July 2012
Beginner
576 pages
9h 46m
English
Content preview from Complete Electronics Self-Teaching Guide with Projects
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Switches
31 A mechanical switch is a device that completes or breaks a circuit. The most familiar use is that of applying power to turn a device on or off. A switch can also permit a signal to pass from one place to another, prevent its passage, or route a signal to one of several places.
In this book, you work with two types of switches. The first is the simple on-off switch, also called a single pole single throw switch. The second is the single pole double throw switch. Figure 1.11 shows the circuit symbols for each.
Keep in mind the following two important facts about switches:
- A closed (or ON) switch has the total circuit current flowing through it. There is no voltage drop across its terminals.
- An open (or OFF) switch has no current flowing through it. The full circuit voltage appears between its terminals.
The circuit shown in Figure 1.12 includes a closed switch.
Questions
A. What is the current flowing through the switch? __________
B. What is the voltage at point A and point B with respect to ground? __________
C. What is the voltage drop across the switch? __________
Answers
A. 
B. VA = VB = 10 volts
C. 0 V (There is no voltage ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.