CH.3 - Electricity, Components, and Circuits

Know the schematic symbol for a capacitor.

2 lines. 1 straight, the other concave.

Know the schematic symbol for a battery or voltage source.

4 consecutive lines. long, short, long, short.

T5D10. What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it? A. 1 volt B. 0.25 volts C. 2.5 volts D. 1.5 volts

A. 1 volt

T5C09. How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes? A. 138 watts B. 0.7 watts C. 23.8 watts D. 3.8 watts

A. 138 watts

T5D06. What is the resistance of a circuit that draws 4 amperes from a 12-volt source? A. 3 ohms B. 16 ohms C. 48 ohms D. 8 Ohms

A. 3 ohms

T6D02. What best describes a relay? A. A switch controlled by an electromagnet B. A current controlled amplifier C. An optical sensor D. A pass transistor

A. A switch controlled by an electromagnet

T5A09. What is the name for a current that reverses direction on a regular basis? A. Alternating current B. Direct current C. Circular current D. Vertical current

A. Alternating current

T6D11. What is a simple resonant or tuned circuit? A. An inductor and a capacitor connected in series or parallel to form a filter B. A type of voltage regulator C. A resistor circuit used for reducing standing wave ratio D. A circuit designed to provide high fidelity audio

A. An inductor and a capacitor connected in series or parallel to form a filter

T7A11. Where is an RF preamplifier installed? A. Between the antenna and receiver B. At the output of the transmitter's power amplifier C. Between a transmitter and antenna tuner D. At the receiver's audio output

A. Between the antenna and receiver

T6C12. What do the symbols on an electrical circuit schematic diagram represent? A. Electrical components B. Logic states C. Digital codes D. Traffic nodes

A. Electrical components

T6B10. What are the three electrodes of a PNP or NPN transistor? A. Emitter, base, and collector B. Source, gate, and drain C. Cathode, grid, and plate D. Cathode, drift cavity, and collector

A. Emitter, base, and collector

T6B08. What does the abbreviation FET stand for? A. Field Effect Transistor B. Fast Electron Transistor C. Free Electron Transition D. Field Emission Thickness

A. Field Effect Transistor

T6A09. What electrical component is used to protect other circuit components from current overloads? A. Fuse B. Capacitor C. Inductor D. All of these choices are correct

A. Fuse

T6B12. What is the term that describes a transistor's ability to amplify a signal? A. Gain B. Forward resistance C. Forward voltage drop D. On resistance

A. Gain

T7D03. How is an ammeter usually connected to a circuit? A. In series with the circuit B. In parallel with the circuit C. In quadrature with the circuit D. In phase with the circuit

A. In series with the circuit

T5C12. What is meant by the term impedance? A. It is a measure of the opposition to AC current flow in a circuit B. It is the inverse of resistance C. It is a measure of the Q or Quality Factor of a component D. It is a measure of the power handling capability of a component

A. It is a measure of the opposition to AC current flow in a circuit

T5C08. What is the formula used to calculate electrical power in a DC circuit? A. Power (P) equals voltage (E) multiplied by current (I) B. Power (P) equals voltage (E) divided by current (I) C. Power (P) equals voltage (E) minus current (I) D. Power (P) equals voltage (E) plus current (I)

A. Power (P) equals voltage (E) multiplied by current (I)

T6D05. What type of circuit controls the amount of voltage from a power supply? A. Regulator B. Oscillator C. Filter D. Phase inverter

A. Regulator

T5C02. What is the basic unit of capacitance? A. The farad B. The ohm C. The volt D. The henry

A. The farad

T5A11. What is the basic unit of electromotive force? A. The volt B. The watt C. The ampere D. The ohm

A. The volt

T6B05. Which of the following electronic components can amplify signals? A. Transistor B. Variable resistor C. Electrolytic capacitor D. Multi-cell battery

A. Transistor

T5A05. What is the electrical term for the electromotive force (EMF) that causes electron flow? A. Voltage B. Ampere-hours C. Capacitance D. Inductance

