How to calculate the work done by Ampere force
Publish: 2021-04-24 01:30:27
1. Not necessarily. Generally, if the ampere force changes linearly, the average ampere force should be used. If the energy conservation is not recommended, is there any specific problem?
2. If the metal rod cuts the magnetic inction line and moves... As long as the ampere force is not perpendicular to the movement direction of the metal rod... The ampere force does work... But the metal rod has no resistance... According to the electrothermal formula... Joule heat will not be generated... The total work done by all forces is converted into the kinetic energy of the metal rod
3. The simplest way for ampere force to do work is to use the formula: w = uit
4. When doing a physics problem, I feel confused:
the conctor bar AB and CD are placed on a smooth horizontal guide rail. As shown in the figure, the direction of magnetic inction intensity is vertical and downward, and the size is B. the CD bar is suspended by a pulley with a mass of M, and the AB bar is released from rest. Let the length of AB and CD be l, the resistance of AB bar be R1, the resistance of CD bar be R2, the guide rail be long enough and the resistance be neglected, and then calculate the relationship between the direction of CD bar's starting motion and the value of uniform velocity V1 of AB bar, It is not necessary to calculate the ampere force on the CD bar, but it is necessary to calculate it when doing problems such as motor. Is there any difference between the two? I know that the calculation is wrong, so I don't need to be wrong.
please forgive me for not typing the figure
the conctor bar AB and CD are placed on a smooth horizontal guide rail. As shown in the figure, the direction of magnetic inction intensity is vertical and downward, and the size is B. the CD bar is suspended by a pulley with a mass of M, and the AB bar is released from rest. Let the length of AB and CD be l, the resistance of AB bar be R1, the resistance of CD bar be R2, the guide rail be long enough and the resistance be neglected, and then calculate the relationship between the direction of CD bar's starting motion and the value of uniform velocity V1 of AB bar, It is not necessary to calculate the ampere force on the CD bar, but it is necessary to calculate it when doing problems such as motor. Is there any difference between the two? I know that the calculation is wrong, so I don't need to be wrong.
please forgive me for not typing the figure
5. The simplest way for ampere force to do work is to use the formula: w = uit
6. The work done by Ampere's force is equal to the Joule heat proced by him. Generally, it is negative work! And the conservation of mechanical energy can't be associated with it.
7. The positive and negative work of all forces depends on the direction of force and motion... Ampere force is no exception... Work is scalar, and its addition and subtraction is algebraic sum
8. First of all, your understanding is wrong. You can't say that work can be transformed into anything! It can only be said that work reflects what energy transforms into what energy
the work done by the ampere force of the former rod is equal to the value of the external energy converted into the electric energy in the circuit
the work done by Ampere force of the latter rod is equal to the value of the electric energy converted into internal energy on the rod
the total process energy conversion is as follows:
the energy supplied by the outside world - the electric energy of the whole circuit (corresponding to the front w a) + the kinetic energy of the front rod, the electric energy in the circuit (corresponding to the rear w a) - the internal energy generated by the two rods + the kinetic energy of the rear rod.
the work done by the ampere force of the former rod is equal to the value of the external energy converted into the electric energy in the circuit
the work done by Ampere force of the latter rod is equal to the value of the electric energy converted into internal energy on the rod
the total process energy conversion is as follows:
the energy supplied by the outside world - the electric energy of the whole circuit (corresponding to the front w a) + the kinetic energy of the front rod, the electric energy in the circuit (corresponding to the rear w a) - the internal energy generated by the two rods + the kinetic energy of the rear rod.
9. Two ways:
1 if the ampere force is constant, it can be solved by w = FS or heating formula q = I square * r * t
2 if the ampere force is variable, the kinetic energy theorem can be used to find the kinetic energy change or the energy conservation can be used to find the energy relationship between the initial state and the final state.
1 if the ampere force is constant, it can be solved by w = FS or heating formula q = I square * r * t
2 if the ampere force is variable, the kinetic energy theorem can be used to find the kinetic energy change or the energy conservation can be used to find the energy relationship between the initial state and the final state.
10. We can use the kinetic energy theorem. Generally, the work done by Ampere force is done by variable force, and the formula of work is not easy to solve. In this case, the kinetic energy theorem is mostly used
how much work is done to overcome the ampere force, how much other forms of energy will be converted into electric energy, and then the electric energy will be converted into Joule heat Of course, it must be a pure resistance circuit)
the heat generated by friction is not included in Joule heat. So your later statement is wrong.
how much work is done to overcome the ampere force, how much other forms of energy will be converted into electric energy, and then the electric energy will be converted into Joule heat Of course, it must be a pure resistance circuit)
the heat generated by friction is not included in Joule heat. So your later statement is wrong.
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