First of all, you need to learn better English. You probably wouldn't like it very much if I posted an unintelligible question in your native language, would you?
OK, so you want to know why some devices are said to be more of a load than others, right?
The easiest case is pure resistance in a DC circuit. A resistor of lower value is said to be more of a load than one of higher value. (For example, a 10Ω resistor is twice as big a load as a 20Ω resistor, because it will cause twice the current to flow, given the same voltage.)
Things get more complicated in AC circuits with loads that are inductive (coils), capacitative or both. But basically it's the same as with DC circuits and resistors. Some combinations of L (inductance) and C (capacitance) have higher reactances than others. Think of reactance as "AC resistance". (It's actually not as simple as that, but it will suffice for this conversation.) Things with lower reactances look like bigger loads than those with higher reactances. (And of course, with AC, reactance depends on frequency as well as the L, C and R values.)
Does that help?