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在电路问题中,有时涉及如图1所示的电路,R1、R2为固定电阻,R为滑动变阻器,P为变阻器的滑片,这种电路有如下的规律.两并联支路电阻之和R0为定值,电路的总电阻随两支路电阻相差的增大而减小,随两支路电阻相差的减小而增大;当两支路电阻相差最大时总电阻最小,相差最小时总电阻最大,且相差为0时,总电阻最大为R0/4.
In the circuit problem, sometimes involved in the circuit shown in Figure 1, R1, R2 for the fixed resistance, R for the sliding rheostat, P varistor vane, this circuit has the following rules. The sum of the resistance of two shunt branch R0 For the set value, the total resistance of the circuit decreases with the increase of the difference between the two branches of resistance and increases with the difference of the two branches of resistance. When the difference between the two branches of resistance is the smallest, the total resistance is the smallest. The maximum resistance, and a difference of 0, the total resistance of the maximum R0 / 4.