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**Law Of Resistance Ohm **And The **Electric circuit** When the current starts from the +**Ve Terminal** of the generator or cell and passes through the load and returns back to the same place by passing the –**Ve Terminal** is known as the **Electric Circuit **or it can be defined as the path around which the electric current moves. Four components are required for a circuit to complete. **Law Of Resistance OhmThe resistance of a conductor depends upon **the:

**Length**.**Area of Cross-Section.****Types of Material.**

1. **Source of supply i.e., battery, cell or generator. **

2. **Conducting medium i.e., wire. **

3. **Consuming Device i.e., lamps, motor, heater, etc. **

4. **Controlling Device i.e., switch.**

**Types Of Electric Circuit?**

**Open circuit.****Short circuit.****Closed Circuit.**

**What Is Open Circuit**?

**It is that Circuit in which the +Ve or -Ve wire or the load wire is broken, as a result, the current will not flow through the load. The circuit is then Called an Open Circuit.**

**What Is Short Circuit?**

When the +**Ve** and –**Ve wires are connected without any resistance or load, it is called a short circuit. In this case,** the fuse gets blown out,

**What Is Closed Circuit?**

The circuit in which the load starts working when there is the flow of current is **Called a Close Circuit.**

**What Is The Resistance?**

**Law of Resistance:-**

The Resistance of a Conductor depends upon the following factors :

**Length**: The resistance of a conductor is directly proportional to the length of the conductor, as the length increases the resistance also increases, I.E. =**[email protected]****Area of Cross-Section**: The resistance of a conductor is inversely proportional to its cross-sectional area. I.E.**[email protected]/2 ( a=2xr )****Types of Material**: The resistance of a conductor depends upon the material used in it. Since different materials have different resistances.**[email protected]**

**Temperature**: The Resistance of a conductor depends upon the temperature. The resistance of pure metal increase with a rise in temperature. While those of carbon, mica, electrolytes, etc. decreases. Mathematically the above factors can be explained as

**R = Resistance of the conductor.**

**p = Specific resistance. **

**L = Length of the conductor.**

**a = Area of cross-section in m2.**

**How To Ohm Out a Three Phase Motor?**

Utilizing **Ohm meter**: Disconnect all force from the machine. Check every one of the three wires independently T1,T2,T3 (each of the three stages) to the ground wire. Readings ought to be limitless **Law Of Resistance Ohm.**

On the off chance that it’s zero or peruses any coherence whatsoever, at that point, an issue exists with either the motor or link . On the off chance that it is go straightforwardly to the motor and disengage from link and check motor and the link independently.

Make certain to ensure leads on the two closures are not contacting anything including different leads. Mostly The Servo Motors Shorts can be perused with a Normal Type Of Quality Meter.

To **Ohm 3 Phase Motor Windings** Ensure you utilize quality meter going up to at any rate 10megohms. Utilizing **Megohm Meter**: Disconnect all force from the machine. Check every one of the three wires independently T1,T2,T3 (each of the three stages) to the ground wire. Readings are typically in a reach from 600-2000 Megohms **Law Of Resistance Ohm.**

**What should a 3 phase motor Ohm?**

Mostly shorts will be under 20 Megaohms. Be In mind so as not to contact the leads or the wires to anything when taking the perusing. It can give bogus and unrepeatable readings making you pursue your story. The above is the thing that I discovered to be the normal for 230 Volt Ac** Of 3 Phase Motors. **

A dependable guideline that I’ve run over in other reference materials is around 1000 ohms of opposition for every volt of approaching forces. Despite the fact that 230meg for a 230VAC circuit appears to be on the low side from my experience.

Just utilize this as a general guideline. Simply be careful that from 230meg to 600meg regularly shows some disintegration in the links or motor protection.

You Can Also Watch **3 Phase Motor Winding Video** On Our **Electrical Trendz** Channel.

### **Temperature Coefficient Of Copper?**

The **Change In Resistance Of a Conductor Due To a Rise Of Temperature By 1°C is known as its temperature coefficient**. It may be positive or negative. It is denoted by a (read alpha) and its unit is centigrade carbon has a negative value its resistance decreases when the temperature rises **Law Of Resistance Ohm.**

Some alloys E.G., manganin, have value for a so, the Resistance of manganin does not change with temperature. Let, there be a resistance that has got the following values :

**R = Resistance at 0°C.****R = Resistance at t°C.****t = Rise in temperature in °C****a = The temperature coefficient**.

**What Is The Formula Of Temperature Coefficient?**

Now, the **Temperature is Raised **from 0°C to t,°C the change in resistance is from R, to R4, 12 and Rt be hot Resistance at Temperature t2 ,°C.

**Temperature Coefficient** **Chart?**

No | Material | Temperature Coefficient at 20°C |
---|---|---|

1 | Copper | 39.3 |

2. | Aluminum | 40.3 |

3. | Brass | 20 |

4. | Iron | 65 |

5. | German Silver. | 38 |

6. | Tungsten | 47 |

7. | Nickel | 54 |

8. | Mercury | 8.9 |

9. | Carbon | -5.0 |

10. | Glass. | 10°C |

Find the specific resistance of the eureka wire of 8 meter length and 0.0015 meter diameter has 13 resistance.

