The electric furnace wire is hot and red, but why is the copper wire connected to the electric furna

Because the copper wire and the electric furnace wire are connected in series, according to Q=I2RT, the current passing through is equal, but the resistance of the copper wire is much smaller than that of the electric furnace wire, so the electric furnace wire is hot and red, while the copper wire is not very hot.

Electric furnace wire mainly includes two categories: iron-chromium-aluminum alloy electric furnace wire and nickel-chromium alloy electric furnace wire. The former is an alloying material with ferrite structure, and the latter is an alloying material with austenitic structure. In addition, there are some special-purpose electric heating alloy wires such as tungsten wire, molybdenum wire, etc.

Electric furnace wire electric heating pipe.

1. The temperature of the softening point of quartz glass is about 1730, which can be used for a long time at 1100, and the maximum temperature of use in a short period of time can reach 1450, 2. In addition to hydrofluoric acid, quartz glass almost does not react with other acids, and its acid resistance is 30 times that of ceramics and 150 times that of stainless steel, especially in the chemical stability at high temperatures, which is incomparable to any other engineering materials.

3. The thermal expansion coefficient of quartz glass is very small, which can withstand drastic temperature changes, and the quartz glass will not burst when heated to about 1100, and it will not explode when placed in room temperature water.

4. Quartz glass has good light transmittance in the entire spectral band from ultraviolet to infrared, and the visible light transmittance is above 93, especially in the ultraviolet spectral region, the maximum transmittance can reach more than 80.

5. The resistance value of quartz glass is equivalent to 10,000 times that of ordinary glass, which is an excellent electrical insulating material and has good electrical properties even at high temperatures. Due to the above-mentioned excellent physical and chemical properties, quartz glass is widely used in various fields such as electric light source, semiconductor, optical communication, military industry, metallurgy, building materials, chemistry, machinery, electric power, environmental protection and so on.

Precautions. 1.When designing the electric furnace wire, the wire diameter should be correctly selected according to the power wiring method and reasonable surface load;

2.Before installation, the furnace wire should be fully inspected to remove the hidden dangers of ferrite, carbon formation, and contact with the electric furnace, and avoid short circuit to prevent the breakdown of the furnace wire;

3.The electric furnace wire should be correctly connected according to the designed wiring method during installation;

4.The sensitivity of the temperature control system should be checked before using the electric furnace wire to prevent the temperature from malfunctioning and causing the electric furnace wire to burn out.

The wire and the resistance wire are connected in series, so the current is equal, according to Q=ixixrxt, in the case of equal current and energizing time, the greater the resistance, the more heat is generated, because the resistance of the resistance wire is greater than the wire, the heat is much more than the wire, so: the electric furnace wire is hot and red, but the copper wire connected with the resistance wire is not very hot.

When the electric furnace is in use, the electric furnace wire and the copper wire are connected in series, I electric furnace wire = i wire, the energizing time t is the same, Q=I2RT, R electric furnace wire R wire, the heat generated by the current:

Q electric furnace wire Q wire, so that the electric furnace wire is hot and red, but the copper wire connected to the electric furnace wire is not very hot

Therefore, the resistance of the electric furnace wire is large, and the heat generated is more

Because the resistance of copper wires is small, the thermal conductivity is relatively poor.

Because copper has a relatively high melting point, it is not easy to heat.

This is because the resistance of the electric furnace wire is large, whereas the resistance of the copper wire is small.

The resistance of the copper wire is relatively small, the thermal conductivity is relatively poor, and the temperature rises quickly.

Copper has a high melting point and heats up more slowly. Unlike iron, it conducts heat quickly.

Because the resistance of copper wires is very small.

The wire and the resistance wire are connected in series, so the current is equal.

q=i2rt,relectric furnace wire rwire,heat generated by current:

Q electric furnace wire Q wire, so that the electric furnace wire is hot and red

According to Q=ixixRXT, when the current and energizing time are equal, the greater the resistance, the more heat is generated, and the resistance of the resistance wire is greater than that of the wire.

Answer: When the electric furnace is in use, the electric furnace wire and the wire are connected in series, and the current passing through them is equal, and the energizing time t is the same, because q=i2

RT, R electric furnace wire.

r wire. So the heat generated by the electric current: such as orange socks Q electric stove Wu penny.