A. Voltage

T5D02. What formula is used to calculate voltage in a circuit? A. Voltage (E) equals current (I) multiplied by resistance (R) B. Voltage (E) equals current (I) divided by resistance (R) C. Voltage (E) equals current (I) added to resistance (R) D. Voltage (E) equals current (I) minus resistance (R)

A. Voltage (E) equals current (I) multiplied by resistance (R)

T5C11. How many amperes are flowing in a circuit when the applied voltage is 12 volts DC and the load is 120 watts? A. 0.1 amperes B. 10 amperes C. 12 amperes D. 132 amperes

B. 10 amperes

T5D11. What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it? A. 1 volt B. 10 volts C. 11 volts D. 9 volts

B. 10 volts

T5D04. What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts? A. 3 ohms B. 30 ohms C. 93 ohms D. 270 ohms

B. 30 ohms

T5C10. How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes? A. 4.8 watts B. 30 watts C. 14.5 watts D. 0.208 watts

B. 30 watts

T7D01. Which instrument would you use to measure electric potential or electromotive force? A. An ammeter B. A voltmeter C. A wavemeter D. An ohmmeter

B. A voltmeter

T6A04. What electrical component stores energy in an electric field? A. Resistor B. Capacitor C. Inductor D. Diode

B. Capacitor

T6A11. Which of the following battery types is not rechargeable? A. Nickel-cadmium B. Carbon-zinc C. Lead-acid D. Lithium-ion

B. Carbon-zinc

T5D01. What formula is used to calculate current in a circuit? A. Current (I) equals voltage (E) multiplied by resistance (R) B. Current (I) equals voltage (E) divided by resistance (R) C. Current (I) equals voltage (E) added to resistance (R) D. Current (I) equals voltage (E) minus resistance (R)

B. Current (I) equals voltage (E) divided by resistance (R)

T5A04. What is the name for a current that flows only in one direction? A. Alternating current B. Direct current C. Normal current D. Smooth current

B. Direct current

T7D11. Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter? A. Ensure that the applied voltages are correct B. Ensure that the circuit is not powered C. Ensure that the circuit is grounded D. Ensure that the circuit is operating at the correct frequency

B. Ensure that the circuit is not powered

T7D12. Which of the following precautions should be taken when measuring high voltages with a voltmeter? A. Ensure that the voltmeter has very low impedance B. Ensure that the voltmeter and leads are rated for use at the voltages to be measured C. Ensure that the circuit is grounded through the voltmeter D. Ensure that the voltmeter is set to the correct frequency

B. Ensure that the voltmeter and leads are rated for use at the voltages to be measured

T5A08. Which of the following is a good electrical insulator? A. Copper B. Glass C. Aluminum D. Mercury

B. Glass

T7D02. What is the correct way to connect a voltmeter to a circuit? A. In series with the circuit B. In parallel with the circuit C. In quadrature with the circuit D. In phase with the circuit

B. In parallel with the circuit

T6B07. What does the abbreviation LED stand for? A. Low Emission Diode B. Light Emitting Diode C. Liquid Emission Detector D. Long Echo Delay

B. Light Emitting Diode

T7A03. Which of the following is used to convert a radio signal from one frequency to another? A. Phase splitter B. Mixer C. Inverter D. Amplifier

B. Mixer

T6D01. Which of the following devices or circuits changes an alternating current into a varying direct current signal? A. Transformer B. Rectifier C. Amplifier D. Reflector

B. Rectifier

T6A03. What electrical parameter is controlled by a potentiometer? A. Inductance B. Resistance C. Capacitance D. Field strength

B. Resistance

T5D03. What formula is used to calculate resistance in a circuit? A. Resistance (R) equals voltage (E) multiplied by current (I) B. Resistance (R) equals voltage (E) divided by current (I) C. Resistance (R) equals voltage (E) added to current (I) D. Resistance (R) equals voltage (E) minus current (I)

B. Resistance (R) equals voltage (E) divided by current (I)

T6A01. What electrical component is used to oppose the flow of current in a DC circuit? A. Inductor B. Resistor C. Voltmeter D. Transformer

B. Resistor

T7A01. Which term describes the ability of a receiver to detect the presence of a signal? A. Linearity B. Sensitivity C. Selectivity D. Total Harmonic Distortion

