Delmar's Standard Textbook of Electricity (MindTap Course List)
6th Edition
ISBN: 9781285852706
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 14, Problem 1PA
To determine
The device used to correct the problem of high voltage spike produced by the relay and way of installation.
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You are an electrician working in a plant that uses programmable controliers to parform much of the logic for the motor controls. The plant produces highly flammable chemicals, so the programmable controllers use a 24-volt DC output that is intrinsically safe in a hazardous area. You are having trouble with the output modules of the programmable controllers that are connected to DC control relays. These outputs are going bad at an unusually high rate, and you suspect that spike voltages produced by the relay coils are responsible. To test your theory, you connect an oscilloscope to an output that is operating a DC relay coil and watch the display when the programmable controller turns the relay off. You discover that there is a high voltage spike produced by the relay. What device would you use to correct this problem, and how would you install it?
5.- Design a microcontroller system to control a sprinkler controller that performs the following tasks. We assume that your microcontroller is clocked at 10 MHz and has a 16-bit free-running counter. The sprinkler controller system controls two different zones by turning the sprinklers within each zone on and off. To turn on the sprinklers in a zone, the controller needs to receive a 152.589 Hz PWM signal from its microcontroller. To turn off the sprinklers in the same zone, the controller needs to receive the PWM signal with a different duty cycle.
B.- After 15 min, your microcontroller must send the PWM signal with a 15% duty cycle of 10 ms to turn off the sprinklers in zone one.
a) Buses are conductive routes in a microprocessor's circuitry. This means that there is potential for current to flow among the various parts. Expertly classify and explain the functions of these buses as they pertain to microprocessors.When talking about a microprocessor, b) what are the key distinctions between data and instructions?
Chapter 14 Solutions
Delmar's Standard Textbook of Electricity (MindTap Course List)
Ch. 14 - What determines the polarity of magnetism when...Ch. 14 - What determines the strength of the magnetic field...Ch. 14 - 3. Name three factors that determine the amount of...Ch. 14 - 4. How many lines of magnetic flux must be cut in...Ch. 14 - Prob. 5RQCh. 14 - Into how many time constants is an exponential...Ch. 14 - 7. Each time constant of an exponential curve is...Ch. 14 - 8. An inductor has an inductance of 0.025 H and a...Ch. 14 - Refer to the circuit shown in Figure 14-21. Assume...Ch. 14 - Prob. 10RQ
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