**Given Length of wire*** ** i* = 8 meters Diameter of wire

**Diameter of wire d = 0.0015m **

**Resistance of wire R = 1.38 ohm **

**Specific Resistance P=?**

**What Is The Ohm Law?**

OHM’S LAW It is observed that if a certain amount of current flows in a circuit it flows due to certain E.M.F. (voltage) and that Current Is limited by the resistance of the circuit, therefore current depends upon electric pressure and resistance. **This fact about invented by George S. Ohm and now famous as Ohm’s Law.**

The Ohm’s Law states that in any electrical circuit the current is directly proportional to the applied voltage inversely proportional to the resistance in the circuit, provided the temperature does not change and the physical com . of the circuit remains the same.

**What Is Ohm’s Law Formula?**

Magic Triangle: Magic triangle is for remembering to bring **Ohm’s Law (Formula). **Whatever you want to find, Put your thumbnail in it and the other two will give the result.

**I = Current in ampere.**

**R = Resistance in ohm’s**

**V = Voltage applied.**

**What are the 3 forms of Ohm’s law?**

Calculate the value of current through a **Resistance of 25** **Ω** if it is connected across a **10 Volt Supply.**

**How To Connection Of Resistors In Series?**

A number of **Resistances In Series** may be connected in the following three ways :

**Series connection****Parallel connection****Combined or Mixed or series parallel connection.**

**Resistance Series Connection**:

If two or more **resistances are connected** in such a way that there is only one path for the current to flow, it is known as the **series connection**. If **three resistances are connected as per the diagram**, the one end of the first resistance is connected with the start of the second and end of the second with the start of the third resistance and so on, and connect the two outside free ends to a supply these connections are known as series connections.

**Characteriştics of Series Connection**

**The same current flows through all the resistances as there is only one path for the current to flow.****The total voltage required to send a current through them is equal to the sum of the voltage required to send it through each of the resistances separately.**

**What Is Resistors In Parallel Formula?**

When two or more than **Two Resistances are Connected **in such a way that all the starting ends are connected to one terminal and all the ending ends are connected together at another terminal and these two points are taken for supply as shown in the figure, these types of connections are known as **Resistors In Parallel Formula** And **Resistors Parallel Connections.**

**Resistors Parallel Calculator Formula?**

**The voltage across each resistance is the same.**

V = V, = V, = V2 ……. 2. The sum of the individual branch currents is equal to the total circuit current Law Of Resistance Ohm.

**How To Make Resistance Series and Parallel Connection?**

When three or more than **three Resistances** are joined in such a way that the circuit has the characteristics of both the** Series as well as the Parallel**. This type of connection is known as **Series-Parallel Connection.**

**USED**:-It is used in all types of house and factory wiring for connecting different loads, such as lamps, motors, heaters, etc. They are connected in parallel.

**What Is The Law Of Current?**

These laws are used in determining the equivalent resistance of a complex network and the current flowing in the various conductors. Kirchhoff, gave two general laws which are known after him.

**First Law or Current Law**: In any network, all the wires meeting at a point are zero. In other words, the sum of the currents flowing towards a point is equal to the sum of those flowing away from it. For example, let there be a number of conductors meeting at a junction.

**Conclusion.**

In This Article, I m Trying To Information About Types Of Electric Circuit?. Law Of Ohm, **Law Of Current**,**3 phase motor Ohm** and Resistance Value And** Law Of Resistance Ohm.**

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**What is voltage current resistance?**

In any network, all the wires meeting at a point are zero. In other words, the sum of the currents flowing towards a point is equal to the sum of those flowing away from it. For example, let there be a number of conductors meeting at a junction.

### What are the 3 forms of Ohm’s law?

**I = Current in ampere.**

**R = Resistance in ohm’s**

**V = Voltage applied.**

### What Is The Value Of Temperature Coefficient?

The temperature is raised from 0°C to t,°C the change in resistance is from R, to R4, 12 and Rt be hot Resistance at Temperature t2 ,°C.

### What is resistance explain?

The Resistance of a conductor depends upon the following factors :

Length: The resistance of a conductor is directly proportional to the length of the conductor, as the length increases the resistance also increases, I.E. = [email protected]

### How do you Ohm a 3 phase motor?

Mostly shorts will be under 20 Megaohms. Be In mind so as not to contact the leads or the wires to anything when taking the perusing. It can give bogus and unrepeatable readings making you pursue your story. The above is the thing that I discovered to be the normal for 230 Volt Ac Of 3 Phase Motors.

### How do you ohm out a 3 phase motor?

Utilizing Ohm meter: Disconnect all force from machine. Check every one of the three wires independently T1,T2,T3 (each of the three stages) to the ground wire. Readings ought to be limitless.

On the off chance that its zero or peruses any coherence whatsoever, at that point an issue exists with either the motor or link . On the off chance that it is go straightforwardly to the motor and disengage from link and check motor and the link independently.