B. Sensitivity

T6B11. What at are the three electrodes of a field effect transistor? A. Emitter, base, and collector B. Source, gate, and drain C. Cathode, grid, and plate D. Cathode, gate, and anode

B. Source, gate, and drain

T6A08. What electrical component is used to connect or disconnect electrical circuits? A. Magnetron B. Switch C. Thermistor D. All of these choices are correct

B. Switch

T7D10. What is probably happening when an ohmmeter, connected across an unpowered circuit, initially indicates a low resistance and then shows increasing resistance with time? A. The ohmmeter is defective B. The circuit contains a large capacitor C. The circuit contains a large inductor D. The circuit is a relaxation oscillator

B. The circuit contains a large capacitor

T0A04. What is the purpose of a fuse in an electrical circuit? A. To prevent power supply ripple from damaging a circuit B. To interrupt power in case of overload C. To limit current to prevent shocks D. All of these choices are correct

B. To interrupt power in case of overload

T6D06. What component is commonly used to change 120V AC house current to a lower AC voltage for other uses? A. Variable capacitor B. Transformer C. Transistor D. Diode

B. Transformer

T6B04. Which of the following components can be made of three layers of semiconductor material? A. Alternator B. Transistor C. Triode D. Pentagrid converter

B. Transistor

T5A02. Electrical power is measured in which of the following units? A. Volts B. Watts C. Ohms D. Amperes

B. Watts

T6B06. How is the cathode lead of a semiconductor diode usually identified? A. With the word cathode B. With a stripe C. With the letter C D. All of these choices are correct

B. With a stripe

T5D09. What is the current flowing through a 24-ohm resistor connected across 240 volts? A. 24,000 amperes B. 0.1 amperes C. 10 amperes D. 216 amperes

C. 10 amperes

T5D08. What is the current flowing through a 100-ohm resistor connected across 200 volts? A. 20,000 amperes B. 0.5 amperes C. 2 amperes D. 100 amperes

C. 2 amperes

T5D05. What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes? A. 18 ohms B. 0.125 ohms C. 8 ohms D. 13.5 ohms

C. 8 ohms

T6B09. What are the names of the two electrodes of a diode? A. Plus and minus B. Source and drain C. Anode and cathode D. Gate and base

C. Anode and cathode

T7D06. Which of the following might damage a multimeter? A. Measuring a voltage too small for the chosen scale B. Leaving the meter in the milliamps position overnight C. Attempting to measure voltage when using the resistance setting D. Not allowing it to warm up properly

C. Attempting to measure voltage when using the resistance setting

What function does a transistor perform? A. Give off light when current flows through it B. Supply electrical energy C. Control the flow of current D. Convert electrical energy into radio waves

C. Control the flow of current

T5A07. Which of the following is a good electrical conductor? A. Glass B. Wood C. Copper D. Rubber

C. Copper

T6B02. What electronic component allows current to flow in only one direction? A. Resistor B. Fuse C. Diode D. Driven Element

C. Diode

T0A05. Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere fuse? A. The larger fuse would be likely to blow because it is rated for higher current B. The power supply ripple would greatly increase C. Excessive current could cause a fire D. All of these choices are correct

C. Excessive current could cause a fire

T6A06. What type of electrical component stores energy in a magnetic field? A. Resistor B. Capacitor C. Inductor D. Diode

C. Inductor

T6D09. What is the name of a device that combines several semiconductors and other components into one package? A. Transducer B. Multi-pole relay C. Integrated circuit D. Transformer

C. Integrated circuit

T6D04. Which of the following can be used to display signal strength on a numeric scale? A. Potentiometer B. Transistor C. Meter D. Relay

C. Meter

T7A08. Which of the following describes combining speech with an RF carrier signal? A. Impedance matching B. Oscillation C. Modulation D. Low-pass filtering

C. Modulation

T6A02. What type of component is often used as an adjustable volume control? A. Fixed resistor B. Power resistor C. Potentiometer D. Transformer

C. Potentiometer

T5A10. Which term describes the rate at which electrical energy is used? A. Resistance B. Current C. Power D. Voltage

C. Power

T6C01. What is the name for standardized representations of components in an electrical wiring diagram? A. Electrical depictions B. Grey sketch C. Schematic symbols D. Component callouts

