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Semiconductor Electronics: Materials, Devices and Simple Circuits
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V-I Characteristics of a P-N Junction Diode
V-I Characteristics of a P-N Junction Diode
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V - I Characteristics of P - N Junction Diode
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V - I Characteristics of P-N Junction Diode
2 mins
Problems on V - I Characteristics
2 mins
Important Questions
The
V
-
I
characteristic of a silicon diode is shown in the figure. Calculate the resistance of the diode at
(a)
I
D
=
1
5
m
A
and
(b)
V
D
=
−
1
0
V
.
Medium
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>
In a p-n junction diode, the current I can be expressed as
I
=
I
0
e
x
p
(
2
K
B
T
e
V
−
1
)
, where
I
0
is called the reverse saturation current,
V
is the voltage across the diode and is positive for forward bias and negative for reverse bias, and
I
is the current through the diode,
k
B
is the Boltzmann constant
(
8
.
6
×
1
0
−
5
e
V
/
K
)
and
T
is the absolute temperature. If for a given diode
I
o
=
5
×
1
0
−
1
2
A
and
T
=
3
0
0
K
, then
(a) What will be the forward current at a forward voltage of
0
.
6
V
?(b) What will be the increase in the current if the voltage across the diode is increased to
0
.
7
V
?(c) What is the dynamic resistance?(d) What will be the current if reverse bias voltage changes from
1
V
to
2
V
?
Hard
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>
(a) Calculate the value of
V
0
and I if the Si diode and the Ge diode start conducting at
0
.
7
V
and
0
.
3
V
respectively, in the given circuit.
(b) If the Ge diode connection be reversed. What will be the new values of
V
0
and I?
Hard
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>
Calculate the current through the given circuit. (The diodes are ideal)
Easy
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>
From the graph between current
I
and voltage
V
shown below,identify the portion corresponding to negative resistance
Medium
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>
Draw the circuit arrangement for studying the V-I characteristics of a p-n junction diode (i) in forward bias and (ii) in reverse bias. Draw the typical V-I characteristics of a silicon diode.
Describe briefly the following terms :
(i) " minority carrier injection " in forward bias
(ii) " Breakdown voltage " in reverse bias.
Medium
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If each diode in figure has forward bias resistance of
2
5
Ω
and infinite resistance in reverse bias , what will be the value of current
I
1
,
I
2
,
I
3
and
I
4
?
Medium
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>
The reading of the ammeter for a silicon diode in the given circuit is :-
Medium
JEE Mains
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>
Two wires A and B of same material and same mass have radius
2
r and r. If resistance of wire A is
3
4
Ω
, then resistance of B will be?
Hard
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>
The
V
−
i
graph for a conductor makes an angle
θ
with
V
−
a
x
i
s
. Here
V
denotes the voltage and
i
denotes current. The resistance of conductor is given by
Medium
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>