After discussing the voltage relationship and current relationship between series circuit and parallel circuit, Xiao Min proposed the current relationship between parallel circuit and series circuit a

After discussing the voltage relationship and current relationship between series circuit and parallel circuit, Xiao Min proposed the current relationship between parallel circuit and series circuit as shown in Figure A. Solution: (1) Pay attention to the connection of voltmeter and ammeter when wiring.

The answer is: as shown in the figure.

(2) The content of the conjecture is that the total current is equal to the sum of the currents of each branch, so we should compare the indexes of A 1, A2 and A3.

So choose A 1, A2, A3.

(3) In this circuit, R 1 is connected in parallel with R2, and then connected in series with the sliding rheostat. V 1 measures the voltage across R 1 and R2, V2 measures the voltage across the sliding rheostat, and V3 measures the total voltage. According to the analysis, the total voltage in the circuit is equal to the sum of voltages at both ends of each part of the circuit.

So the answer is: the total voltage in the circuit is equal to the sum of the voltages at both ends of each part of the circuit.

(4) By analyzing the voltage values and corresponding current changes in 1, 2 and 3 experiments, it can be known that the current in the conductor is directly proportional to the voltage at its two ends.

So the answer is that the current in the conductor is proportional to the voltage across the conductor.