Why does the current generate heat and consume it when it encounters resistance?

1.According to Ohm's law q=i rt, the greater the resistance, the greater the heat production, and the resistance is actually the conversion of electrical energy into heat energy, which is the process of energy conversion, not chemical change. It's like a light bulb converts electrical energy into light and heat.

2.Because the resistance of a superconductor is 0, the amount of heat generated is zero according to the formula.

4 "Resistance" is an obstruction, not the ability to keep the current in itself, resistance is a physical quantity that indicates the magnitude of the conductor's action on the current. Therefore, when the voltage is constant, the greater the resistance, the greater the obstruction effect on the current, so the smaller the current (the definition of the magnitude of the current: the amount of charge passing through a certain section per unit time.

So the "current" is not left, it just slows down the movement of the charge, and the state of matter does not change. "Once the electricity is left behind, it burns like fire??? Has the state of matter changed?

There is a mistake in this problem itself, as mentioned above it is an energy conversion problem, which does not involve a change in the state of matter, because the resistor converts electrical energy into heat energy, the resistance will only heat up.

I admire your truth-seeking spirit, and some questions can only be studied when you are in college or graduate school, and your level of understanding is not yet at that level. At present, you just need to understand the basic concepts and principles.

The current is the opposite direction of the flow of electrons, and when the electrons collide with the surrounding electrons during motion, the potential energy will be converted into kinetic energy, and in the process of motion, it will be converted into the kinetic energy and heat energy of the collision.

Your problems can all be boiled down to the movement of electric currents, and all problems are clear when the current motion is clarified, and the conservation of energy is clarified.

1. Because the charge movement of the external circuit depends on the electrostatic force to do the work, and the resistance has an obstructive effect on the work done by the electrostatic force, the heat generation is not a chemical reaction.

2. Superconductors do not produce heat.

3q=i²rt

4. Hindering effect, hindering the movement of electrons.

It's not a sentence or two.

Answer: The heat generated by the current through the conductor is proportional to the square of the current, proportional to the resistance, and proportional to the time of energizing, which is Joule's law. The formula is:

q=i²rt

In a purely resistive circuit, the relationship between the heat generated by the conductor and the resistance is in one of two ways:

1.In a series circuit, since the current of each appliance is the same, according to Joule's law, the circuit is connected in seriesA large electrical resistance generates a lot of heat

2.In a parallel circuit, the voltage at both ends of each appliance is the same, according to Q=(U t) R,The one with less resistance generates more heat.

In a resistive circuit, the smaller the resistance, the greater the current, the greater its heat generation, the greater the resistance, the smaller the current, the smaller the heat generation.

Such a simple problem is so complicated, it is very simple, the greater your resistance, the greater the pressure of the minute, so when we are connected in series, we generally use p=i 2r to calculate, that is, when in series, the power is proportional to the resistance.

For example: connect two resistors in parallel on the same power supply, compare the calorific value of the two resistors, that is, the voltage must be connected in series with the two resistors on the same power supply, and compare the calorific value of the two resistors, that is, the current must be connected to the kettle in the home circuit, and the voltage is certain, so the total resistance in the circuit is heating when it is small, and the total resistance is heat preservation when it is large.

For constant current sources, p u r;

For constant voltage sources, p i r.

The wire and electrical resistor always form a series circuit with the power supply, and the meaning of u here refers to the voltage at both ends of the electrical resistor, that is, the voltage drop on the resistor. In series circuits, a large resistor always accounts for a larger voltage. The resistance of the wire is always very small, and the voltage at both ends of the wire is also very small, that is, the voltage drop on the wire may be only a few tenths of a volt, and the square of the small voltage is smaller, so the resulting electrical power is also very small.

The voltage of the circuit is mainly applied to both ends of the electrical resistor. Using the P u R formula separately, different voltages are substituted. The resulting heat is also different.

As a result, the electrical resistor generates a large amount of heat, while the wire generates relatively little heat.

The wire connected to the rice cooker and the rice cooker are connected in series, and the voltage distributed on the wire is much smaller than the voltage distributed by the rice cooker, so you will know what the heating power is when you actually calculate it!

Just like the transmission line on the telephone pole outside, you see that it is a high-voltage transmission, with a transmission voltage of thousands of volts and tens of thousands of volts, but the heat of the wire itself is very small, because the voltage that falls on the resistance of the wire itself is very small.

In the actual calculation, for the case of series connection, p=i 2 x r is used to calculate the heating power. In the example of high-voltage power transmission, the power p of the transmitted electrical energy is constant, and according to Ohm's law, when the voltage is high, the current decreases, so the heating power of the wire also decreases. Does that make sense?

The relationship between the magnitude of the total resistance in a circuit and the amount of heat generated.

The relationship between heat and resistance depends on the prerequisites, if the voltage is constant, q=u r*t can obtain heat and resistance is inversely proportional, that is, the greater the resistance, the smaller the heat, if the current is constant, q=i rt, the heat and resistance are proportional, that is, the greater the resistance, the greater the heat When is the voltage must be and when is the current constant? If there are 2 resistors in the series circuit that are used to heat the kettle, how should you determine when it is in the heating state and when it is in the holding state, and how should the resistors be connected? I don't know if it's clear, but I often can't tell the difference between these kinds of topics.

The problem is mainly in the first half: it is unscientific to introduce r=u 2 p according to p=u 2 r, because the necessary condition for p = u 2 r is that r is a pure resistance, that is, the resistance is constant, but when the work is done, the resistance will change, and it is not valid; Moreover, in p=u 2 r, u is not the "rated voltage", but the actual voltage. Therefore, it is unscientific to derive with p=U2R.

