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如图 R_2是0～20欧的滑动变阻器,合上开关后电压表示数为6伏,电流表 A_1示数为0.5安,求:①R_1的阻值;②如果 A_1的量程是0～0.6安,A_2的量程是0～3安,为保护电表不被
Figure R_2 is a sliding rheostat of 0 to 20 ohms. After closing the switch, the number of voltages is 6 volts. The current meter A_1 shows 0.5 amps. Find the resistance of 1 R_1. 2 If A_1 has a range of 0 to 0.6 ampere, A_2 The range is 0 to 3 amps to protect the meter from being