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Resistance is used in characterizing silicon diodes, or any component for that matter, because the equivalent resistance in a certain condition tells you what the circuit will do in that condition.
It is true that a diode is not a resistor, but it has an equivalent resistance at each point on it operating curve. Let take three points, for example...
With one ampere of current, the forward voltage might be 0.68 volts. That corresponds, using Ohm's law, to a resistance of 0.68 ohms. With ten amperes of current, the forward voltage might be 1.15 volts. That corresponds to a resistance of 0.115 ohms. With 25 amperes of current, the forward voltage might be 1.7 voltage. That corresponds to a resistance of 0.068 ohms.
You can obtain the forward resistance curve from the manufacturer's data sheet. Even if there is only a voltage versus current curve, you can calculate resistance using Ohm's law.
You need to know the resistance curve in order to design the circuit that uses the diode. In high performance situations, such as in large power supplies, the resistance of the diode may well be critical, and would therefore be a factor in selecting which diode amongst several choices to choose.
What else can I help you with?
Can you use resistance in place of diode in clipping circuits?
no we not use resistance in place of diode.
Which diode does not use negative resistance in its operation?
Backward diode
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.
How test diac?
To test a diode, you can use a multimeter set to the diode testing mode. Connect the positive lead to the anode and the negative lead to the cathode; a good diode will typically show a forward voltage drop of around 0.6 to 0.7 volts for silicon diodes. Reverse the leads; a functioning diode should show no reading or display as open circuit. If the readings are significantly different, the diode may be faulty.
What is the use of crystal detector in electronics?
A crystal detector is a diode, often used in non-powered radio receivers. It conducts at a much lower voltage than a typical silicon diode, making it easier to generate the signal amplitude required from the tuning circuit.
Can you use resistance in place of diode in clipping circuits?
no we not use resistance in place of diode.
Which diode does not use negative resistance in its operation?
Backward diode
What happens if a silicon diode measures high value of resistance with the meter leads in both positions?
If the meter is developing more than the necessary forward breakdown voltage of the diode, typically 0.7 volts, then the diode is bad. However, some meters do not generate enough voltage in resistance mode to bias the diode on, unless you flip a switch that enables diode test mode. Use another meter at the same time to measure the voltage across the diode and compare that with the diode's published forward breakdown voltage.
How do you use a thyristor as a diode?
A thyristor, also known as a silicon controlled rectifier, is a diode that can be turned on by application of a small gate voltage.
How do you find the ac resistance of a diode?
The ac resistance of a diode is found using the equation: (The change in Vd)/(The change in Id) An easier was is to use the Equation: 26mV / Id. This is a general form as the ac resistance of a diode change as the temperature changes.
How do you check if a diode is serviceable?
use a vomm set to infinite resistance if you have reistance one way and not the other way. diode is good (must be isolated from circuit) if no resistance both directions diode D.O.A.
Is it necessary to add a series resistance with the diode or not?
if the diode is forward biasedwell practically the current flows in a circuit if and only if an effective resistance is present in the circuit, if we consider the diode to be ideal (barrier potential but no internal resistance) in this case an external resistance is required if we use the approximate model (both barrier potential and internal resistance are considered) we need not use an external resistance the internal resistance itself acts as the effective resistance.if the diode is reverse biased:-the same explanation applies even if the diode is reverse biased but one must take care that the reverse voltage drop on diode should not increase the peak inverse voltage mark the diode would be burnt or damaged if this phenomena occurs.So this can be prevented by adding suitable resistance to the circuit through which the voltage drop on diode can be managed
How will differentiate silicon and germanium diode from a group of diodes?
Simple, Use the multi-meter , switch to the diode option then connect the positive wire to the positive of diode n negative to the negative ( +ve wire red, -ve wire black) if the there is a reading of =~0.7V then it is silicon. and if it is =~ 0.3V then it is germanium.
What is more referred to use si diode or a ge diode?
silicon diode is preferred more when compared with germanium diode because in silicon diode the operating voltage is 0.7v where as in germanium diode the operating voltage is 0.3v , germanium is temperature sensitive so it can be easily destroyed by increasing temperature hence silicon diode is preferred more
Why resistance is use in circuits?
To prevent excess voltage to enter in a diode or LED etc
How do you use a diode as temperature sensor?
The voltage across a Silicon Diode junction varies 0.00011 volts per degree Kelvin. Connect the diode to a high gain amplifier and the output of the amplifier to a DVM using an appopriate voltage scale.
How do you test diode using multimeter?
A Diode will pass the electrical current into one direction, and will produce high resistance in the opposite direction. To check a diode, use an Ohm-Meter or a "multi meter", and set to measure resistance "Ohm", in the 1k Scale. You will have two leads in the ohm meter + and - (Red and Black) If you measure the resistance in one direction ( red lead touching one of the diode leads , and the black is touching the other lead ) , and you found a low resistance in one direction, and a very high resistance in the other direction ( by reversing the red/black leads) , this diode should be ok. If you find low resistance in both directions, this diode is shorted, and is damaged If you find high resistance in both directions, this diode is open circuit, and is damaged
