Current location - Training Enrollment Network - Mathematics courses - (20 10? Xiaole wants to measure the resistance of resistor RX with ammeter and resistor R0 with known resistance. Xiaole chose to meet the experimental requirements.
(20 10? Xiaole wants to measure the resistance of resistor RX with ammeter and resistor R0 with known resistance. Xiaole chose to meet the experimental requirements.
(1) switch S2 is connected in parallel with Rx, as shown in the figure:

(2) If the switches S 1 and S2 are closed at the same time, the circuit is a simple circuit of R0, and the current represents the digital I2, then the power supply of the power supply is U = I2R0.

If switch S 1 is closed, switch S2 is opened, the circuit is R0 and Rx in series, and the ammeter indicates I 1, then the total resistance in the circuit is R = UI1= I 20I1;

Therefore, Rx=I2R0I 1-R0=(I2? I 1)R0I 1。

So the answer is: (1) the connection is as shown in the above figure; ②(I2? I 1)R0I 1。