春晨电机引接线 YCB扁电缆 卷筒扁电缆

江苏春晨电缆有限公司生产电路及其参考方向春晨电机引接线 YCB扁电缆 卷筒扁电缆 Circuit and its reference direction 在电场力作用下，电荷的定向运动就形成电流。电流是一个代数量，它定义为在单位时间内通过导体横截面的电荷量。 Under the action of the electric field force, the directional movement of the charge forms the current. Current is an algebraic quantity, which is defined as the amount of charge passing through the cross section of conductor in unit time. 简单电路的简化：（左）原始电路、（右）简化电路 Simplification of simple circuit: (left) original circuit, (right) simplified circuit 简单电路的简化：（左）原始电路、（右）简化电路 Simplification of simple circuit: (left) original circuit, (right) simplified circuit 复杂电路模型 Complex circuit model 复杂电路模型 Complex circuit model 习惯上将正电荷的运动方向规定为电流的实际方向。而电流在电路中的一条支路**动时，会有两种可能的流动方向，如在右图中，acdb支路中的电流，可能从a点流到b点，也可能从b点流到a点。对于复杂电路在求解之前是不知道电流在支路上实际流向的，因此在计算复杂电路时，春晨电机引接线 YCB扁电缆 卷筒扁电缆应该先假定各条支路电流的流动方向，并用箭头表示，此假定方向称为电流的参考方向。参考方向是任意假定的，假定参考方向后就可以根据电路的定律求出各支路电流，若计算得到的电流为正值，则表明电流的实际方向与参考方向一致；若得到的电流为负值，则两者方向相反。 The moving direction of the positive charge is traditionally defined as the actual direction of the current. When the current flows on one branch of the circuit, there are two possible flow directions. For example, in the right figure, the current in the acdb branch may flow from point a to point B, or from point B to point a. Before solving the complex circuit, we do not know the actual flow direction of the current on the branch. Therefore, when calculating the complex circuit, we should first assume the flow direction of each branch current, which is represented by an arrow. This assumed direction is called the reference direction of the current. The reference direction is assumed arbitrarily. After assuming the reference direction, the current of each branch can be calculated according to the law of the circuit. If the calculated current is positive, it indicates that the actual direction of the current is the same as the reference direction; if the obtained current is negative, the two directions are opposite. 例如下图所示电路中，E1、E2数值用符号表示而不用具体数字表示时，电流的实际方向很难确定，但在计算之前不必考虑电流实际方向如何，只需假定电流的参考方向，例如选定图中从左到右的箭头方向，在此前提下进行计算，I=（E1-E2）/（R1+R2）得出电流值。若E1>E2，则I为正，表示实际电流流向与参考方向相同；若E1 E2, I is positive, indicating that the actual current flow direction is the same as the reference direction; if E1 < E2, I is negative, indicating that the actual current flow direction is opposite to the reference direction. According to this, we can judge the actual flow direction of the current. Note that after the reference direction is selected, the assumed reference direction cannot be changed on the circuit diagram in the whole calculation process
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