在如图所示的电路中,R1、R2和R3皆为定值电阻,电源的电动势为E,内阻为r.设理想电流表A的读数为I,理想电压表 V的读数为U.当R1发生断路时( )A.I变大,U变小,R3的功率不变B.I变大,U变大,R3的功
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![在如图所示的电路中,R1、R2和R3皆为定值电阻,电源的电动势为E,内阻为r.设理想电流表A的读数为I,理想电压表 V的读数为U.当R1发生断路时( )A.I变大,U变小,R3的功率不变B.I变大,U变大,R3的功](/uploads/image/z/3227388-60-8.jpg?t=%E5%9C%A8%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%9A%84%E7%94%B5%E8%B7%AF%E4%B8%AD%2CR1%E3%80%81R2%E5%92%8CR3%E7%9A%86%E4%B8%BA%E5%AE%9A%E5%80%BC%E7%94%B5%E9%98%BB%2C%E7%94%B5%E6%BA%90%E7%9A%84%E7%94%B5%E5%8A%A8%E5%8A%BF%E4%B8%BAE%2C%E5%86%85%E9%98%BB%E4%B8%BAr.%E8%AE%BE%E7%90%86%E6%83%B3%E7%94%B5%E6%B5%81%E8%A1%A8A%E7%9A%84%E8%AF%BB%E6%95%B0%E4%B8%BAI%2C%E7%90%86%E6%83%B3%E7%94%B5%E5%8E%8B%E8%A1%A8+V%E7%9A%84%E8%AF%BB%E6%95%B0%E4%B8%BAU.%E5%BD%93R1%E5%8F%91%E7%94%9F%E6%96%AD%E8%B7%AF%E6%97%B6%28%E3%80%80%E3%80%80%29A%EF%BC%8EI%E5%8F%98%E5%A4%A7%2CU%E5%8F%98%E5%B0%8F%2CR3%E7%9A%84%E5%8A%9F%E7%8E%87%E4%B8%8D%E5%8F%98B%EF%BC%8EI%E5%8F%98%E5%A4%A7%2CU%E5%8F%98%E5%A4%A7%2CR3%E7%9A%84%E5%8A%9F)
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