The 4-20mA current loop standard was designed for analog instrumentation signals due to its simplicity, noise immunity, and ability to send signals over long distances without significant signal loss. It also allows for easy detection of broken wiring or sensor failure since a zero reading or out-of-range measurement implies an issue in the circuit.
Two-way current is called alternating current (AC). In AC, the flow of electric charge periodically reverses direction, unlike direct current (DC) where the flow of electric charge remains in one direction.
Direct current (DC) refers to electric current where electrons always flow in the same direction in the wire. This is in contrast to alternating current (AC), where the flow of electrons periodically reverses direction. DC is commonly used in batteries and electronic devices that require steady and constant voltage.
The main division is between alternating current (AC) and direct current (DC). AC is universal now for domestic and industrial supply, but DC used to be used in some places in the early part of last century. Automobiles use DC at 12V which is I think universal now. AC in domestic use can be at 50Hz (Europe and many other places) or 60Hz (North America), and can be at either 240V or 120V.
DC stands for direct current in measurement units, typically used to describe the flow of electric charge in a circuit that maintains a constant direction.
Direct current (DC) flows in one direction and is commonly used in batteries and electronics. Alternating current (AC) changes direction periodically and is used in homes and most electrical grids for its ability to be easily transmitted over long distances.
DC current
dc
DC-Direct Current.
That's a "direct" current.
dc
Volts direct current eg battery As opossd to Vac wich is volts altinating current eg mains supply
DC aka direct current
This is known as DC. Direct Current.
If the question is about electric current, then types of currents are alternating current (AC) and direct current (DC).
DC or direct current
Direct current (DC) is nothing but an electric current flowing only in one direction.
The description AC/DC refers to equipment designed to be operate on either alternating current (AC) or direct current (DC). In alternating current the movement of electric charge periodically reverses direction. In direct current , the flow of electric charge is only in one direction.