Electronics - Diodes and Applications - Discussion
Discussion Forum : Diodes and Applications - General Questions (Q.No. 16)
16.
What is the current through the diode?
Discussion:
26 comments Page 3 of 3.
Madhur said:
1 decade ago
Answer is 1mA as they have mentioned it as a ideal diode.
Sandeep kumar gupta said:
1 decade ago
In case of ideal diode in forward bias voltage drop is 0.
Hence i= v/r
i=12/12k
=1mA
Hence i= v/r
i=12/12k
=1mA
Sundar said:
1 decade ago
Forward Voltage Drop:
Electricity uses up a little energy pushing its way through the diode, rather like a person pushing through a door with a spring. This means that there is a small voltage across a conducting diode, it is called the forward voltage drop and is about 0.7V for all normal diodes which are made from silicon. The forward voltage drop of a diode is almost constant whatever the current passing through the diode so they have a very steep characteristic (current-voltage graph).
Electricity uses up a little energy pushing its way through the diode, rather like a person pushing through a door with a spring. This means that there is a small voltage across a conducting diode, it is called the forward voltage drop and is about 0.7V for all normal diodes which are made from silicon. The forward voltage drop of a diode is almost constant whatever the current passing through the diode so they have a very steep characteristic (current-voltage graph).
Munde sudarshan haribhau said:
1 decade ago
If diode is idial then why taken voltage drop as 0. 7.
Harshal said:
1 decade ago
Diode is ideal then why use 0.7v
Devi said:
1 decade ago
Usually we take LED drop voltage as 1.5 . Why here as 0.7 ?
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