Why are some wires thicker and some thinner, and which appliances are they connected with 5

The ability of a wire to withstand current determines the diameter of the wire.

From a safety point of view, try to use a wire with a large cross-sectional area to reduce the heat caused by wire overcurrent.

From the perspective of cost, try to use cheap ordinary materials to reduce engineering costs.

From the installation point of view, it is made of soft materials as much as possible to facilitate handling, laying and connection.

Wait a minute. The wire is relatively thick, generally used in the power circuit, the line carrying large current, such as the home power line, air conditioning power line, etc.

The wire is relatively thin, and is generally used in communication and control loops to conduct effective signals, such as ** wires, broadband network cables, etc.

An experienced electrician can roughly judge the purpose of the wire from the appearance of the wire.

From the perspective of high and high school physics, u=IR, r is inversely proportional to the cross-sectional area of the wire, so the resistance of the thick wire is small, and the current carrying capacity of the thick wire is large under the same voltage.

From the above analysis, it can be seen that high-power electrical appliances require a large current (p=ui), so thick wires are required.

The answers under the foundation of high school physics, I don't know if it can help you o( o

The thickness of the wire corresponds to the size of the current, hopefully!

Coarse and air conditioner, thin and small fan.

The power is different, the current size is different, and the matching connection.

Because the coarse current is large, it is not easy to burn out.

Because the high power generates a large current and generates a large amount of heat, it is easy to burn off if the wire is thin.

The greater the power, the greater the current, the larger the current, the wire must have a certain current carrying capacity, and the two main factors that determine the current carrying capacity of the wire are: the material of the wire and the wire diameter. This has little to do with voltage, just like the car starter motor uses a voltage of 12V, but the wire is very thick, thicker than the wire on a 380V motor, this is because of the large flow current.

Power Voltage = Current, just remember this.

For wires of the same length, the resistance is inversely proportional to the cross-section, and the thicker the wire, the smaller the resistance.

The power of the wire heating is equal to the square of the current multiplied by the resistance, and the current of high-power electrical appliances is very large, and the resistance of the thick wire is small, so the heat generation is also small. The thin wire has a large resistance, so the heat is serious, which not only causes a waste of electric energy, but also causes insulation damage, leakage and even fire due to the heating of the wire.

Summary. Dear, hello, cables and wires are generally composed of three components: core, insulating skin and protective skin. The wire is composed of one or several soft wires, covered with a light and soft sheath; A cable consists of one or several insulated wires wrapped around a tough outer layer made of metal or rubber.

There is no strict boundary between the two. Generally, the products with a small number of cores, small product diameter and simple structure are called wires, those without insulation are called bare wires, and the others are called cables; The larger conductor cross-sectional area (more than 6 square millimeters) is called large wire, the smaller one (less than or equal to 6 square millimeters) is called small wire, and the insulated wire is also called cloth wire; Cables generally have more than 2 layers of insulation, and most of them are multi-core junctions.

Dear, hello, cables and wires are generally composed of three components: core, insulating skin and protective skin. The wire is composed of one or several soft wires, covered with a light and soft sheath; A cable consists of one or several insulated wires wrapped around a tough outer layer made of metal or rubber. There is no strict boundary between the two.

Generally, the products with a small number of cores, small product diameter and simple structure are called wires, those without insulation are called bare wires, and the others are called cables; The larger conductor cross-sectional area (more than 6 square millimeters) is called a large wire, and the smaller one (less than or equal to 6 square millimeters) is called a small wire. Cables generally have more than 2 layers of insulation, and most of them are multi-core slag junctions.

Dear, I hope you can be satisfied with my reply, and I look forward to your praise Thank you! Happy every day.

First of all, three concepts are clarified:

1. The wire is resistive, the thicker the wire, the smaller the resistance (r= l s) 2. Household appliances and wires are connected in series, and the voltage is divided in series.

3. When there are many household appliances, the current in the circuit is large.

So, household appliances are more than a time:

On the one hand, the more partial voltage δU=IR on the wire, the smaller the voltage on the appliance (usually the voltage from the substation is 240V, just to leave some margin for the loss on the wire). In order to ensure the normal operation of household appliances, it is necessary to reduce the partial voltage on the wire, the way is to reduce the resistance of the wire, and the most direct is to increase the cross-sectional area of the wire. (It is also possible to change the wire material to reduce the resistivity, such as replacing the wire with a copper core).

On the other hand, if the current is large, the power consumed on the wire will be greater p=i i r, and the result will be that the wire will heat up, cause the insulation layer to deteriorate, and even cause the wire to burn out. In order to reduce the power consumed on the wire, it is also required to reduce the resistance of the wire, and thickening is the most direct way.

Conductors with different cross-sectional areas have different safe current carrying capacity.

If the electrical appliance is more current, if the safety current value of the wire is exceeded, the copper wire will heat up, the outer insulation layer will be damaged and aged, the light one will reduce the service life of the wire, and the heavy wire will be short-circuited.

Therefore, only by thickening the wire and increasing the safe current carrying capacity that it can withstand can we ensure that the temperature rise of the wire does not exceed 40 degrees and can be used for the longest time. Refer to the specific numerical references.

For example, if you divert the water of the Yangtze River into your river, will the water overflow to the outside of the river, and if you widen the river of your family to the width of the Yangtze River, it will be fine, right?

Electricity is also like this, the thin line is like your river, the household appliance is the Yangtze River water, the household appliances use more electricity, you need to widen the river (thicken the wire). I don't know if I understand???

Please don't tell me that your river is the Yangtze River, hehehe.

The current carrying capacity of the wire is limited, the power of the electrical appliance is large, the current is large, when the bearing capacity of the wire is exceeded, it will heat up and then cause the wire to burn out, generally we are equipped with 1 square millimeter copper wire according to the load of 1000W, that is to say, when the total power of your home electrical appliances is 4 kilowatts, the cross-section of the wire entering the household should not be less than 4 square millimeters.

If the electricity consumption is large, the wire will heat up, and if the load is overloaded, the wire will be burned, and the thickening is to prevent it from being burned.

The flow of a small river shall not float a huge boat. The ocean can ruin thousands of miles.

Law of resistance: r= l s

– resistivity of the material from which the resistor is made, and the SI system is ohm-meter (·m); l - the length of the wire wound into a resistor, the SI system is meters (m); s - the cross-sectional area of the wire wound to the resistor, the SI system is square meters ( ) r - the resistance value, and the SI system is ohms ( ).

Material, wire of the same length, the thicker the resistance, the smaller the resistance. From Ohm's law When the voltage is constant, the greater the resistance, the smaller the current.

So, under certain conditions, the thicker the wire, the greater the current flowing.

In a series circuit, the current passed through wires of different thicknesses is the same.