江苏春晨电缆有限公司生产，当负载电压不超过一个电压源的电动势，而负载电流超过了电压源的额定电流时，应当采用并联电压源。
When the load voltage does not exceed the EMF of a voltage source, and the load current exceeds the rated current of the voltage source, a parallel voltage source should be used.
电压源的并联条件是：各个电压源的电动势必须相等，他们的内阻也必须相等，否则在电压源内形成很大的环流而烧毁电压源。m个电动势相等、内阻相等的电压源并立案后，其总电动势为：
The parallel condition of voltage source is that the electromotive force of each voltage source must be equal, and their internal resistance must also be equal. Otherwise, a large circulation will be formed in the voltage source and the voltage source will be burned. After the M electric potential is equal and the internal resistance is equal, the total EMF of the voltage source is as follows磁通量定义、公式、单位
Magnetic flux definition, formula, unit
磁通量定义：在均匀磁场中，磁感应强度B和垂直于磁场方向的某一面积S的乘积，称为通过这个面积的磁通量，用符号“Φ”表示。
The definition of magnetic flux: in the uniform magnetic field, the product of magnetic induction intensity B and the area S perpendicular to the direction of the magnetic field are called the "symbol" of the magnetic flux through this area.
因此可得知磁通量计算公式为：
Therefore, the formula for calculating magnetic flux is as follows:
磁通量计算公式
Calculation formula of magnetic flux
上述公式中所代表的的具体含义分别是：
The specific meanings represented in the above formula are as follows:
B：表示磁感应强度，单位（T）
B: magnetic induction intensity, unit (T)
S：表示与磁力线方向垂直的面积，单位（m2）
S: represents the area perpendicular to the direction of the magnetic line of force, unit (M2)
Φ：表示穿过S面积的磁通，单位（Wb）
The magnetic flux passing through the area of the S, unit (Wb)
磁通量单位：磁通量标示符Φ的国际单位制单位是韦伯，常以符号Wb表示。在电力工程计算中，也常采用麦克斯韦作单位，简称“麦”，韦伯和麦克斯韦之间的换算关系为：JEH电机引接线电压源的并联及电压和电阻的大小
A unit of magnetic flux: the international unit of unit of magnetic flux indicator is Webb, often expressed as a symbol Wb. In power engineering calculation, Maxwell is often used as a unit, called "wheat", and the conversion relation between Webb and Maxwell is as follows:
1 麦克斯韦（Mx）= 1 高斯(Gs)×厘米2 = 10-8韦伯(Wb)
1 Maxwell (Mx) = 1 Gauss (Gs) x cm 2 = 10-8 Webb (Wb)
磁通密度
Magnetic flux densityJEH电机引接线电压源的并联及电压和电阻的大小
如果吧磁感应强度B的大小和磁通量Φ与磁力线抽象的联系起来，则可认为磁通Φ在数值上就等于垂直通过该单位截面的磁力线条数。由磁通量计算公式Φ=BS得：
If the magnitude of magnetic flux density B and magnetic flux density are related to the abstraction of magnetic force line, it can be considered that magnetic flux is numerically equal to the number of magnetic lines perpendicular to the unit section. The formula for calculation of magnetic flux is =BS:
磁通密度
Magnetic flux density
这样，磁感应强度B的大小就等于通过单位面积上的磁力线条数。因此，磁感应强度大小又称为磁通密度。由此得出一个结论：磁通密度是磁感应强度的一个别名，它表示垂直穿过单位面积的磁力线的多少。（注意笔者上面将Φ和B比作磁力线的描述中加粗的字体含义区别）
In this way, the size of the magnetic induction intensity B is equal to the number of magnetic lines on the unit area. As a result, magnetic flux density is also called magnetic flux density. Thus a conclusion is drawn that magnetic flux density is an alias of magnetic induction intensity, which indicates the number of magnetic lines perpendicular to the unit area. (note the difference between the meaning of a rough font in the description that the author compares the B to a magnetic line of force).JEH电机引接线电压源的并联及电压和电阻的大小
由此可知，B和Φ是从不同角度描述磁场性质的物理量。磁感应强度B是描述磁场中某点的磁场大小，而磁通量Φ是表示磁场中某一范围内的磁场总体情况的物理量。磁感应强度B是矢量（有大小和方向的量叫矢量），而Φ是标量（只有大小而无方向的量叫标量）。在分析电磁现象时，应视具体情况而选用合适的量。
It can be seen that B and phi are the physical quantities that describe the properties of the magnetic field from different angles. Magnetic induction intensity B is the size of a point in the magnetic field, and the magnetic flux is the physical amount of the general magnetic field in a certain range of magnetic field. The magnetic induction intensity B is a vector (the size and direction of the vector), and the diameter is a scalar (the size of only the size but no direction is called the scalar). In the analysis of the electromagnetic phenomenon, the appropriate quantity should be chosen according to the specific conditions.