For the circuit shown in the figure, the power supply voltage remains unchanged, R2 = 60 Ω. When the switch S is off, the indication of the ammeter is 0.5A; when the switch is closed, the indication of the ammeter is 0.6A. Calculate the resistance of R1

For the circuit shown in the figure, the power supply voltage remains unchanged, R2 = 60 Ω. When the switch S is off, the indication of the ammeter is 0.5A; when the switch is closed, the indication of the ammeter is 0.6A. Calculate the resistance of R1

It can be seen from the circuit diagram that when the switch S is disconnected, the circuit is a simple circuit of R1, and the ammeter measures the current in the circuit; when the switch is closed, two resistors are connected in parallel, and the ammeter measures the main circuit current; ∵ the parallel circuit works independently and does not affect each other, ∵ the current through R1 before and after the switch is closed remains unchanged, that is, I1 = 0.5A, ∵ in the parallel circuit

As shown in figure 23-13, when the switch is off, the indication of the ammeter is 0.3A, when the switch is closed, the indication of the ammeter is 0.5A, R1 = 6 ohm, calculate R2
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