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Is it possible that damaged diode rectifier has normal voltage output but low current meaning low mA?
Lokrum
By themselves, unlikely. Diodes usually fail catastrophically, shorting or opening. More probable is that one diode in the bridge set is open, while the others are functioning, causing the bridge configuration to perform poorly. This could lead, for instance, in normal operating voltage under low load, but poor (excessive) ripple under high load and inability to sustain rated current.
This is a common failure mode in automobile alternators. One diodes pops, causing output voltage to appear normal, but there is insufficient charge current to maintain the battery. If you had an ammeter, you would see barely enough current to hold operating voltage, and you would not see the normal higher then decreasing current following engine start.
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What is full wave rectifire?
The full wave rectifier is a means of converting alternating current (ac) into direct current (dc). It is done with either the use of 2 diodes coming off a center tapped transformer, or by using a bridge rectifier, which conists of 4 diodes ganged together in a certain configuration. As it's name implies, it converts both the positive going and the negative going parts of the sign wave into useable dc, and therefore is more efficient than a half wave rectifier, which only converts 1/2 of the complete sign wave into useable dc.
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What happens with voltage and current by damaged diode...the diode is IN5408?
It depends on how the diode is damaged. There are generally two cases. One, the diode is shorted, and conducts with a low impedance in both directions. The other, the diode is open, and does not conduct, having a high impedance, in both directions. The effect depends on the particular circuit. In a power supply, a shorted diode will often blow the fuse, while an open diode will result in no output, or in high ripple voltage output. Is it possible that diode has normal voltage output but wrong current,meaning low mA?
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