An npn transistor has a collector load of 1 kfN. It is used in a circuit with supply rails of 0 V and 9 V. What is the maximum current that the transistor can conduct?
An npn transistor has a collector load of 1 kfN. It is used in a circuit with supply rails of 0 V and 9 V. What is the maximum current that the transistor can conduct?
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Question
an N.P.N transistor has a collector load of 1 ohms .it is used in a circuit with supply rails of 0v and
9v .wha is the maximum current that the transistor can conduct?
![ll Digicel
1 10:33 AM
WhatsApp Image 2021-02-04 a..
34 PROGRESS QUESTIONS
1. In the circuit of Fig. 34.1 what is:
a) the resistance of Tr if it is saturated.
b) I when Tr is saturated,
c) I, when Tr is saturated,
d) I, when Tr is off (not conducting)?
5. Fig. 34.4 shows a relay circuit. The coil of the relay
needs a current of 20 mA to close the contacts.
a) If the current gain h of the transistor is 50, cal-
culate the base current needed for the relay to be
just switched on.
b) Neglecting the base-emitter voltage, calculate
the value of R for this to happen.
+10V
R 100 2
c) What purpose is served by the diode?
d) This circuit may be used as the basis of a frost-
warning alarm in which a lamp is switched on when
the temperature falls below a certain value (which
can be altered). Draw a labelled diagram of such a
%3D
load
모400 2
input
Tr
circuit.
(O.L.E.)
+12 V
Fig. 34.1
ov
2. Given that the h of the transistor in the circuit in
Fig. 34.2 is 100, calculate the collector current and
the potential difference between the collector and
the emitter. (For the purposes of the calculation you
should assume that V = 0.)
relay
BE
(L.)
O OV
Fig. 34.4
o 10 V
6. For the circuit shown in Fig. 34.5:
a) state what conditions, light or dark, cause the
bulb B to be lit,
b) explain how, and why, the potential at the point
X varies as conditions change from light to dark,
c) explain how the bulb B becomes lit.
500 k2
|4.5 k2
Fig. 34.2
OOV
3. An npn transistor has a collector load of 1 k. It is
used in a circuit with supply rails of 0 V and 9 V.
(C.)
What is the maximum current that the transistor
can conduct?
What is the power dissipation (a) in the resistor,
(b) in the transistor, when the collector current is
adjusted to half its maximum value by altering the
base current?
+9 v 6
ove
(O. and C.)
LDR
(light-
dependent
resistor)
4. a) The input voltage shown is applied to the circuit
in Fig. 34.3. Copy the graph and sketch the output
voltage immediately below the input. Indicate val- Fig. 34.5
ues of the output voltage on your output graph.
b) Suggest a value for Rp.
7. What effect does a change in p.d. between the col-
lector and the emitter of a transistor have on the
collector current?
What effect does a change in the p.d. between
the base and the emitter of a transistor have on the
collector current?
Use a sketch graph to illustrate your answer in
each case.
(L.)
V/V4
+10 V
10
1 k
V.
1 2 3
4 t/ms
V.
(L.)
Fig. 34.3
POV
79](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F74d6b413-2306-49c1-827e-25535c710e0f%2Fe120cde8-cd78-4ac2-8c40-7837f3740c5c%2Fuuv9bb_processed.jpeg&w=3840&q=75)
Transcribed Image Text:ll Digicel
1 10:33 AM
WhatsApp Image 2021-02-04 a..
34 PROGRESS QUESTIONS
1. In the circuit of Fig. 34.1 what is:
a) the resistance of Tr if it is saturated.
b) I when Tr is saturated,
c) I, when Tr is saturated,
d) I, when Tr is off (not conducting)?
5. Fig. 34.4 shows a relay circuit. The coil of the relay
needs a current of 20 mA to close the contacts.
a) If the current gain h of the transistor is 50, cal-
culate the base current needed for the relay to be
just switched on.
b) Neglecting the base-emitter voltage, calculate
the value of R for this to happen.
+10V
R 100 2
c) What purpose is served by the diode?
d) This circuit may be used as the basis of a frost-
warning alarm in which a lamp is switched on when
the temperature falls below a certain value (which
can be altered). Draw a labelled diagram of such a
%3D
load
모400 2
input
Tr
circuit.
(O.L.E.)
+12 V
Fig. 34.1
ov
2. Given that the h of the transistor in the circuit in
Fig. 34.2 is 100, calculate the collector current and
the potential difference between the collector and
the emitter. (For the purposes of the calculation you
should assume that V = 0.)
relay
BE
(L.)
O OV
Fig. 34.4
o 10 V
6. For the circuit shown in Fig. 34.5:
a) state what conditions, light or dark, cause the
bulb B to be lit,
b) explain how, and why, the potential at the point
X varies as conditions change from light to dark,
c) explain how the bulb B becomes lit.
500 k2
|4.5 k2
Fig. 34.2
OOV
3. An npn transistor has a collector load of 1 k. It is
used in a circuit with supply rails of 0 V and 9 V.
(C.)
What is the maximum current that the transistor
can conduct?
What is the power dissipation (a) in the resistor,
(b) in the transistor, when the collector current is
adjusted to half its maximum value by altering the
base current?
+9 v 6
ove
(O. and C.)
LDR
(light-
dependent
resistor)
4. a) The input voltage shown is applied to the circuit
in Fig. 34.3. Copy the graph and sketch the output
voltage immediately below the input. Indicate val- Fig. 34.5
ues of the output voltage on your output graph.
b) Suggest a value for Rp.
7. What effect does a change in p.d. between the col-
lector and the emitter of a transistor have on the
collector current?
What effect does a change in the p.d. between
the base and the emitter of a transistor have on the
collector current?
Use a sketch graph to illustrate your answer in
each case.
(L.)
V/V4
+10 V
10
1 k
V.
1 2 3
4 t/ms
V.
(L.)
Fig. 34.3
POV
79
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