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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)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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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
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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