Question

In forward-biasing V-I characteristic, the curve rises linearly after barrier voltage

• A. reduces to zero
• B. is overcome
• C. rises to infinity
• D. None of the above

Answer 1

Answer: (B)

is overcome

The diode itself offers some potential barrier which do not allow the electrons and the holes to cross the junction due to which the current flow through the diode. But as soon as the potential barrier is overcome, the current starts to flow linearly according to the equation given as-

$I=\frac{V_{applied}-0.7}{R}$

Note: Barrier potential (or knee voltage) of silicon diode is equal to $0.7V$.