This sharing, the law of current in series and parallel circuits, the test point Xi + examples.
2.Communication and reflection
1) The recorded data should be true, and the experimental data should not be modified at will, and conclusions should be drawn within the allowable error range
2) During the same experiment, the brightness of each small bulb may be different, and even some small bulbs are not bright, but this does not mean that the current is not equal everywhere, because the specifications of each small bulb are different.
3.Precautions should be taken during the experimental operation
1) First of all, draw the circuit diagram, and connect the physical diagram according to the circuit diagram
2) In the process of connecting the physical drawing, the switch should belong to the disconnected position;
3) When connecting the ammeter, the current should flow in from the positive terminal post and flow out from the negative binding post
4) Select the range of the ammeter according to the estimated current size, if the size of the measured current cannot be estimated in advance, connect the circuit, check that it is correct, and use the method of trial touch to select the appropriate range;
5) The reading should be objective and accurate, the line of sight should be perpendicular to the dial, and it should be facing the scale mark, disconnect the switch after reading and recording, cut off the power supply, and tidy up the equipment.
[Example].As shown in the figure, there is an experimental circuit diagram of "** series circuit current characteristics".
1) In the experiment, the specifications of the two small bulbs should be (fill in "same" or "not the same"), and the switch should be in the state during the connection of the circuit.
2) As shown in the table, the ** and the recorded data designed by a student during the experiment: point out that in the data recorded by **, the obvious error value is , and the reasons for the error are: .
3) The obvious improprieties in the design of this experiment** are:
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