When did electricity first appear?

It was Faraday who discovered the electromagnetic reaction, namely: electricity generates magnetism, magnetism generates electricity 1831 was the year when Faraday made a major discovery. He discovered the phenomenon of electromagnetic induction, which laid the foundation for the development of the electric industry in the future.

At the same time, he also studied the chemistry of electric currents. In 1833, Faraday discovered two laws of electric current chemistry, which later took his name. In 1845, after recovering from his illness, he returned to his research work and discovered diamagnetism.

Electricity is a kind of energy body in nature, which exists objectively! It exists before human cognition. There are many people who have discovered its existence!

It's just that there is no one to generalize his nature and attributes! Its mystery has attracted many scholars to study it successively! There are also the experiments and discoveries of the ancestors of the above countries.

I don't think it's appropriate to be specific to a certain person! China began to use electricity in 1879.

Well, it should be in the Qing Dynasty, the first in the concession, and it is estimated that there is no grand occasion. In old China, the development of electric power was slow, and it was only limited to the cities, and there was basically no electricity in the countryside**, and the power generation at that time was also the independent of each city, and there was no national or regional large-scale power grid. It was only in New China that electricity entered the lives of the vast number of Chinese people and was truly popularized.

Alternating current, abbreviated as AC. The inventor was Nikola Tesla (1856-1943), the first alternator was invented by the French engineer Pixie (1832), and the earliest use of electricity in China was after the Opium War.

Faraday, China was in 1879 began to use electricity.

DC - Edison.

AC - Tesla.

Who invented electricity and how mankind went from the discovery of electricity to the use of electricity history.

1. Formation of electric current: the directional movement of electric charge forms electric current. (Any directional movement of the charge will form an electric current).

2. The direction of the current: the direction of the directional movement of the positive charge is defined as the direction of the current. (The direction of the directional movement of the negative charge and the direction of the movement of the positive charge are reversed, i.e., opposite to the direction of the current).

3. Power supply: a device that can provide continuous current (or voltage).

4. Power supply is the conversion of other forms of energy into electrical energy. For example, dry batteries convert chemical energy into electrical energy. Generators are converted from mechanical energy to electrical energy.

5. Conditions for continuous current: there must be a power supply and circuit closure.

6. Conductor: An object that is easy to conduct electricity is called a conductor. Such as: metal, human body, earth, acid, alkali, salt aqueous solution, etc.

7. Insulator: An object that is not easy to conduct electricity is called an insulator. Such as: rubber, glass, ceramic, plastic, oil, pure water, etc.

8. The main difference between conductor and insulator is that there are a large number of freely moving charges in the conductor, while there are almost no freely moving charges in the insulator, but there is no absolute boundary between the conductor and the insulator, and they can be converted into each other under certain conditions.

9. Metal conducts electricity by free electrons, and it moves in the opposite direction to the direction of the current in the metal conductor.

10. Circuit composition: It is composed of power supply, wire, switch and electrical appliances.

11. There are three states of circuits: (1) path: the circuit that is connected is called the path; (2) Open circuit: The disconnected circuit is called an open circuit; (3) Short circuit: The circuit that directly connects the wire to the two poles of the power supply is called a short circuit.

12. Circuit diagram: The diagram that uses symbols to represent the circuit connection is called the circuit diagram.

13. Series connection: connect the components in order one by one, which is called series connection. (If any part of the circuit is disconnected, no current will pass through the early circuit).

14. Parallel: connect the components in parallel, which is called parallel. (The branches in the parallel circuit do not affect each other).

15. The magnitude of the current is expressed by the current intensity (referred to as the current).

16. The unit of current i is the stalk: the SI unit is: ampere (a); Commonly used units are: milliampere (mA), microampere (a).

17. The instrument for measuring the current is: the ammeter, and its rules of use are: the ammeter should be connected in series in the circuit; The connection method of the binding post should be correct, so that the current enters from the + terminal post and comes out from the - binding post; The measured current should not exceed the range of the ammeter; It is absolutely forbidden to connect the ammeter to the poles of the power supply without passing through the electrical appliance.

Current (i), voltage (v), resistance (r) and power (p) are the basic concepts in electricity, and there are a series of relationships and calculation formulas between them.

1.Current (i): Current is the amount of charge passing through a conductor per unit of time and is measured in amperes (a).

2.Voltage (V): Voltage is the potential difference, which can also be understood as the energy enjoyed by the charge as it moves through the circuit, measured in volts (V).

3.Resistance (r): Resistance is the degree to which the flow of current is obstructed in a circuit and is measured in ohms ( ).

4.Power (P): Power is the conversion rate of electrical energy, that is, the energy consumed or produced in the mountains per hour, and the unit is watts (W).

The relationship between them can be calculated using the following formula:

Current vs. Voltage (Ohm's Law): U = i * R, where U is the voltage, I is the current, and R is the resistance.

Current vs. Resistance (Ohm's Law): i = u r, where i is the current, u is the voltage, and r is the resistance.

Voltage vs. Resistance (Ohm's Law): r = u i, where r is the electrical defense, u is the voltage, and i is the current.

Power and current, voltage relationship: p = i * v, where p is power, i is current, and v is voltage.

These relationships and formulas are very important in circuit analysis and design and can be used to calculate the interrelationships between voltage, current, resistance, and power. Depending on the situation, the above formulas can be used for calculations or other formulas can be used for derivation.