江苏春晨电缆有限公司生产金南春晨 扁电缆YCB 卷筒扁电缆

在电路中，某点的电位是对电位参考点而言的，规定参考点的电位为零，并称为零电位点。电力电路中，常以大地为零电位点，用符号接地点零电位符号表示。例如电路为了安全而接地时，接地点就是零电位点。在图（直流电动势的表示方法）所示电路中，若设b点为零电位点，以Vb=0示之，则a点的电位为E，记作Va=E；反之，若设a点为零 电位点，Va=0，则b点电位Vb=-E。

In a circuit, the potential of a certain point is for the potential reference point, which is defined as zero potential point. In power circuits, the earth is often used as the zero potential point, which is represented by the sign of ground zero potential. For example, when a circuit is grounded for safety, the ground point is the zero point. In the circuit shown in figure (representation of DC electromotive force), if point B is set as zero potential point and VB = 0 is set, then the potential of point a is e, which is recorded as VA = E; otherwise, if point a is set as zero potential point and VA = 0, then the potential of point B is VB = - E.

在研究电子电路时，电位的概念用得很多，金南春晨 扁电缆YCB 卷筒扁电缆譬如二极管只有当阳极电位高于阴极电位时，二极管才导通；反之则截电子电路、电子设备一般都有公共的接壳点，该点亦称零电位点，但不一定是大地，用符号“丄”表示。通常就选该点作为电位参考点，即电子电路中接壳点的电位为零。

In the study of electronic circuits, the concept of potential is used a lot, for example, the diode can only be turned on when the anode potential is higher than the cathode potential; on the contrary, the electronic circuit and electronic equipment generally have a common shell point, which is also called zero potential point, but not necessarily a large ground, represented by the symbol "I". This point is usually chosen as the potential reference point, that is, the potential of the shell point in the electronic circuit is zero.

电压：电路中两点之间的电压表示单位正电荷从一点移到另点电场力所做的功，即：

Voltage: the voltage between two points in the circuit represents the work done by the electric field force of unit positive charge moving from one point to another, namely:

电压计算公式

Voltage calculation formula

Q——电荷量，单位C；

Q -- charge quantity, unit: C;

W——电场力移动电荷Q所做的功，单位J；

W -- work done by electric field force moving charge Q, unit J;

U——电压，单位V；

U -- voltage, unit V;

如果电压随着时间变化，则：

If the voltage changes over time: