2006-11-30 06:43:19 · 15 answers · asked by rma 1 in Science & Mathematics ➔ Engineering
It will flow in either direction if the voltage is above 0.7 volts
2006-12-01 20:19:29 · answer #1 · answered by R 3 · 0⤊ 3⤋
If the diodes were in series, no current would flow until the voltage exceeded the breakdown voltage of the diode. This configuration of diodes is not commonly used. However, if the diodes were connected in parallel you would see a voltage drop (forward voltage drop of diode) across the diodes. This configuration is often used to detect a bi-directional current flow through the diodes (a resistor in parallel with diodes would also be required).
2006-11-30 11:27:25 · answer #2 · answered by Anonymous · 2⤊ 0⤋
In an ac (alternating current) circuit you would create a rectifier (converts ac to dc). Basically only allows half of sine wave to pass.
Connection would be:
ac source / first diode / load / second diode / back to ac source
I don't think it makes much sense to have them facing opposite if they are together, unless the load if fed from the connect between them.
2006-11-30 07:03:01 · answer #3 · answered by MustangGT 2 · 0⤊ 0⤋
Let's consider both parallel and series circuit configurations for three types of diodes: conventional silicon diodes, Schottky diodes, and Zener diodes.
Two conventional silicon diodes or two Zener diodes connected in parallel but in opposite directions would limit or clip any voltage placed on them to around ± 0.7 volts. If they were Schottky diodes, the voltage would be closer to ± 0.3 volts. This configuration requires current limiting from the source voltage to prevent overcurrent damage to the diodes.
Two conventional silicon diodes or two Schottky diodes connected in series but in opposite directions would not conduct but appear as a high impedance. The voltage placed on them should not exceed the diode's rated breakdown voltage.
Two Zener diodes connected in series but in opposite directions function similar to the two conventional silicon diodes in parallel, limiting or clipping the voltage applied to them, except the voltage is much higher and is equal to the Zener reverse breakdown voltage plus around 0.7 volt for the other diode. The configuration works for both a positive or negative applied voltage. Current limiting from the source voltage is required to prevent overcurrent damage to the diodes.
2006-11-30 16:28:16 · answer #4 · answered by Tech Dude 5 · 3⤊ 0⤋
In series, no current flow in either direction.
In parallel, current flow in either direction when the voltage reaches about 0.7V.(for silicon diodes)
These are the bases for some interesting circuits.
The series pair can be used in product detector circuits.
The parallel pair can be used in harmonic mixer circuits.
They are found in radio receiver design.
2006-11-30 16:34:03 · answer #5 · answered by charley128 5 · 1⤊ 0⤋
No current would flow in the circuit.
A diode limits current flow to one direction. Putting two in the opposite way would limit current flow in both directions -- no current.
2006-11-30 06:46:08 · answer #6 · answered by Anonymous · 1⤊ 0⤋
As indicated already, in parallel, current, in series, no current, but I would like to ADD:
A diode does not conduct forward, below a certain voltage, typically around 0.7 volts. (Higher, maybe 1.2 volts for an LED). So, you get a non-linearity, as the voltage passed through zero, no conduction occurs.
2006-11-30 10:05:45 · answer #7 · answered by unterdemwetter 2 · 1⤊ 0⤋
As diodes only conduct in one direction, there would be no current flow.
2006-11-30 06:50:37 · answer #8 · answered by ispooky2 2 · 1⤊ 0⤋
no current.
add two more diodes in the appropriate configuration and you have just made an AC/DC converter.
2006-11-30 06:47:37 · answer #9 · answered by timc_fla 5 · 1⤊ 0⤋
It really depends on whether they are in series or parallel.
In series - the circuit will not work.
In parallel - the circuit will work in different ways depending on how it is driven.
2006-11-30 06:53:14 · answer #10 · answered by ratdog 3 · 2⤊ 0⤋