Students **: ** heard, the current is the movement of electrons in school. An electron with a negative charge, which move to the cathode, the negative power supply is always opposite from the direction of the current, which is how it ah?
Moreover, the current direction of the electrons move in the opposite direction, it's not too much trouble you, and why they are not the same direction? Heard in school, the current is moving electrons. An electron with a negative charge, which move to the cathode, the negative power supply is always opposite from the direction of the current, which is how it ah?
Moreover, the current direction of the electrons move in the opposite direction, it's not too much trouble you, and why they are not the same direction?
** Teacher: ** Before using particular electronic circuits, also do need to first understand what the nature of electrons. To this end, we just inserted by means of fluorescent plates in a vacuum glass tube Crooks (Crooks) to do some test tube will understand this problem. In science and engineering laboratory in high school or grade Gao will have a Crookes tube, we certainly hope to try.
To take advantage of the well-known induction coil of the experiment, the two ends of the impeller Crookes tube from opposite d.c. still pressed. Coated with a fluorescent substance on the Crookes tube impeller, the impeller can rotate left and right sides while moving.
If a Crookes tube end on the positive power supply (+), b terminating the negative electrode (a) the power supply, then, the impeller will move from the negative electrode to the positive electrode. Think about it, what does this mean? By the way, since the negative electrode connection terminal b ejected from the impeller something to push the end of a reason.
Students **: ** can be considered to be ejected from a b-side end electronic thing is it?
** Teacher: ** so much electronic as it is an electron beam into more appropriate. Thus, they form the electron flow, also called a cathode ray.
So, if the positive and negative electrodes, then the reverse connection, the impeller will move in the opposite direction another!
Yes, definitely injected from the anode connected to one end of the flow of electrons toward the positive direction of the impeller.
Students **: ** Oh! Please wait a moment! Yes, I understand now end Crookes tube connected to the negative power supply from the cathode-ray is emitted, but after all, can not explain it is the e-ah!
** Teacher: ** Indeed, in order to illustrate the cathode ray is the flow of electrons, the experiment must also do the job again.
When the plus electric or magnetic field in a cathode ray traveling on the route, the traveling direction of the cathode ray deflection occurs.
Phenomenon described above, a cathode ray negatively charged fine particles with a stream. Further, according to the degree of displacement of the traveling direction of rays, you can find the ratio of the measured amount of mass m e is set and the particles carried by particles.
Regardless of how to replace the gas tube and the electrode material, the measured results are the same, it is described a cathode ray, which is commonly referred to the same electronic configuration of one charged particle.
However, prior to understand these facts, it has been the predetermined direction of the current flowing from the positive electrode to the negative power supply, thus causing the current direction opposite to the moving direction of the electronic results.
To observe the nature of electrons, Crookes tube is a very simple tool. Indeed, a television picture tube oscilloscope (Braun tube) in the electron flow, are the same thing in the wire moving electrons and scattered electrons diodes and transistors inner essence.
