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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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October 1960 Popular ElectronicsTable of Contents
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Popular Electronics was published from October 1954 through April 1985. All copyrights are hereby acknowledged. See all articles from Popular Electronics.
Here is a different type of quiz from Popular Electronics' master quiz-maker, Robert P. Balin. Rather than the typical format where you need to match a word or another picture with a picture, this one requires you to consider each description and decide whether it best describes an inductive, capacitive, or reactive circuit. I confess to messing up on question 20, because I couldn't remember whether a lagging power factor referred to voltage lagging current or current lagging voltage. Hint: It refers to current lagging voltage. Another hint: Remember the ELI the ICE man mnemonic.
Resistive? Inductive? or Capacitive? Quiz
By Robert P. Balin
In all of electricity and electronics, there are only three basic properties: resistance, inductance, and capacitance. These properties, or combinations of them, can give us complete control over current, voltage, phase, and power in any electric circuit.
Since resistive, inductive, and capacitive circuits operate on entirely different principles, each type of circuit has a distinctive character of its own. But regardless of where or how these three basic properties are used, they retain their individual characteristics. From the descriptions of their behavior given below, can you identify the type of circuit referred to?
Fill in the blank with R if you think the circuit is resistive; L, if inductive; and C, if capacitive.
1) Electrical energy can remain stored in this type of circuit even after the source of energy is removed ___
2) The current in this type of circuit is always in phase with the source of voltage ___
3) Arcing is likely to occur between the contacts when this circuit is opened ___
4) Electrical energy is stored in the magnetic fields found in this type of circuit ___
5) This circuit tries to keep its voltages constant ___
6) The flywheel effect is characteristic of this type of circuit ___
7) Electrostatic fields are used in this circuit ___
8) This type of circuit always has unity power factor ___
9) This circuit acts almost like a short circuit to a.c. voltages ___
10) Voltage across this circuit builds up to a high potential instantaneously when the circuit is opened ___
11) If the frequency of the source voltage for this circuit is increased, the current goes down ___
12) The current in this circuit leads the source voltage ___
13) This type of circuit can act almost like an open circuit at the instant that power is applied ___
14) No electrical energy is stored in this type of circuit at any time ___
15) Because of the surge currents in this circuit, its fuse may blow when power is applied ___
16) Conductor or component insulation may be damaged when power is removed from this circuit ___
17) This type of circuit tries to keep its current constant ___
18) Current never actually flows through this type of circuit ___
19) In this circuit the current remains the same regardless of changes in the frequency of the source voltage ___
20) This type of circuit has a lagging power factor ___
Answers to Circuit Quiz
Posted June 17, 2014