典型电路图的一图多用(国外英文资料).docVIP

典型电路图的一图多用(国外英文资料) A diagram of a typical circuit diagram is used in many ways This article source: paper / In the junior high school physics and electrical parts, as shown in Figure 1 using integrated circuit not only current meter, voltage meter and sliding rheostat, and it can be used to explore the relationship between electric current and resistance and voltammetry to measure resistance and voltammetric measurement of power and other important electrical experiment, the experiment content is senior high school entrance examination hot over the years, so Figure 1 is one of the most typical circuit diagram of the junior middle school physics, the analysis of the several important test of the circuit diagram. 1. explore the relationship between current and voltage and resistance The control variable method was adopted in this experiment. (1) explore the relationship between current and voltage This experiment should control the resistance unchanged, the object is to determine the value of this part of the circuit resistance, rather than the entire circuit, so the ammeter to determine the value of resistance in the current, voltmeter to determine the value of the voltage at both ends of the resistor. Due to the series everywhere is equal to the current in the circuit, so as long as the ammeter in series in the circuit, it can measure the resistance value of current and voltage meter should be in parallel with the fixed value resistor, the voltage can be measured at both ends of the fixed value resistance. By adjusting the sliding rheostat to the fixed value of voltage across the resistor changes exponentially, to obtain the data of current with voltage changes, the analysis of the experimental data can be concluded: resistance, voltage in a conductor with the ends of a conductor is proportional to the current. (2) investigate the relation between electric current and resistance This experiment should control the voltage constant, change with different resistance R