Simplified circuit explanation of physical circuit diagram

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When we analyze the connection of the circuit, it is often for the use of electrical appliances. Other components such as switches, voltmeters, ammeters, etc., have a negative impact on our more complex circuits, if they can Some components are removed from the circuit diagram, and the original circuit diagram can be simplified to ensure that the components are removed without affecting the original connection of the appliance. To this end, we can completely simplify the characteristics of the components removed, by:

1. If the switch is closed, draw a wire connection at the original switch. If the switch is open, remove the line completely.

2. The voltmeter has a large resistance due to the voltmeter, so the voltmeter can be regarded as an open circuit, and only the voltmeter must be removed.

3. The current meter has a small resistance due to the ammeter, so the current meter can be regarded as a short circuit, and the current meter should be connected with a wire.

The connection diagram of the electric appliance shown by the simplified diagram obtained by the above method is the connection condition of the electric appliance in the original circuit. This step is best on the draft paper, after drawing the original circuit diagram with a pencil, start from the positive pole of the power supply, and add and delete one by one until the negative pole of the power supply. For example, we have to judge the connection of the resistors R, R and R when the switches S and S are disconnected in Figure 9. The simplified circuit diagrams of the switches, voltmeters and ammeters are shown in Figures 10, 11 and 12, respectively. Shown. We can see from Figure 12 that the resistors R and R are connected in series.