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Answer all parts of question answers: i) Rmin = 75.6kohm, Rmax 189kohm ii) | = 10mA iii) R max=324ohm = Question 1 continued. d) blon You have been asked to design a burglar alarm. A buzzer will sound if the window is opened. You have been supplied with a circuit diagram (see Figure Qld below), a 9 V battery, a transistor and a buzzer. The buzzer requires 9 V and will operate at currents less than 20 mA. You have access to a range of resistors of any value you require. The transistor specification sheet states that for a given batch the transistor DC current gain varies from 90 to 225. Assume the collector current is 10 mA and the base-emitter voltage is 0.6 V. When window switch is open. i) Determine the range of resistors that will work with this circuit. (ms) ii) Obtain the emitter current. Я When window switch is closed. iii) The maximum power dissipated in the resistor should not exceed 0.25 W. Determine the maximum value of resistance that can be used. definitions of the foll 9 Vier. Stato R Window switch Buzzer Figure Qld

Answer all parts of question answers: i) Rmin = 75.6kohm, Rmax 189kohm ii) | = 10mA iii) R max=324ohm = Question 1 continued. d) blon You have been asked to design a burglar alarm. A buzzer will sound if the window is opened. You have been supplied with a circuit diagram (see Figure Qld below), a 9 V battery, a transistor and a buzzer. The buzzer requires 9 V and will operate at currents less than 20 mA. You have access to a range of resistors of any value you require. The transistor specification sheet states that for a given batch the transistor DC current gain varies from 90 to 225. Assume the collector current is 10 mA and the base-emitter voltage is 0.6 V. When window switch is open. i) Determine the range of resistors that will work with this circuit. (ms) ii) Obtain the emitter current. Я When window switch is closed. iii) The maximum power dissipated in the resistor should not exceed 0.25 W. Determine the maximum value of resistance that can be used. definitions of the foll 9 Vier. Stato R Window switch Buzzer Figure Qld

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter30: Dc Motors
Section: Chapter Questions
Problem 6RQ: What is CEMF?
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Answer all parts of question answers: i) Rmin = 75.6kohm, Rmax 189kohm ii) | = 10mA iii) R max=324ohm =
Transcribed Image Text:Answer all parts of question answers: i) Rmin = 75.6kohm, Rmax 189kohm ii) | = 10mA iii) R max=324ohm =
Question 1 continued. d) blon You have been asked to design a burglar alarm. A buzzer will sound if the window is opened. You have been supplied with a circuit diagram (see Figure Qld below), a 9 V battery, a transistor and a buzzer. The buzzer requires 9 V and will operate at currents less than 20 mA. You have access to a range of resistors of any value you require. The transistor specification sheet states that for a given batch the transistor DC current gain varies from 90 to 225. Assume the collector current is 10 mA and the base-emitter voltage is 0.6 V. When window switch is open. i) Determine the range of resistors that will work with this circuit. (ms) ii) Obtain the emitter current. Я When window switch is closed. iii) The maximum power dissipated in the resistor should not exceed 0.25 W. Determine the maximum value of resistance that can be used. definitions of the foll 9 Vier. Stato R Window switch Buzzer Figure Qld
Transcribed Image Text:Question 1 continued. d) blon You have been asked to design a burglar alarm. A buzzer will sound if the window is opened. You have been supplied with a circuit diagram (see Figure Qld below), a 9 V battery, a transistor and a buzzer. The buzzer requires 9 V and will operate at currents less than 20 mA. You have access to a range of resistors of any value you require. The transistor specification sheet states that for a given batch the transistor DC current gain varies from 90 to 225. Assume the collector current is 10 mA and the base-emitter voltage is 0.6 V. When window switch is open. i) Determine the range of resistors that will work with this circuit. (ms) ii) Obtain the emitter current. Я When window switch is closed. iii) The maximum power dissipated in the resistor should not exceed 0.25 W. Determine the maximum value of resistance that can be used. definitions of the foll 9 Vier. Stato R Window switch Buzzer Figure Qld
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