Mon December 12, 2011 By: Rashi Agrawal

When do we use a milliammeter and when microammeter in series with a transistor?...Is current in forward biased condition more than reverse bias or is it opposite to that??...WHy? Kindly explain.

Expert Reply
Tue December 13, 2011
Milliammeter is used in the leg that is forward biased and microammeter is used in the leg that is reverse biased. This is because the current in forward bias condition is more than in reverse bias.
In reverse biasing, there is no conduction across the junction due to majority carriers, but a few minority carriers cross the junction and constitute current. The reverse current is limited by the concentration of minority carriers. So, current in reverse bias is less than current in forward bias.
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