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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I won't do it, or you don't have it~