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Transistors have many characteristics and they most certainly require voltages to be a certain polarity if they are to work properly. There are two main types of transistor: PNP and NPN. They are identical except that all polarities are reversed on one compared to the other. There are many books and online resources that describe transistors but here is a very brief note about transistor operation. Each transistor has a base, a collector and an emitter. When a small current is passed from the base to the emitter, a larger current will pass from the collector the the emitter. With an NPN transistor, the base needs to be positive with respect to the emitter and the collector also has to be positive with respect to the emitter for the transistor to work. A PNP transistor is reversed, where both the base and the collector need to be negative with respect to the emitter to operate. Therefore, transistors do indeed have a polarity, even if it is more complex that some other devices. Disclaimer: The above description of transistor operation is greatly simplified and there are operational modes that are outside the conditions described. Please don't use the above description as a definitive guide to transistor behaviour.
Karen Luettgen
Wiki User
∙ 15y agoAside from plugging it into the board and hoping it doesn't blow up, the best way (what we do in engineering school) is to get the manufacturer and model of the diode and look up the technical data sheet on the web. This will give you all the info you'll ever need. Regular diodes standard marking is a stripe of paint or marking denoting as that end being the cathode of the diode. But there are many other types of diodes that differs from this marking tunnel diodes, zeners. and so forth.
Wiki User
∙ 10y agoyes, diode is a unipolar device which allows the current to flow in one direction
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What problems are there with reverse polarity?
Reversing polarity ,changes the rotation of the device you are changing polarity on.
What is the polarity of C Cl14?
Its polarity is zero.CCl4 is non polar
How can the degree of polarity be predicted?
The strength of polarity can be determined from looking at the level of polarity an object has. Polar bonds can make objects stronger or weaker.
Do potentiometers have polarity?
no there is no consideration of positive or negative legs in case of resistor.
What is the molecular polarity of F2?
Polarity occurs when an atom of a chemical bonds to the electrons rather than the other atoms. F2 polarity occurs when the atoms in the bond are the same.
Why the diode called polarity switch explain?
A diode will only conduct electricity if the polarity of the current is in the correct direction, because diodes can only conduct in one direction.
What would go bad if you wired an alternator reverse polarity?
You would probably toast the diodes in the alternator.
Materials used in constructing a full wave rectifier?
Full wave rectifiers consist of two (for a center-tapped transformer) or four (for a single-ended transformer) diodes connected such that as the polarity of the AC input changes, the diodes steer the current flow so the output polarity does not change. The output of a FW rectifier is pulsating DC, which is normally then filtered or smoothed with a capacitor.
What happens if you don't connect the LED in its required polarity?
Why nothing at all, of course there will be no light.LEDs being diodes are polarity sensitive devices, which means they will only conduct electricity in one direction. Only when an LED conducts will it emit light.
How do you find out what systems are damaged after connecting the battery in reverse on a 1989 Ford F-150?
You can count on the alternator diodes being fried. But you might be able to have it tested. After that, much of the OTHER stuff has protection. Unfortunately, polarity protection is difficult if not impossible with an alternator.
What rule is used to find out polarity of a current carrying solenoid?
right hand rule is used to find out the polarity of current
Why computer has no light?
If it is otherwise running, you have probably hooked the leads backwards. The panel lights on computers are light emitting diodes and they will only light up when hooked with the correct polarity.
How many diodes should you expect to find in a bridge rectifie?
four
What happens if you use reverse polarity battery on car plus keep POS-POS NEG-NEG?
If you operate any electrical device even turning on the ignition, you risk burning out any diodes.
How do you fix the alternator on a 1998 Cadillac Deville?
One usually does not repair these units. You will need access to a high pressure 12 ton, press to open unit for bearing replacement.. Cheaper to take unit to a electrical repair shop. If you are game, the usual problem is bearings, the diodes are fairly stable, but one can have it checked, for free, at the local auto store. If not, you will need a VOM meter, ohmeter checker, and check the each diodes, you will need to separate the diodes so you can get it into a testing arrangement. Diodes, or rectifiers, are one way valves, so when you attach the probes of VOM meter, set to the 100 ohm scale, and run a polarity test. One connection will show continuity, while a reverse polarity test should show, a open connection.
Will reverse polarity damage equipment?
Reversing polarity will most likely damage electronic equipment, especially semiconductor components such as transistors, diodes and LED devices if the voltage is high enough. Other devices may not function at all, will be unaffected (such as incandescent light bulbs), or may work backwards (such as some DC motors.
What are the major classification of diodes?
1. general purpose diodes 2. fast recovery diodes 3. schottky diodes
