Question

что называют электрическим током?что характеризует эта величина

Answer 1

электрический ток-это упорядочное направленное движение заряженных частиц.

За направление тока условно принимают то направление, в котором должны были бы двигаться положительные заряды.

Если ток создается отрицательно заряженными частицами (например, электронами), то направление тока считают противоположным направлению движения частиц. Если напряжение на концах проводника с течением времени не меняется, то в проводнике устанавливается постоянный ток, а если меняется – то переменный.

Answer 2

What is Electric Current?

Electric current is the flow of electric charge. It is the rate of flow of electric charge past a point or region. In electric circuits, this charge is often carried by moving electrons in a wire. The standard unit of electric current is the ampere (A), which is defined as the flow of 1 coulomb of charge per second.

Characteristics of Electric Current

Electric current is characterized by several key aspects: - Direction: Electric current has a specific direction, which is the direction of the flow of positive charge. In most circuits, the direction of current flow is considered to be from the positive terminal of the voltage source to the negative terminal, even though the actual flow of electrons is in the opposite direction. - Magnitude: The magnitude of electric current is measured in amperes (A). It represents the rate of flow of electric charge and is a fundamental quantity in electric circuits. - Effects: Electric current can produce various effects, including heating (as in the case of resistive elements), magnetic fields (as in the case of coils), and chemical reactions (as in the case of electrochemical cells).

These characteristics define the nature and behavior of electric current in various electrical systems and devices.