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The cathode/anode are shaped the way they are to increase the concentration of electrons going in the proper direction. Basically focusing without losing too many.
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Does the same electron move in the whole circuit?
No. It is more like one electron bumping into the next electron - passing along its energy.
Why do electrons behave like tiny magnets?
a spinning electron produces a magnetic field that makes the electron behave like a tiny magnet
What did JJ Tomson's atoms look like?
J. J. Tomson was the discoverer of the electron. Using a cathode ray tube he found a particle that was deflected by a positively charged plate. Today we call cathode ray tubes televisions (at least the ones with picture tubes). He called the new particle a "corpuscle". Today we call it an electron (derived from the Greek word for "amber" which can be used to generate static electricity). Based on his research, he reasoned that the new particle had a negative charge. He proposed that an atom was like a mushy ball with raisins (electrons) stuck in the surface. Just like a tasty English holiday treat called Plum Pudding. Since atoms are usually electrically neutral (no charge), he reasoned that the mushy part had a positive charge (which would cancel the negative charge of the electron). Americans would say it was more like the electrons were chocolate chips in a scoop of chocolate chip ice cream or the chocolate chips in a scoop of chocolate chip cookie dough. (the repeated use of chocolate has nothing to do with the model). LA Dacanay
Describe how electrons produce electricity?
The electron flow from the cathode to anode give rise to electric current from the anode to cathode but conventional direction of the current is taken from cathode to anode. The electrons in the conductor follow a falling domino effect and at anytime in the conductor the electrons number is always constant.
Do liquids have definite shape like solids.why?
No they don't because liquids have no definite shape like water when you put it in a square shaped beaker and you put water in a cylinder shaped beaker they don't have the same shape right? So that's why they don't have a definite shape. Thanks! :)
What is the left leg of the led called?
Cathode and an anodeThey are called the "anode" and the "cathode", just like every other diode ever built.
What is state of matter forms when a fluorescent light bulb is turned on?
when a fluorescent light bulb is turned on, the state in it is still gaseous state. no change of state occurs by turning it on. It functions like a CRO(search cathode ray oscilloscope). one end acts as a cathode and the other as an anode. electron beam is produced by the cathode and it moves toward the anode. on thier way to anode, electrons collide with the walls of the glass. on the inside of the glass, it is coated with such a material that when electron collides with that surface, it produces a small flash of light. when millions of electrons do that, we see a bulb turned on.
What is the difference between anode led and cathode led?
A: A LED is a diode and like all diode they have an [anode] meaning positive terminal and a [cathode] negative terminal. Therefore the proper potential must be applied for it to behave like an LED.
What is the positive terminal of a diode known as?
It is called the positive + terminal or post, just like you list. Electrons flow for the negative - to the + terminal contrary to popular belief.Another AnswerAs electrons flow through the external circuit from anode (negative terminal) to the cathode (positive terminal) , then the answer is 'cathode'.
How does a vacuum tube work?
contains only a heated electron-emitting cathode and an anode. Electrons can only flow in one direction through the device—from the cathode to the anode. Adding one or more control grids within the tube allows the current between the cathode and anode to be controlled by the voltage on the grids.[5]
What are the three terminals of a silicon bilateral switch?
Anode, Cathode and Gate. Like in a SCR
What is the cathode in an electrochemical cell?
The electrode at which a reduction reaction occurs.PhysicsA cathode is the element of an electron tube from which electrons flow. Back in the day, current was thought to be positive, but we understand things differently now. In the "old school" version, the cathode was the element into which positive charges flowed. But that's usually not what is taught for the simple reason that it's a classical physics approach and isn't at all as useful as the idea that the cathode is the element from which electrons leave to go to the plate.In a two-element tube, the cathode has a compliment called the anode, or plate. Electrons flow from the cathode to the anode. Not the other way. There are tubes with three, four, and more elements, but they have these two basic elements.ChemistryThe cathode is the electrode of a polarized electrical device, such as a galvanic cell, out of which positive electric current flows. In a battery like the one in a vehicle, the positive terminal is the cathode. The car battery, which is a lead-acid battery, also has an electrode that is the compliment to the cathode: the anode. It's the negative terminal of the battery, and positive electric current flows into this electrode.The Wikipedia article on the cathode covers both the chemistry application of the term as well as the physics application, and a link is provided.
How does the first tv work?
