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As shown in the figure, the power supply voltage remains unchanged, R1 = R2 = R3 = 3 Ω, when the switch S1 is closed, S2 is open, and the indication of the ammeter is 2A (1) When S1 and S2 are both disconnected, the current through each resistor and the power consumed by R1; (2) When S1 and S2 are closed, the total resistance of the circuit and the heat generated by R3 in one minute
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