That means that some energy is wasted. For example, it is quite common for part of the input energy to be converted into useless heat.
A drastic example is a traditional incandescent light bulb. Something like 5% of the energy gets converted into visible light. The remainder is radiated mainly as infrared - that is, heat radiation.
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That simply means that some energy is lost, due to friction and other causes.
To find 10 percent less than 2500, you first calculate 10 percent of 2500 by multiplying 2500 by 0.10, which equals 250. Then, subtract 250 from 2500 to find the result. Therefore, 10 percent less than 2500 is 2250.
Any percent less than 100.
13 is 162.5 percent of 8 .
6.7 is more than 67 percent, as it is the same as 670 percent.