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由于滑动变阻器的存在,使电路内容变得丰富多彩,变化多端.下面就两道例题加以浅析,从而加深对此类题型的理解,学会归纳总结。例1如图1所示,R2是0-50Ω的变阻器,合上开关S后,V表读数为18V,A表的读数为0.5A,V1表的读数为5.0V,求:(1)R1和变阻器R2接入电路部分的电阻.(2)如果A表的量程是0-0.6A,V1的量程是0-15V,为了使电表不致被损坏,滑动变阻器可接入电路的阻值范围是多少?
Due to the existence of the sliding rheostat, the content of the circuit becomes rich and colorful, and changes are numerous. The following two examples are analyzed to deepen the understanding of such questions and learn to sum up. Example 1 As shown in Figure 1, R2 is a 0-50Ω varistor. After the switch S is closed, the V reading is 18V, the reading of the A meter is 0.5A, and the reading of the V1 meter is 5.0V. Find: (1) R1 And resistor R2 access circuit part of the resistance. (2) if the table A range is 0-0.6A, V1 range is 0-15V, in order to make the meter will not be damaged, the sliding rheostat can access the circuit resistance range is How many?