Q wire. As a result, the electric furnace wire is hot and red, but the wire connected to the electroslag excitation wire is not very hot

Answer]: B copper wire and electric furnace wire are connected in series, so their current phase slips and closes, etc., so A is excluded. In addition, the resistance of the electric furnace wire is much greater than that of the copper wire.

According to Joule's law, when the current and electricity are hungry for the same time, the greater the resistance, the greater the amount of heat rot, so the electric furnace wire will be red, while the copper wire will not be too hot. So the answer is b.

The electric furnace wire is connected to the circuit through the wire, and the electric furnace wire and the wire pass through the same time and the resistance of the wire is very small, and the resistance of the electric furnace wire.

It is very large, so that when the current passing through it is equal, the electric furnace wire is hot and red, while the wire is barely hot

From Joule's law, we know that the heat generated by the current through the conductor is proportional to the square of the current, the size of the conductor resistance and the energizing time The electric furnace wire and the connected wire are connected in series in the circuit (the passing current is equal), the energizing time is the same, and the resistance of the electric furnace wire is greater than the resistance of the wire, according to the analysis of Joule's law

The wire and the resistance wire are connected in series, so the current is equal, according to Q=ixixrxt, in the case of equal current and energizing time, the greater the resistance, the more heat is generated, because the resistance of the resistance wire is greater than the wire, the heat is much more than the wire, so: the electric furnace wire is hot and red, but the copper wire connected with the resistance wire is not very hot.

Answer: Because the copper wire and the electric furnace wire are connected in series, according to Q=I2RT, the current passing through is equal, but the resistance of the copper wire is much smaller than that of the electric furnace wire, so the electric furnace wire is hot and red, while the copper wire is not very hot.

The series current is equal everywhere, and the resistance of the wire is much smaller than that of the electric furnace wire, according to Q=i Rt, it can be seen that the heat of the wire is much smaller than that of the electric furnace wire in the same time.

Because the thermal conductivity temperature of copper wires is very small.

Because the resistance of the copper wire is less than that of the electric furnace wire.

Because the electric furnace was designed with this situation in mind, they added special materials, and the heat conductivity was not good.

Because the heat conductivity of copper wires is not good.

Because there are other substances between the links of the electric furnace wire.

The copper wire connected to the electric furnace wire will generally have other substances in the middle.

Because they've designed it for this situation, with some special materials.

They have thought about the situation and have already set it in advance. Overheated copper wires will break.

When the electric furnace is in use, the electric furnace wire and the wire are connected in series, and the electric furnace wire = i wire,

Because copper has less resistance, it doesn't heat as much.

Answer C electric furnace wire and copper wire in series, through it the current size and power-on time are equal, because the resistance of the electric furnace wire is large, so the heat generated, so the electric furnace wire is hot after power-on, but the copper wire is not very hot

From the above, it can be seen that options a, b, and d are all incorrect

Therefore, C

According to the principle of electrical engineering, the heating rate of a wire with the same cross-section is directly proportional to the resistivity of the wire. Copper and aluminum are selected for the core of the wire because the resistivity of copper and aluminum is small. Electric furnaces use high-resistance alloys precisely to turn electrical energy into heat.

However, the electric furnace wire itself is the core part of the electrical appliance, so it improves the resistance, converts the electrical energy into heat energy, and realizes the purpose of heating.

The resistance of the electric furnace wire is larger than that of the wire.

Answer: The wire and the electric furnace wire together form a series circuit, in the series circuit, when working, the current is equal everywhere. In the production of electric furnace wire is the selection of resistivity is relatively large alloy materials, and the wire is the selection of very good conductivity of materials, plus the diameter of the electric furnace wire is very thin, and the diameter of the wire is thicker, so the resistance value of the electric furnace wire is much larger than the wire, then in the case of a certain total voltage, the voltage drop on the electric furnace wire is much greater than the voltage drop on the wire, according to the formula p=iu, so the power consumed on the electric furnace wire is much greater than the power on the wire.

As a result, there is almost no feeling of heat.

When the electric furnace is in use, the electric furnace wire and the wire are connected in series, 0 electric furnace wire = 0 wire, the energizing time t is the same, p = 0nrt, r electric furnace wire r wire, the heat generated by the current:

P electric furnace wire P wire, so the electric furnace wire is hot and red, but the wire is almost not heated;

A: Because the resistance of the electric furnace wire is large, it generates a lot of heat