With a diode tube you have no control over the current flow and it can only be used as a rectifier, where the triode consist of a control grid, to control the flow of electrons that will reach the anode, this make it possible to use the triode as a amplifier, compared to a transistor the control grid have the same function as the base of the transistor.Advantages?Over tetrodes and pentodes:1. Operation at higher radio frequencies,2. Lower noise figures,3. Simpler circuitry and only one power supply.
negative
A rotating anode promotes cooling between exposures by distributing the intense beam from the cathode over the surface of the anode. A rotating anode tube lasts a lot longer than a stationary x-ray tube.
Whenever you measure resistance, the resistance itself cannot be negative!When an SCR (Semiconductor Controlled Rectifier) is not conducting, it has a high resistance between its anode and its cathode. When its gate is triggered and the SCR is conducting, it has a low resistance between its anode and its cathode.For more information about SCRs, see the answer to the Related Question (for which a link is shown below) and also the Related Link.
Gas discharge tubes are what cause the formation of the anode rays. Several thousand bolts are put towards the cathode, which is apart of the gas discharge tubes, and the anode. This creates the anode rays.
"Triode valve" does not make sense. Please restate the question.Umm... yes, it *does* make sense.Triode "valve" is non-U.S. English for Triode tube.OK.Amplification factor is the amount of anode voltage change to give a chosen amount of anode current change, compared to the amount of grid voltage change for the same anode current change.The symbol is u (it's actually the Greek character for m), and it's called "mu".That is, using "d" for "amount of change":dVa/dVg for equal dIa.Typical values are as low as 2 (6AS7/6080 regulator valve) to 12 (6C4/12AU7 medium-mu triode) to around 100 (6AV6 high-mu triode).Some special microwave triode have mu values in the 300s.
A grid in a high-vacuum triode is usually kept negatively charged with respect to the cathode so that the electrons may be passed through to the anode, but controlled by changes in grid voltage. The triode accomplishes this by amplifying signals applied.
a tetrode is used when you need a screen grid tube, but a suppressor grid tube can't be used.OK, but the question was "why use a tetrode instead of a triode?"So, the answer...1. A tetrode has a higher voltage/power gain than a triode.2. A tetrode has less anode-grid feedback capacitance than a triode, and can operate in common-cathode radio frequency circuits without the neutralisation (or other corrective circuitry) that is needed by a triode.
There are three electrodes: cathode (filament) grid and anode. The "third" will be the one you do not already know the name of.
A triode is a vacuum-tube (US) aka valve(UK) with three electrodes : an anode, a cathode and a grid. The cathode is heated electrically which boils off a cloud of electrons. The anode is made positive ( typ. 100-500V) which attracts the electrons towards it. The grid is an open structure, usually of thin wires, placed between the anode and cathode, but nearer the cathode. If a negative voltage is applied to the grid the current flow through the tube is reduced. The more negative, the less current. Prior to the development of transistors, tubes were used for all things in radio,TV and electronics. Different tubes had different numbers of electrodes; the triode was particularly suited to high power amplifiers, especially at radio frequencies. Triodes are still used today by shortwave radio stations, and for RF heating equipment.
A 'Triode Valve' is a vacuum tube amplifier or switch of the simplest form. It has three parts: A heated cathode, a control grid and an collection plate anode.Electrons are emitted from the cathode and drawn towards the positive anode. Interposed between the two is a control grid that controls the cathode-to-anode electron flow by being charged appropriately, for example a negative charge (ground) on the grid will hamper the flow since the negative electron charge on the grid will obstruct the electron flow to the positive anode.OK, but the question was "use as an amplifier".In a triode, the anode current responds to the grid voltage, as explained above.Now, if a load (and the simplest load is a resistor) is placed between the anode terminal and the supply voltage, the anode current will create a voltage drop across the load resistor.If the anode current varies, so will the voltage across the anode load resistor.A varying grid voltage causes a varying anode current, so a varying grid voltage causes a varying voltage across the load resistor.Now, if one volt of grid voltage change only causes one volt of load resistor change voltage change, it's not much use.A triode can give a greater load voltage change than the grid voltage that caused it. This is amplification, where voltage out is more than voltage in.Typical voltage gains range from a low of just about 2.0 to high values over 70 times.
If this is for your Penn-foster test i can tell you one thing is that the the answer isn't "accelerated toward the anode".
With a diode tube you have no control over the current flow and it can only be used as a rectifier, where the triode consist of a control grid, to control the flow of electrons that will reach the anode, this make it possible to use the triode as a amplifier, compared to a transistor the control grid have the same function as the base of the transistor.Advantages?Over tetrodes and pentodes:1. Operation at higher radio frequencies,2. Lower noise figures,3. Simpler circuitry and only one power supply.
the grid is negative so it can control the amount of electrons coming off the cathode. To stop or decrease intensity of cathode ray/electron beam, it is made more negative (to repel electrons as negative charge and negative charge repel) and to increase intensity, the grid is made less negative.
the two types of anode is stationary anode and rotating anode
Hard to answer this one.The triode is a diode with a control electrode (the grid) added.The only useful answer is that a triode is a voltage-controlled doide.Try asking the question so that it can be answered more usefully.
it has low resistance because the electrode are placed close together..the raised pressure in the anode compartment is disadvantage too.