Using DC the problem can be electrolytic action in the material being tested that causes the reading to change with time. AC prevents that happening.
Rectifier is used to convert alternating current to direct current.
bride transformer
Direct current and Alternating both are diffrent . Alternating current changes it's cycle 50 times in both direction in one second while the direct current doesn't change it's phase or frequecncy because it is free from frequency or frequency less(direct current).
In an alternating current circuit the voltage can be stepped up ordown efficiently with a transformer.
A couple primary reasons. 1 the current reversing itself helps to break up oxides on the surface of the metal. 2 Alternating current produces more heat in the arc which is useful in welding aluminum because heat dissipation is rapid in this metal.
Alternating current. Direct current is used in batteries.
The current produced by batteries is direct current. Electronic devices need direct current; in this case, they need a power supply (often built into the electronic device itself), that converts the alternating current, from the electric outlet, to direct current.
Alternating current (AC) is a type of electric current that changes direction periodically. It is commonly used in household electricity systems because it allows for easy voltage transformation and long-distance transmission.
Alternating
An inverter
Three-phase 408V systems typically use alternating current (AC).
Alternating electrical current is usually used in household.
Rectifier is used to convert alternating current to direct current.
Alternating current (AC) in almost all cases.
Alternating current
A.C. stands for alternating current. Likewise D.C. stands for direct current.
A device called an inverter is used to convert direct current (DC) to alternating current (AC). The inverter switches the direction of the current flow at a rapid rate, creating an alternating current output from the direct current input.