11-23 A certain thermocouple provides outputs in the vicinity of 0.05 mV/°C with a constant k equal to 5 x 10-5 mV/°C and 7₁ = 80°C; the cold junction is kept in ice. Compute the resultant electromotive force. 11-24 Using the same thermocouple as in Problem 11-23. find the temper- ature of the hot junction if the output voltage is 5 mV. (Hint: Use an approximate equation by deleting the second term.) 11-25 The circuit of Fig. 11-18 is being used for temperature measurement. A "15-k" thermistor (Fig. 11-16) is used. The meter is a 100-μA ammeter with a resistance of 1800, R is set to 8 KQ, and the supply voltage V, is 10 V. What will the meter read at 100°F and at 400°F? 11-26 In Problem 11-25 a 150-mV voltage is applied to the thermistor in series with a relay. What temperature causes the relay to be ener- gized? (The energizing current is 1 mA.) 11-27 We are given the circuit of Fig. 11-23 using a 10-V supply voltage. A current of 5 mA flows when the cell is illuminated with about 400 lm/m², and deenergized when the cell is dark. Find (a) The required series resistance R₁. (b) The level of dark current. 11-28 The input voltage of Problem 11-27 is decreased to 10 V. Find (a) The current flowing at 400 lm/m². (b) The level of dark current. 11-29 Given the photodiode circuit (Fig. 11-25) and photodiode character- istic curve with the load line (Fig. 11-24). at an illumination of 5000 lm/m², find (a) The diode current. (b) The IR drop across R₁. (c) The diode drop. 11-30 We are given the same photodiode and characteristic curve of Problem 11-29. The photodiode is forward-biased at an illumination of 20,000 Im/m². Find. (a) The diode current. (b) The IR drop across R₁. (c) The diode drop. (d) The resistance of the photodiode. 11-31 Given the circuit and characteristic curve of Fig. 11-28, at an illumination level of 300 W/m², find
11-23 A certain thermocouple provides outputs in the vicinity of 0.05 mV/°C with a constant k equal to 5 x 10-5 mV/°C and 7₁ = 80°C; the cold junction is kept in ice. Compute the resultant electromotive force. 11-24 Using the same thermocouple as in Problem 11-23. find the temper- ature of the hot junction if the output voltage is 5 mV. (Hint: Use an approximate equation by deleting the second term.) 11-25 The circuit of Fig. 11-18 is being used for temperature measurement. A "15-k" thermistor (Fig. 11-16) is used. The meter is a 100-μA ammeter with a resistance of 1800, R is set to 8 KQ, and the supply voltage V, is 10 V. What will the meter read at 100°F and at 400°F? 11-26 In Problem 11-25 a 150-mV voltage is applied to the thermistor in series with a relay. What temperature causes the relay to be ener- gized? (The energizing current is 1 mA.) 11-27 We are given the circuit of Fig. 11-23 using a 10-V supply voltage. A current of 5 mA flows when the cell is illuminated with about 400 lm/m², and deenergized when the cell is dark. Find (a) The required series resistance R₁. (b) The level of dark current. 11-28 The input voltage of Problem 11-27 is decreased to 10 V. Find (a) The current flowing at 400 lm/m². (b) The level of dark current. 11-29 Given the photodiode circuit (Fig. 11-25) and photodiode character- istic curve with the load line (Fig. 11-24). at an illumination of 5000 lm/m², find (a) The diode current. (b) The IR drop across R₁. (c) The diode drop. 11-30 We are given the same photodiode and characteristic curve of Problem 11-29. The photodiode is forward-biased at an illumination of 20,000 Im/m². Find. (a) The diode current. (b) The IR drop across R₁. (c) The diode drop. (d) The resistance of the photodiode. 11-31 Given the circuit and characteristic curve of Fig. 11-28, at an illumination level of 300 W/m², find
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter21: Resistive-capacitive Series Circuits
Section: Chapter Questions
Problem 6RQ: A 15-F AC capacitor is connected in series with a 50 resistor. The capacitor has a voltage rating...
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Transcribed Image Text:11-23 A certain thermocouple provides outputs in the vicinity of
0.05 mV/°C with a constant k equal to 5 x 10-5 mV/°C and 7₁ = 80°C;
the cold junction is kept in ice. Compute the resultant electromotive
force.
11-24 Using the same thermocouple as in Problem 11-23. find the temper-
ature of the hot junction if the output voltage is 5 mV. (Hint: Use an
approximate equation by deleting the second term.)
11-25 The circuit of Fig. 11-18 is being used for temperature measurement.
A "15-k" thermistor (Fig. 11-16) is used. The meter is a 100-μA
ammeter with a resistance of 1800, R is set to 8 KQ, and the
supply voltage V, is 10 V. What will the meter read at 100°F and at
400°F?
11-26 In Problem 11-25 a 150-mV voltage is applied to the thermistor in
series with a relay. What temperature causes the relay to be ener-
gized? (The energizing current is 1 mA.)
11-27 We are given the circuit of Fig. 11-23 using a 10-V supply voltage.
A current of 5 mA flows when the cell is illuminated with about
400 lm/m², and deenergized when the cell is dark. Find
(a) The required series resistance R₁.
(b) The level of dark current.
11-28 The input voltage of Problem 11-27 is decreased to 10 V. Find
(a) The current flowing at 400 lm/m².
(b) The level of dark current.
11-29 Given the photodiode circuit (Fig. 11-25) and photodiode character-
istic curve with the load line (Fig. 11-24). at an illumination of
5000 lm/m², find
(a) The diode current.
(b) The IR drop across R₁.
(c) The diode drop.
11-30 We are given the same photodiode and characteristic curve of
Problem 11-29. The photodiode is forward-biased at an illumination
of 20,000 Im/m². Find.
(a) The diode current.
(b) The IR drop across R₁.
(c) The diode drop.
(d) The resistance of the photodiode.
11-31 Given the circuit and characteristic curve of Fig. 11-28, at an
illumination level of 300 W/m², find
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