If you have read How Television Works or watched What If I Shot My TV?, then you have heard about electron guns. They sound a little bit like something out of "Star Wars," but they're actually the devices that are the heart of most TVs and computer monitors.The idea behind an electron gun is to create electrons and then accelerate them to a very high speed. In a cathode ray tube (CRT) -- the big glass tube used in most televisions and computer monitors -- the electrons get aimed at the screen, where they light up the phosphor on the screen to create the image.The electron gun from a CRT computer monitor is about the size of a roll of quarters. It contains the heater, cathode, focusing anode and accelerating anode for three electron beams.The electron gun starts with a small heater, which is a lot like the hot, bright filament of a regular light bulb. It heats a cathode, which emits a cloud of electrons. Two anodes turn the cloud into an electron beam:The accelerating anode attracts the electrons and accelerates them toward the screen.The focusing anode turns the stream of electrons into a very fine beam.When the electrons leave the accelerating anode, they are traveling at a reasonable fraction of the speed of light, and this gives them a lot of energy. When they hit the phosphor coating on the back of the front glass, the phosphor converts the electron beam's energy to photons and lights up.A black-and-white TV has a single electron gun, while a color TV needs three guns because each pixel on the screen is made of a red, a green and a blue dot.
How do microbial fuel cells work?
When an organism respires it produces electrons which are normally passed to a terminal electron acceptor. For many organisms this is oxygen. In environments where there is no oxygen, such as in sediments and in soils, organisms use different terminal electron acceptors. Common alternatives are Nitrate and Sulphate but some bacteria are known to use solid compounds as a terminal electron acceptor. There are some species of bacteria that can use iron as a terminal electron acceptor. The ability of some bacteria to reduce (that means give electrons to) iron in sediments is exploited in Microbial Fuel Cells. The microbes (bacteria) reduce an electrode (called the anode) by using it as a terminal electron acceptor as they metabolise (eat) high energy compounds such as sugars. By linking the anode to another electrode (called the cathode) you can make a circuit that electrons can flow through. Just imagine it like a battery, the anode is the negative terminal and the cathode is the positive terminal and the electrons come from the sugar, pass through the bacteria (giving it energy on the way) and are then passed to the anode.
What is function of battery?
It stores electrical energy charge which then provides power to the circuit. Electricity is the stream of electrons through a conductive way like a wire. This way is known as a circuit. Batteries have three sections, an anode (- ), a cathode (+), and the electrolyte. The cathode and anode (the positive and negative sides at either end of a conventional battery) are snared to an electrical circuit.
What is the positive terminal of the battery called?
It is called the positive + terminal or post, just like you list. Electrons flow for the negative - to the + terminal contrary to popular belief.Another AnswerAs electrons flow through the external circuit from anode (negative terminal) to the cathode (positive terminal) , then the answer is 'cathode'.
Why does a diode not conduct in reverse bias?
A diode cannot conduct in reverse bias because of the way it was made. If the question is asking about a thermionic vacuum tube diode, the electrons produced by the heated cathode of the tube can only move in one direction: from the cathode to the anode - but only for as long as the anode is positively charged. The reason is that, if the anode is made to be positively-charged, it ATTRACTS electrons - which are negatively charged - from the cathode, so a current flows from cathode to anode in the "normal" biased direction because of the physical fact that UNLIKE CHARGES ATTRACT ONE ANOTHER. If the anode is made to be negatively charged, the electrons won't go to it because of the physical fact that LIKE CHARGES REPEL ONE ANOTHER, so no electrical current can flow from the cathode to a negatively charged anode. (In fact no electrical current can ever flow from a negative anode to the cathode for an entirely different reason: no anode of any normal thermionic vacuum tube was ever designed and made to "produce" electrons in the way that a heated cathode produces them!) To be able to "produce" electrons and let them fly to the positively charged anode, the cathode must be able to receive some more electrons to replace all the ones that have left the space around the cathode. That "supply of more electrons" is called an electric current. That current does not come from nowhere - it has to comes from a source, such as a battery or a generator - and the electrons which reach the anode must then be conducted back to the battery or a generator so that they complete a full electrical circuit by traveling along the wires which connect the source to the diode. Similarly, because of the way it was made, a semiconductor diode behaves in just the same way as a vacuum tube diode: electrons can flow from the negative end to the positive end of the semiconductor diode but not the other way around. The actual reason why a semiconductor diode works like that is very much more complicated to explain than for a vacuum tube diode. Put very simply, a semiconductor diode has the kind of materials inside it that will only allow electrons to flow one way. If a voltage is applied to the diode the wrong way round (called reverse bias) practically no current can flow through the diode.
