Xiao Huang wants to design a circuit to adjust the brightness of a small light bulb with the equipment shown in figure (a). Requirements: (1) When the slider of the sliding rheostat slides to the right, (1) The power supply consists of two 1.5V dry cells. If the voltage is 3V, the voltmeter has a range of 0 ~ 3V and is connected in parallel with the bulb.

The ammeter is connected in series in the circuit, and the lower left terminal of the sliding rheostat and any upper terminal are connected in series in the circuit, as shown in the following figure:

(2) The voltmeter has a measuring range of 0 ~ 3V, and the partial voltage is 0. 1V, indicating 2.4V 。

So the answer is: the connection of the physical circuit diagram is as shown in the above figure; 2.4.