### Concept of AC and DC Current , Alternating , Direct , Example

In this article you will see about concept of AC ( Alternating Current ) and also concept of DC ( Direct Current ) Now days electricity is generated as AC (alternating current). The power generated is transmitted, distributed and mostly used as AC. In this article, the fundamental concepts of AC and AC circuits are discussed below.

### Introduction

We have determined that the electric current drawn from a battery is unidirectional.The polarity of the battery is marked + Ve and - Ve. When a particular load, called a lamp (denoted by its resistance) is connected to the two terminals of the battery, a current flows through the lamp in a particular direction.

#### constant or constant-value direct current

Along with the current, its direction also remains constant with respect to the time constant of the battery voltage. Such a current is known as a constant or constant-value direct current.

#### Definition of direct current

A direct current is a unidirectional flow electric charge. An electrical cell is a major example of DC power.

Direct current can flow
• Through a conductor as a wire .
• It can also flow through an electron .
• It flow through ion beam .
• through a semiconductor.
• It can also flow through insulator, or even vacuum as in electron or ion beams.
One question may comes in your mind that "Are batteries AC or DC?"

Answer of this question is battery is Direct Current (DC).By using dc to ac to dc converter which is known as inverter.

Q.Which is dangerous between AC and DC?
Answer : Alternating current is more dangerous than direct current .It is said that ac is four to five time even some cases 10 time more dangerous than dc

## Concept of AC and DC

When the direction of current is continuously changed through a circuit, such current is called (ac) alternating current.The polarity of the AC supply source changes alternately and alternately flows the current through the load associated with the terminals.

• #### Direct current of constant magnitude :In given figure below shows the nature of current. when the switch is 'ON' and 'OFF' at regular intervals.

Using the reverse switching arrangement, as shown in the diagram, we can flow an AC through the load.

Here, through a reverse switch, supply terminal 1 is connected to load terminal 2 to and supply terminal 2 is connected to load terminal 1 terminal.

It may be noted that if the period of the current in both directions is constant, the load current will be alternating in nature and its wave shape will be square or rectangular type as shown in the figure below.

#### Conclusion

I hope you like like this information about concept of AC and DC in details .If you have any question regarding this topic you can ask by commenting us .

### About N-Type and P-Type Semiconductor | Materials | Example |

Here you will know about  n type and p type semiconductor in details. You can already see about bonding in semiconductor . N type and P type semiconductor is used in electronic appliances.which is the basis of working of all the electronic devices.So lets discuss in this given topic in the details. N type and P Type Semiconductor When some impurities added to the pure semiconductor then it becomes extrinsic semiconductor and this process of adding impurities is known as doping.  Now it depends on the which type of impurities it added to the semiconductor (two types of impurities can be added to semiconductor pentavalent or trivalent). n-type semiconductor : If impurity that is added to the pure semiconductor is a pentavalent ( which has five valance electron ) then it is called n-type semi conductor. p-type semiconductor : If trivalent impurity is added to the semiconductor then it becomes p-type semi conductor. ( Note-List of  n type and p type semiconductor material is given below.

### Biasing of p–n Junction | Forward and Reverse-biased |

Biasing the p-n junction means applying some external voltage to both sides of the p-n junction. Reverse-biased junction and forward-biased junction are two types of biased junction. You should have also good understanding of  N-Type and P-Type Semiconductor before moving towards this topic. Biasing of p–n Junction  Biasing of a p–n junction  means uses of some external voltage across the two sides of the p–n junction. It is divided into two groups  Forward-biased junction :  When the p-side of junction  is connected to the positive terminal of a battery and the n-side of junction is connected to the negative terminal, the p–n junction is said to be a forward-biased junction.  Reverse-biased junction  :If the positive terminal of the battery is connected to the n-side of junction and the negative terminal on the p-side, the p–n junction is said to be a reverse-biased junction. Now we will see about forward and reverse-biased junction in detail.  Related Topic    Bonding in semiconduc

### Engineers Files Explained | Types of file

Today we will learn about engineers files explained, as we know hand tools are used to remove small amounts of material, usually from small areas of the workpiece.   Do you know why hand tools are used ?Hand tools are used because of following reason: If no machine is available,  The workpiece is too large to go on a machine  The shape is too intricate or simply that it would be too expensive to set up a machine to do the work. As you know the necessity of a hand tools now we will know about a hand tool , engineer's files. Engineer’s files Files are used to perform a variety of tasks, from simple removal of sharp edges to producing complex shapes where use of the device is impractical.Files can be obtained in a variety of shapes and in lengths from 150 mm to 350 mm. Single-cut file: When a file has a single series of teeth cut across its face it is called  single-cut file ,Figure of single-cut file is shown below. double-cut file: When a file has double series of teeth cut across