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There may be a flat on the round base (on round ones) = cathode
The larger electrode inside is the cathode.
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∙ 11y ago
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When a voltage is applied across a diode and current flows we say the diode is what?
One description would be forward biased.
When building a bridge rectifier how do you choose the right size diode?
By figuring out how much amperage you wish to pass through the diode. If for instance you are building a battery charger and the transformer would normally supply 10 amps, you would select a diode (or diodes in parallel) that would handle at least 10 amps. You would normally select diodes that are at least 125% of the current desired. In this example you would select a diode that would handle at least 12.25 amps. It is better to use a rating of 150% for a safety margin.
If a diode is connected to a battery and a lamp what happens when the diode direction is reversed?
I diode allows current to flow in only one direction. Therefore, if a lamp is "on" in a DC circuit, and the diode in series with the lamp is reversed, the light will be turnned off due to the diode blocking current flow (unless the voltage is above the breakdown voltage of the diode - if this is the case, the diode will fail). If this is an AC circuit, every half cycle the diode will turn on, then the next half cycle it will turn off. To your eye, the bulb will most likely appear slightly dim due to this on then off cycling. If the diode is reversed, there will be no apparent change. The difference is the half cycle the diode would have been off before reversing, it will now be on, etc.
Is it can say as a 4.9v zener diode If you connect seven 0.7v silicon diodes in forward bias in series?
When the design says 4.9v zener diode that is all I would put. The more complicated an alternative you try the more things that can go wrong. A silicon diode is not the same as a zener diode, and cannot be used to replace a zener, with reasonable expectation that the circuit will continue to operate as designed.
What colour insulation leads would you use to colour code the leads of a thyristor?
Red for anode, black for cathode, blue for gate.
Why is the negative peak of the carrier wave discarded by a diode in demodulation?
It's caused by the action of the diode. A diode conducts when its anode is positive to its cathode, or... when its cathode is negative to its anode. The above statements are saying the same thing. You circuit is applying the carrier wave to the anode, and taking output from the cathode. The diode will conduct and pass the positive peaks of the carrier from its anode to its cathode and through to the load (next component/s after the diode), but diode action will not permit conduction any time when the carrrier wave swings into negative voltage on the anode. You *could* turn the dioe around - then you would get only the *negative* peaks of the carrier wave passing through to the load.
How would you determine if the diode were good or defective?
Firstly, to be absolutely certain, one leg of the diode should be unsoldered and lifted from the Printed Circuit Board (PCB). There are many considerations here:- The Power must be disconnected from the device, you will need a suitably sized soldering iron, you will need a solder sucker or wick and solder to reinstall. Some previous soldering experience would also be valuable. Secondly, you will need a Digital Multimeter (DMM) with a diode test function. Assuming the above, identify the Anode and the Cathode of the diode as follows: The Cathode is generally marked with a painted or etched band or stripe. Using the DMM, switched to the Diode Symbol, red lead plugged into the + terminal, black lead plugged into the - terminal, put the red lead on the Anode and the black lead on the Cathode of the diode. A good silicon diode should indicate between 0.6 & 0.7V on the display of the DMM. Reverse the lead connections at the diode and the display should read "OL", which means the maximum reverse voltage is applied and no current flows. An indication of 0V in one or both directions or OL in both directions means a faulty diode.
How does a diode clips the wave when it is forward biased in clipper circuits?
A diode only allows current to flow in one direction. When the voltage exceeds 0.6 volts it will not allow more voltage to flow. Putting two diodes cathode to anode would limit the voltage both ways.
Why do people have unmarked graves?
unmarked graves are often the results of a war or conflict where bodies would be found but would not of been identified. if they could not be identified then they would most often be given a unmarked grave.
What kind of sign does anode has?
An anode is positive, Cathode is negative. As such, an anode would usually be denoted as + If that is what you meant.
What sort of diode do you need when putting a solar cell on a battery powered device?
There are two basic types of diodes; Silicon and Germanium. I would use germanium because it has a lower forward bias than silicon. I suspect that what you really want to know is how to hook up an isolation diode. This is a diode that is installed in series with the alternate power source to isolate one from the other. Whether you use germanium or silicon the way that you want to hook it up is pretty straight-forward. go ahead and hook the negative (black) lead of the solar cell to the negative (black) lead of the battery. Hook up the positive (red) lead of the solar cell to the anode of the isolation diode and the cathode end of the diode hooks up to the positive (red) lead of the battery. You can identify the anode and cathode ends of the diode by looking on the diode - you will see a little diagram that looks like an arrow with a straight line at the tip of the arrow. the straight line side is the cathode end. Unless you have a really big solar panel you could probably use a general purpose diode such as a 1N4001 silicon (available at radio-shack)Hope this helped you.
Does a diode allow electricity to flow in one direction?
Diodes come in so many different types and uses. Your statement does hold true to a certain point. They are highly valued for their diverse applications. The zener diode which is the rare exception because this semiconductor is usually reverse biased ( installed backwards) to function in the circuit. These were primarily designed to be voltage regulators available in a wide variety of voltages and types. In Engineering terms this operates in the avalanche region (reversed). All other types would run forward biased (in conduction). The anode is the positive end and the cathode negative.
What are stationary anode x ray tubes?
An x-ray tube where the anode is held still, rather than rotated as would happen in the rotating anode tube.
Why would you not have an anode rod?
Anode rods are used in RV and home hot water heaters. Aluminum tanks are not required to have an anode rod where steel tanks usually are.
What would be formed at the cathode and the anode during the electrolysis of sodium hydroxide solution?
Hydrogen gas would evolve from the cathode and oxygen gas would evolve from the anode.
What will happen when plus 5V is applied to a 4.7V zener diode in reverse bias condition?
Since the zener conducts and regulates voltage in reverse bias, the 5V would bias the zener on with a 4.7V drop. If the 5V source had a low enough impedance, the zener or the source would self destruct.
What are valves which were used in the making of first generation of computer?
Known as `tubes' in America. Valves were glass containers where electrodes where encased in a vacuum. E.g. a diode valve would have two electrodes, an anode and a cathode there would also be two pins for the heater. The heater would `boil' electrons off the cathode to be captured by the anode (clearly this would only work one way). A triode valve would also have a grid to control electrode flow, other valves with more grids for finer control would be named according to the number of electrodes discounting the heater pins in the count.