C. Schematic symbols

T7A04. Which term describes the ability of a receiver to discriminate between multiple signals? A. Discrimination ratio B. Sensitivity C. Selectivity D. Harmonic Distortion

C. Selectivity

T5C04. What is the basic unit of inductance? A. The coulomb B. The farad C. The henry D. The ohm

C. The henry

Return to Main T6C13. Which of the following is accurately represented in electrical circuit schematic diagrams? A. Wire lengths B. Physical appearance of components C. The way components are interconnected D. All of these choices are correct

C. The way components are interconnected

T6B03. Which of these components can be used as an electronic switch or amplifier? A. Oscillator B. Potentiometer C. Transistor D. Voltmeter

C. Transistor

T7A06. What device takes the output of a low-powered 28 MHz SSB exciter and produces a 222 MHz output signal? A. High-pass filter B. Low-pass filter C. Transverter D. Phase converter

C. Transverter

Know the schematic symbol for a transistor.

Circle with a line and arrow.

T5D07. What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? A. 9600 amperes B. 200 amperes C. 0.667 amperes D. 1.5 amperes

D. 1.5 amperes

T5D12. What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it? A. 8 volts B. 0.2 volts C. 12 volts D. 20 volts

D. 20 volts

T6A10. Which of the following battery types is rechargeable? A. Nickel-metal hydride B. Lithium-ion C. Lead-acid gel-cell D. All of these choices are correct

D. All of these choices are correct

T5A01. Electrical current is measured in which of the following units? A. Volts B. Watts C. Ohms D. Amperes

D. Amperes

T7D04. Which instrument is used to measure electric current? A. An ohmmeter B. A wavemeter C. A voltmeter D. An ammeter

D. An ammeter

T7D05. What instrument is used to measure resistance? A. An oscilloscope B. A spectrum analyzer C. A noise bridge D. An ohmmeter

D. An ohmmeter

T5C01. What is the ability to store energy in an electric field called? A. Inductance B. Resistance C. Tolerance D. Capacitance

D. Capacitance

T6A05. What type of electrical component consists of two or more conductive surfaces separated by an insulator? A. Resistor B. Potentiometer C. Oscillator D. Capacitor

D. Capacitor

T6D08. Which of the following is used together with an inductor to make a tuned circuit? A. Resistor B. Zener diode C. Potentiometer D. Capacitor

D. Capacitor

T5A03. What is the name for the flow of electrons in an electric circuit? A. Voltage B. Resistance C. Capacitance D. Current

D. Current

T5C03. What is the ability to store energy in a magnetic field called? A. Admittance B. Capacitance C. Resistance D. Inductance

D. Inductance

T6A07. What electrical component is usually composed of a coil of wire? A. Switch B. Capacitor C. Diode D. Inductor

D. Inductor

T5C13. What are the units of impedance? A. Volts B. Amperes C. Coulombs D. Ohms

D. Ohms

T7A05. What is the name of a circuit that generates a signal of a desired frequency? A. Reactance modulator B. Product detector C. Low-pass filter D. Oscillator

D. Oscillator

T6B01. What class of electronic components is capable of using a voltage or current signal to control current flow? A. Capacitors B. Inductors C. Resistors D. Transistors

D. Transistors

T7D07. Which of the following measurements are commonly made using a multimeter? A. SWR and RF power B. Signal strength and noise C. Impedance and reactance D. Voltage and resistance

D. Voltage and resistance

Know the schematic symbol for an antenna.

a triangle outline with a line of symmetry.

Know the schematic symbol for an LED ( light emitting diode ).

a triangle with a bar underneath. arrows pointing away

Know the schematic symbol for a variable inductor.

bumpy line with an arrow pointing inwards

Know the schematic symbol for a lamp.

looks like an led.

Know how a single- pole, single-throw switch works.

one pole ( one switch ) one throw ( one connection )

Know the schematic symbol for a variable resistor

resistor squiggle with an arrow pointing into it.

Know the schematic symbol for a resistor.

squiggly line

Know the schematic symbol for a transformer.

two parallel lines with a bumpy line on either side.