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1问题的提出图1如图1所示,已知电源的电动势为E、内电阻为r,A、B两个定值电阻的阻值分别为R1和R2.今调节可变电阻C,使其获得不同的电功率,试确定使可变电阻C出现最大电功率时电阻值R,并导出其最大电功率的表达式.本题为一高考模拟试题,命题者的命题意图是考查电源的最大输出功
1 Problem Proposed Figure 1 As shown in Figure 1, the known power source has an electromotive force of E and an internal resistance of r. The resistance values of the two fixed value resistors of A and B are R1 and R2. Nowadays, the variable resistance C is adjusted. It obtains different electric power, tries to determine the resistance value R that makes the variable resistance C appear the maximum electric power, and derives the expression of its maximum electric power. This question is a college entrance examination simulation test question, the proposition intention of the proposition is to examine the maximum output power of the power supply.