2014 Tech study guide: resistors, capacitors and capacitance, inductors and inductance, batteries

Below is the “Electronics principles and components: resistors and resistance, capacitors and capacitance, inductors and inductance, batteries” section of the 2014 edition of the No-Nonsense Technician Class License Study Guide. As always, comments welcome…Dan

A resistor is the electrical component used to oppose the flow of current in a DC circuit. (T6A01) Most resistors have a fixed value, which is specified in ohms.

Some resistors are variable, that is you can change the resistance of the resistor by turning a shaft or sliding a control back and forth. These variable resistors are called potentiometers. A potentiometer is the type of component that is often used as an adjustable volume control. (T6A02) Resistance is the electrical parameter that is controlled by a potentiometer. (T6A03)

The type of electrical component that consists of two or more conductive surfaces separated by an insulator is a capacitor. (T6A05) A capacitor is the electrical component that stores energy in an electric field. (T6A04) Capacitance is the ability to store energy in an electric field. (T5C01) The farad is the basic unit of capacitance. (T5C02)

The type of electrical component that stores energy in a magnetic field is an inductor. (T6A06) The electrical component that is usually composed of a coil of wire is an inductor. (T6A07) The ability to store energy in a magnetic field is called inductance. (T5C03) The henry is the basic unit of inductance. (T5C04)

A switch is the electrical component used to connect or disconnect electrical circuits. (T6A08)

A fuse is the electrical component used to protect other circuit components from current overloads. (T6A09)

As amateur radio operators, we often use batteries to power our radio equipment. Some types of batteries are rechargeable, while others are not. The battery type that is not rechargeable is the carbon-zinc battery. (T6A11) All of these choices are correct when talking about battery types that are rechargeable (T6A10):

  • Nickel-metal hydride
  • Lithium-ion
  • Lead-acid gel-cell

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Comments

  1. Bill Cutherbert says:

    Oh my, now I see why my beloved USA is falling behind in math/technology/university on the world stage. Lack of rigor brings down real world knowledge and this sad trend plagues our country at every level. Your book helps students pass the exam but not learn proper physics. Also, what is with the short, choppy and very verbose grammar? You asked for opinions, hope you can listen to them.

    • Dan KB6NU says:

      Hi, Bill. My book is designed to help people pass the test, not teach them mathematics or physics. It’s my feeling that they are in a better position to learn these things if they have a license than if they are required to learn them before they get a license, and I stress that getting a license is only the first step in the lifelong learning journey that is amateur radio.

      Keep in mind that we’re talking about amateur radio here. An amateur radio license is not a degree in electrical engineering. Even more specifically, the Technician Class license is the very first rung on the amateur radio ladder. How much knowledge would you require of someone just starting out in our hobby/service?

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