VDC vs. VAC: Types Of Electric Current 

VDC vs. VAC: Types Of Electric Current 

Are you aware of the direction in which the Current is flowing? There are two ways electricity moves; Volts Direct Current (VDC) and Volts Alternating Current (VAC). As an electrician, you must know about VDC vs. VAC. 

Electricity always flows in a particular direction in a VDC system, similar to how a river runs. As an illustration, consider the flow of electricity produced by batteries, solar cells, etc. VAC is a technique where the positive and negative sides rotate regularly and the flow of current changes as a result. 

This is the electricity that comes from a generator or a plug-in. Additionally, alternating current is used to carry electricity produced by power plants and delivered to homes.

In this article, you will know what VDC and VAC are, the difference between VDC and DC, and a complete comparison of VDC vs. VAC. Read on!

What are VDC and VAC?

VDC vs. VAC: Types Of Electric Current 

In comparison to VDC vs. VAC, volts of direct Current (VDC), also referred to as volts of direct current, can be produced by a battery or a power source that transforms alternating Current (AC) into direct Current (DC). 

The voltage level is constant, and the waves only go in one direction from the wires. DC voltage generation is a relatively easy and straightforward process. A rotating coil produces a voltage in a magnetic field.

The splitter ring and commutator that make up the coil transform alternating electricity into direct voltage. DC’s steadiness is undoubtedly one of its most significant benefits. Much electrical equipment uses DC.

Positive and negative terminals regularly alternate using this technique known as voltage alternating Current (VAC). The current flow changes as a result. Alternating Current is induced in the coil when the conductor that is carrying the current spins in the magnetic field.

The magnetic flux is reduced as the conductor rotates, and the fluctuating flux results in alternating voltage in the conductor. VAC is the voltage applied by a generator or plug-in. Additionally, it serves as an alternating current to distribute electricity produced by power plants to residences.

Is there a Difference between VDC and DC?

VDC vs. VAC: Types Of Electric Current 

The simple answer is yes. 

Direct current = DC 

Volts Direct Current = VDC

The movement of electrons is referred to as direct Current or DC. Direct current is also known as DC, and VDC stands for volts, Direct Current. VDC is the term for the voltage in a DC circuit. Electrons travel in a DC circuit from the negative terminal to the positive terminal. Here, the path is never altered.

For instance, in the sentence 40 Amp AC/DC, you should understand that the number 40 represents the measurement of Current in AC or DC amperes.

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VDC vs. VAC 

VDC vs. VAC 
  • The voltage that generates direct current is referred to as VDC, whereas the voltage that produces alternating current is referred to as VAC.
  • While VDC moves in both directions, VAC only moves in one direction.
  • The generator produces VAC, and VDC is derived from the battery.
  • While the polarity of VAC never changes over time, VDC is always consistent.
  • While VDC voltage frequency is zero, VAC frequency varies by nation; primarily, 50 and 60 Hz are utilized.
  • While the power factor for VAC might range from 0 to 1, it is always 1 for VDC.
  • While VDC does not require phase or neutral, VAC has both.
  • While VDC transmission does not require the transformer, VAC transmission must.
  • While VDC lacks amplitude, VAC does. The most immense distance traveled by an oscillating or vibrating body is referred to as its amplitude.
  • When compared to VDC, VAC has a higher efficiency.
  • For VAC, impedance is the neutral characteristic, whereas, for VDC, it is resistance. Impedance is the term for a voltage’s opposition to the current flow.
  • Signal amplification is the process of making the signal stronger. The primary benefit of VAC is that it is simple to assess. The ability to readily amplify voltage is a benefit of VDC.
Comparative FrameworkVDCVAC
DefinitionVDC helps to generate direct current between the two terminals.VAC helps to generate alternating current between two terminals.
FrequencyZeroDepend on nation
Power Factor ZeroBetween 0 – 1
DirectionStay the sameVary
Generate FromBatteryGenerator
AmplitudeDon’t haveHave
AdvantagesSimple to enhanceSimple to measure
RNelson Multimeter VAC & VDC Settings

How To Calculate VDC From VAC?

To determine VDC using VAC, you can use the formula below.



From the AC voltage, we may derive VDC, the DC voltage.

VAC means full alternating current voltage.

By multiplying VAC by.636, you may determine VDC using VAC.


First, determine the total AC voltage.

In this example, the total AC voltage is measured as 120.

Finally, calculate VDC from AC voltage using the formula above:


Adding the above values to the equation results in the following:

VDC= 120∗.636 = 76.32

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Are DC and VDC the same?

No, volts of direct Current (VDC) are electrical units produced by batteries or electrical sources that change alternating Current (AC) into DC. Direct Current, or DC, is the term used to describe the flow of electrons.
A DC circuit’s voltage is known as VDC. In a DC circuit, electrons move from the negative to the positive terminal. The road never changes in this place.

Are VAC and Voltage the same?

The direct current voltage is referred to as VDC. So, yes, it is voltage, but it is the only kind that does not switch between positive and negative states.

24 VDC to VAC

24VDC is converted to 24VAC via a cheap DC/AC power inverter that is lightweight and tiny. Enables the use of 24 VAC equipment in setups with 24 VDC. Solar or battery backup systems are compatible with the DC to AC inverter.

Can You Use a VAC switch for DC?

Not generally. Switches commonly come in AC, VDC, and current ratings. In general, AC ratings are more fantastic than DC ratings. Therefore, if a button doesn’t have a DC rating, it shouldn’t be utilized with DC.

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