For the network of Fig. 17.19

Fig. 17.19

a. Write an equation for the voltage from gate to ground for the SCR.
b. What is the voltage V_GK when R _S = R?
c. Find R_S to establish a turn-on voltage of 2 V if R' = 10 kΩ.
d. When the alarm turns on, what is the current through the relay?
e. At V _A = 0 V, the maximum dc current through the rate-effect resistor will be established. What is its value?
f. When the reset button is activated, is there any reason for concern about spikes in voltage anywhere in the network? How could they be suppressed?

Transcribed Image Text:

o +12 V Reset 100 k2 (for rate effect) Rs Alarm relay 200 2 Set 1 k2-1 MN 6-12 V