Is it the voltage that forms the current, right? What is the reason why voltage is the formation of

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The concept of comparative image is the most contrasted with the flow of water, because the current cannot be observed, it is more abstract, but the flow of water can be perceived. How does water form a flow? It has to flow from high to low, so it needs a water pressure to form a current.

In the same way, when the charges move in the same direction, an electric current is formed, and there must be a voltage to move the charge in the same direction. A power supply is a device that provides voltage, what is the electric potential? It is the level of water, and the potential difference is the voltage.

That is, the water level difference, the water must have the water level difference to flow, and the charge must have the potential difference to form the current. That's what it means.

The directional flow of the charge forms an electric current. The concept of image is an analogy with the flow of water. The electric potential is equivalent to the difference in water level.

No, the current requires not only voltage, but also a loop. And if the resistance is infinite, the current is also zero.

1. Formation of electric current: The "free charge" in the conductor moves in a directional direction to form an electric current.

2. Conditions for the formation of current: Two necessary conditions must be met for the formation of a continuous current:

1) The circuit is the path.

2) There is a power supply to provide voltage.

3. The current is similar to the flow of water: the water in the pond generally does not flow, and the water in the river is gushing endlessly, because the water level in the upstream of the river is higher than that in the downstream, and there is a difference in the water level, there will be "water pressure". Similarly, a power supply provides a voltage that creates a potential difference between the two ends of the power supply, creating a "voltage" that causes the free charge to move in a directional direction to form a current.

Fourth, the essence of voltage: the effective power supply can continuously gather positive charges at the positive electrode, and the negative electrode continues to gather negative charges, so that the potential difference between the two ends of the circuit connected to the power supply is formed, and the free charge moves directionally under the action of the electric field force to form a current.

Related information. Scientifically, the amount of electricity passing through any cross-section of a conductor per unit of time is called current intensity, referred to as current. Usually denoted by the letter i, it is in amps (Andre Marie Ampere).

From 1775 to 1836, he was a French physicist and chemist who made outstanding achievements in the research of electromagnetic effects and also contributed to mathematics and physics. The SI unit of electric current, the ampere, is named after its surname), abbreviated as "ampere", and the symbol "a", also refers to the directional movement of electric charges in a conductor.

Voltage is the cause of the formation of the current, i.e., the voltage is the necessary condition for the formation of the current. Therefore, if there is current passing through the circuit, it means that there must be voltage at both ends of the circuit.

1. Voltage, also known as potential difference or potential difference, is a physical quantity that measures the energy difference between a unit charge in an electrostatic field due to different electric potentials. Its magnitude is equal to the work done by a unit positive charge to move from point A to point B due to the action of an electric field force, and the direction of the voltage is specified as the direction from the high potential to the low potential. The SI unit system of voltage is volts (V, referred to as volts), and the commonly used units are millivolts (mV), microvolts (V), kilovolts (kv), etc.

This concept is similar to the "water pressure" caused by the high and low water level. It should be pointed out that the term "voltage" is generally only used in electrical circuits, while "potential difference" and "potential difference" are generally applied to all electrical phenomena.

2. Current: Scientifically, the amount of electricity passing through any cross-section of the conductor per unit time is called current intensity, referred to as current. Usually denoted by the letter i, it is in ampère (André Marie Ampère, 1775-1836, French physicist and chemist, who made outstanding achievements in the study of electromagnetic effects and also contributed to mathematics and physics.

The SI unit of electric current, the ampere, is named after its surname), abbreviated as "ampere", and the symbol "a", also refers to the directional movement of electric charges in a conductor.

When the resistance is constant, according to r=u i, the voltage u is proportional to the current i. When the resistance is constant, the higher the voltage, the greater the current, the lower the electric voltage, the smaller the current, that is, the voltage and the current are proportional to the relationship. The current is generated by the voltage, so there must be a voltage if there is an electric current.

Conversely, there is voltage and there is not necessarily current current.

The determinant formula of the current is i=u r, and the current is determined by the voltage and resistance of the Sippel roll. The higher the voltage, the greater the current, and the greater the resistance, the smaller the current. Because the voltage exists, but the resistance is too large (the positive and negative electrodes are connected to a section of air, and the resistance is large), the current generated is considered to be negligible.

As for the absence of voltage, it is fine if the object is not charged. But there must be no current.

The magnitude of the current is described by the strength of the current, and the current intensity is the amount of electricity that passes through any section of the conductor within a certain period of time, referred to as the current, which is represented by i. The SI unit of voltage is volts (volts), but common units include millivolts (mV), microvolts (V) and kilovolts (kV).

There are two main types of current, which are alternating current and direct current. The size and direction of alternating current change periodically, for example, the common plug-in wall appliances in life use this type of alternating current. The direction of direct current does not change depending on the length of time.