This should be the case when the current flowing through the resistor is constant.

When the current passes, the resistance is large, just like the greater the resistance, if the current wants to pass, you must overcome the resistance of the resistance, the greater the resistance, the greater the need to overcome, you will consume the current, and the final destination of these currents is to convert into heat.

Only if the current is determined, will there be a greater resistance and more heat generated.

Thermal power formula: w=u2r=i2r; where u is the voltage, r is the resistance, and i is the current intensity;

As can be seen from the above formula, in the case of constant voltage u, the greater the resistance, the less heat; But when the current intensity i is constant, it becomes that the greater the resistance, the more heat.

You're wrong about that question, you didn't even get all the stuff in the physics books.

The greater the resistance, the greater the heat.

Resistance is a physical quantity that describes the electrical conductivity of a conductor and is denoted by R. The resistance is defined by the ratio of the voltage u at both ends of the conductor to the current i passing through the conductor, i.e., r=u i.

Therefore, when the voltage at both ends of the conductor is constant, the greater the resistance, the smaller the current passing through; Conversely, the smaller the resistance, the greater the current that will pass through.

Therefore, the magnitude of the resistance can be used to measure the strength of the conductor's resistance to the current, that is, the conductivity is good or bad. The amount of resistance is related to factors such as the material, shape, and volume of the conductor, as well as the surrounding environment.

Resistance heating is due to the flow of current, no matter how large the resistance is, it will not heat up without current flowing.

The work (power) done by an electric current per unit of time is dissipated as heat.

It is expressed by the formula: p (power) = i (current value) * r (resistance value) So the magnitude of the resistance value and the magnitude of the current determine the amount of heat generated. In particular, the value of the current is proportional to its square.

That is, the greater the resistance value when the current is the same, the greater the heat generation; If the resistance value is the same, the greater the heat generated by the current flowing.

When the current flows through the conductor, it is necessary to generate heat, and the amount of heat is related to the square of the current, the resistance and the energizing time, this relationship is summarized by the British physicist Joule, so it is called Joule's law, and the formula is written as q rti 2......This formula can be applied to any circuit.

In purely resistive circuits, the heat calculation can also be ...... using the formula q=(tu2)r, since i=u rto calculate.

1. According to the formula, when the current is the same as the time, the greater the resistance, the more heat.

For example, if the resistor R1 is connected to R2 in series, when R1 > R2, R1 has more heat than R2.

Another example: the electric furnace is connected to the circuit with a wire, and the electric furnace is so hot that it turns red; However, the heat of the wire is very little, so little that it is almost imperceptible. It is because the resistance of the wire is very small, according to the junior high school physics textbook

Copper wires of about 1 meter used in the laboratory have a resistance of less than a few hundredths of a euro".

2. According to the formula, when the voltage is the same as the time, the greater the resistance, the less heat.

For example, if the resistor R1 is connected in parallel with R2, when R1 > R2, R1 has less heat than R2.

Different circuits, different results.

The heat generated on the resistor usually refers to the heat generated by the conversion of electrical energy into heat energy inside the resistor. In the circuit, when there is an electric current passing through the resistor, the electrons collide with atoms or ions inside the resistor and lose energy, which reduces the average kinetic energy of the electrons, and at the same time causes the temperature inside the resistor to rise, and the macro idea releases the energy in the form of Joule heating.

The heat released refers to the heat released during chemical reactions or physical changes, such as the heat generated by combustion, the heat released by thermochemical reactions, etc.

The difference between the two is that resistance heat is converted into heat by electricity and released, whereas the heat released is heat generated by other means such as chemical reactions.

**The relationship between the heat generated by the current and the resistance requires the use of an galvanometer and a resistor.

An ammeter is an instrument used to measure electric current, usually consisting of an ammeter and a resistor. The purpose of the ammeter is to convert the current into a pointer or number that can be read, while the resistor is used to limit the amount of current and prevent the circuit from being overloaded.

A resistor is a device designed to control the size of the resistor, usually consisting of a wide variable resistor and a fixed resistor. Variable resistors can be adjusted in size, while fixed resistors are used to maintain the stability and accuracy of the circuit.

Using galvanometers and resistors, the amount of heat generated in a circuit can be calculated by measuring the magnitude of the current and resistance. According to Ohm's law, the product of current and resistance is equal to voltage, while the product of voltage and current is equal to power. Therefore, Shenpai can calculate the power and heat in a circuit by measuring the current and resistance.

Heat generated by the loss of sales q = i 2xrxt = 2x10 -3) 2x2x10 3x60 =

That is, the heat generated by the wide resistance through the current within 1 minute is joules.

Summary. The relationship between the heat generated by the resistance and the resistance is determined by Ohm's law, i.e., the greater the value of the resistance, the greater the heat generated through that resistance. The reason why this relationship cannot be changed by controlling the voltage is the same because the voltage is the power source of the circuit and the driving force that generates the current in the circuit, and the heat generated by the resistance can only be controlled by changing the magnitude of the resistance or current, and the control voltage cannot change the characteristics of the resistor, and thus the heat generated by the resistor cannot be changed.

Fellow, I really didn't understand, I can be more specific.

The relationship between the heat generated by the resistance and the resistance is determined by Ohm's law, i.e., the greater the value of the resistance, the greater the heat generated through that resistance. The relationship between the absolute macro cannot be changed by controlling the same voltage, because the voltage is the power source of the circuit, and it is the driving force that generates the current in the circuit, and the heat generated by the resistance can only be controlled by changing the magnitude of the resistance or current, and the control of the electric and voltage cannot change the characteristics of the resistance, and thus the heat generated by the resistance cannot be changed.