In this article ,we are here with the difference between the technological terms .Ac and Dc are the two common terms related to flow of electric charge, Ac stands for alternating current and Dc stands for direct current. This article covers up tutorial guide to AC and DC .With this, it also includes the differences between AC and DC.


AC vs DC

If we go through any electrical related topics most important thing which comes in mind is Electric current.

An Electric current or signal is a flow of charge.

The SI unit for measuring using a device called Ampere.

  • Electric current is measured using a device called Ammeter



I = Q/T

I  – Rate of flow of Electric current

Q –   Amount of charge

T – time

So, current is the rate of flow of charge, in other words it’s the amount of charge flow every second. It’s the simplest formula which represents the current flow in the wire across a cross-section.

  • Electric current that will flow through current isohms law


Current is the amount of flow of charge, it can also be represent in the terms of voltage and resistant. Where current(“I”) is inversely proportional to voltage(“V”) ,when the proportionality sign is replaced with “equal-to“ sign then a constant term comes into picture ,that constant term represents the resistance in  the  Circuit.

I = V/R

Ohm’s Law


                  V = potential difference

I = current

       R = Resistance


Current are generally 2 types

1) AC – Alternating Current

2) DC – Direct Current


1. AC (alternating current)


Definition of A/C(alternating current)

Alternating current (A/C) is the electric charge which periodically changes direction(50 hz :- means the electric current changes its  direction 50 times in a second) .In case of alternating current the  electric current(ampere) can increase or decrease under the same voltage limit.

The AC current when plotted on  a graph , is similar to sinusoidal form( it has three forms  square wave , triangular wave, sine wave). Ac current can be converted into DC current with the help of rectification circuit(p-n junction diode).Voltage of DC current after conversion from AC current is equal to Vrms , were rms = Vmax / √2.(Vmax is the maximum voltage in case of AC current and Vrms is root mean square of fluctuating AC voltage)

Waves Forms

  1. Sin wave
    sine wave
  • Square wave

 square wave


  • Traingular wave


2.DC (Direct current)


2.D/C (Direct current)

Direct current (D/C) is an Electric current which is unidirectional flow of electric charge (i.e voltage from negative to positive).It has fixed voltage value. It is the maximum voltage in a closed circuit, which is generally the voltage difference between the two poles of the battery.

Dc current works best in the range of ( 3 volts to 5 volts).It gives  power in the range of(5 to 10 watts). Direct current can be obtained from obtained from solar panels , batteries, thermocouples . Direct current can be converted into AC with the help of inverter circuit.


Types of Direct Current Waveforms

dc rectifier


ac dc 

Fig. Electric current

The major differences between AC & DC current

Define The current flowing in Alternating or Sinusoidal form is called AC. The current flowing through in Direct or pulses form called Direct Current
Frequency The frequency of AC varies 50-60hz depend upon the country The frequency of DC is 0.
Direction 1.The Direction of AC is reverse


2.constantly changes (positive to negative)

1.The DC flow in one direction


2.same direction (negative to positive)

Types of  Waves 1.      Sinusoidal

2.      Triangular

3.      Square

1.      Pulsating

2.      Pure

Obtained AC current obtains from main supply and is  generated from Invertors also DC current obtained from batteries
Storage &


AC can be converted into DC with the help of Rectification circuit and is easy to use for mobiles and laptops etc. DC can be converted in to AC with help of Inverter circuit and easy to use in homes and lights.
Examples Audio and Radio Mobile and laptops
Uses It is uses in fans ,Refrigerator, Split A.c It is uses to charge batteries and as power supply for Electronic systems.


Alternating current and Direct current are the two forms of current which are convertible from one form to another. Each of the two forms are different from one another  in  many ways. Every such parameter are discussed in the above section. But the major difference is that the direct current has unidirectional flow of electric charge while in alternating current the electric charge flows in both directions.



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