are 100. Then you'll have a light as usual. It's not that simple. Two U.S. Wat are equal in one 100 Wat. In both cases, the total cost of 100 subway. But it's not the same to light. Pu

Advertisement