Distinguish between DC and AC

As-Salaam-Alaikum, Welcome to my blog "World of Knowledge".Here we discuss 
the distinguish between DC and AC in this article .

We know that that the concept of DC and AC is the basic concept in the field of electrical engineering.So,we learn some basic  points redarging this topic.

Points to be discuss in this Article are given below :

• What is Direct Current (DC)?
• Uses of DC:
• Graphical Representation of DC:
• What is Alternating Current (AC)?
• Uses of AC:
• Graphical Representation of AC:
• Why AC is more beneficial than DC?
• Some important differences between DC and AC: 
• Impact of DC:
• NOTE:

What is Direct Current (DC)?

When the electric charge inside the conductor flows in one direction then such type of current is called direct current. DC is the unidirectional flow or movement of electric charge carriers which are usually electrons. The intensity of the current can vary with time, but the general direction of movement stays the same at all times. The term DC is used in reference to voltage whose polarity never reverses.

In direct current, the magnitude is always remain constant and frequency is zero. In a DC circuit, electrons arise from the negative and move towards the positive.

Uses of DC:

Used in following terms

• Electric vehicles
• Cell Phones
• Welding  
• Electronic equipment
• Flash lighting 
• Hybrid vehicles
• Electroplating 
• Electrolysis

Graphical Representation of DC:

What is Alternating Current (AC)?

The current which change its direction periodically or the current that changes its magnitude and polarity at regular intervals of time is called an alternating current.

The magnitude and polarity can change along with the time and the frequency is 50Hz to 60Hz depends on country. In AC, the free electrons moved in the forward as well as in the backwards direction and easily converted from higher to lower values with the help of transformer.

Uses of AC:

• It is mainly used in transmission and distribution.
•  Industries
•   Factories
•  For the household purposes

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Graphical Representation of AC:

Why AC is more beneficial than DC?

The AC is more beneficial than DC because it is easily transformed from higher voltage level to lower voltage level.

Some important differences between DC and AC: 

• The charges in the AC flow by rotating a magnetic field within a stationary coil while in DC the charges flow by keeping the constant magnetism along the wire.
•  The power factor of the AC lies between zero to one while the power factor of the DC always remains one.
• The AC is generated by the alternator while the DC is generated by the generator, battery and cells.
• The AC pass on over a long distance with some losses while the DC pass on over very long distances with negligible losses.
• Through rectifier, AC converted into DC and through inverter, DC converted into AC.

Impact of DC:

When human body is getting shocked, the DC current trouble the body continuously while AC enter and exit from the body at regular interval.

NOTE:

The DC is more dangerous than AC because in AC the magnitude of current become high and low at regular interval of time but in DC the magnitude remain same.

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