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例题.(2014年福建省高考题)图1为模拟远距离输电实验电路图,两理想变压器的匝数n_1=n_42R,忽略灯丝电阻随温度的变化.当A、B端接入低压交流电源时(A)A_1、A_2两表的示数相同.(B)L_1、L_2两灯泡的亮度相同.(C)R_1消耗的功率大于R_3消耗的功率.(D)R_2两端的电压小于R_4两端的电压.常见解析如下:假设升压变压器的变压比为n,则由于变压器
Example (Fujian Province Entrance Examination in 2014) Figure 1 shows the experimental circuit diagram of analog long-distance transmission. The number of turns of two ideal transformers is n_1 = n_4 2R, ignoring the filament resistance with temperature changes when A, B access low voltage AC power supply (A) A_1, A_2 have the same number of representations. (B) The luminances of the two bulbs L_1 and L_2 are the same. (C) The power consumed by R_1 is greater than the power consumed by R_3. (D) The voltage across R_2 is less than the voltage across R_4. Common analysis is as follows: Suppose the step-up transformer transformer ratio is n, then due to the transformer