Has anyone ever thought, experimentally, about trying to use compound spirals, maybe even with different materials, or semiconductor styles, in different parts, and other compound shapes, and materials for electronic components?
Example: On the surface of circuit board, etch a twin spiral, with two conductors running parallel to each other as they spiral toward the center, with a solder hole at each ones’ ends so they could be connected to make parallel induction coils, with or without a center connection and with or without a center tap, at the same time (with who knows, what types, or how many possible uses), or left separate to make a capacitor, or used as two parallel inductors.
Or make a coiled wire and then, coil the coiled wire, or wind the coiled, coiled wire again, around a core, or center tap, or any other arrangement(s) – basically letting the mind keep wondering, and keep testing and calculating…..
Want more?
Have they ever tried regular material induction cores, with open ends, or closed at one, or at both ends, even tapped in different ways etc, spiraled Inside of differently shaped (circular, triangular, etc…), solid molded plastic, or other materials, etc, etc, etc…..?
These shape ponderings might lead to some wiled stuff!!!
Since there will always be new things!
Thanks for thinking/pondering with me!

Maybe even with different materials, or semiconductor styles, in different parts, and other compound shapes, and materials for electronic components?
Example: On the surface of circuit board, etch a twin spiral, with two conductors running parallel to each other as they spiral toward the center, with a solder hole at its’ end, or at a location in it, so they could be connected to make parallel induction coils, with or without an inner end connection and with or without a center tap, at the same time (with who knows, what types, or how many possible uses), or left separate to make a capacitor, or used as two parallel inductors, which would probably work and behave like a tank circuit, and could be adjusted by how the lines are spaced, and by how many time each is wound, or maybe even a type of antenna, or set of antennas.

Or make a coiled wire, and then, coil the coiled wire, or wind the coiled, coiled wire again, around a core, or center tap, another wire, or any other arrangement(s) – basically letting the mind keep wondering, and keep testing and calculating…..

Want more?
Have they ever tried standard material and/or other material, induction cores, made with open ends, closed at one, or at both, tapped in different ways, spiraled in different shapes (circular, triangular, etc…), or coated with molded plastic, at different thicknesses, etc, etc….?
Since there will always be new things, these shape ponderings might lead to some wiled stuff!!!

To me, learning from a book is basically memorizing what is already known, but real learning happens when your imagination kicks-in!

Thanks for thinking/pondering with me, and I hope it gets and keeps you wondering too!!!

Maybe even with different materials, or semiconductor styles, in different parts, and other compound shapes, and materials for electronic components?
Example: On the surface of circuit board, etch a twin spiral, with two conductors running parallel to each other as they spiral toward the center, with a solder hole at its’ end, or at a location in it, so they could be connected to make parallel induction coils, with or without an inner end connection and with or without a center tap, at the same time (with who knows, what types, or how many possible uses), or left separate to make a capacitor, or used as two parallel inductors, which would probably work and behave like a tank circuit, and could be adjusted by how the lines are spaced, and by how many time each is wound, or maybe even a type of antenna, or set of antennas.

Or make a coiled wire, and then, coil the coiled wire, or wind the coiled, coiled wire again, around a core, or center tap, another wire, or any other arrangement(s) – basically letting the mind keep wondering, and keep testing and calculating…..

Want more?
Have they ever tried standard material and/or other material, induction cores, made with open ends, closed at one, or at both, tapped in different ways, spiraled in different shapes (circular, triangular, etc…), or coated with molded plastic, at different thicknesses, etc, etc….?
Since there will always be new things, these shape ponderings might lead to some wiled stuff!!!

To me, learning from a book is basically memorizing what is already known, but real learning happens when your imagination kicks-in!

Thanks for thinking/pondering with me, and I hope it gets and keeps you wondering too!!!

Maybe even with different materials, or semiconductor styles, in different parts, and other compound shapes, and materials for electronic components?
Example: On the surface of circuit board, etch a twin spiral, with two conductors running parallel to each other as they spiral toward the center, with a solder hole at each ones’ ends so they could be connected to make parallel induction coils, with or without a center connection and with or without a center tap, at the same time (with who knows, what types, or how many possible uses), or left separate to make a capacitor, or used as two parallel inductors.
Or make a coiled wire and then, coil the coiled wire, or wind the coiled, coiled wire again, around a core, or center tap, or any other arrangement(s) – basically letting the mind keep wondering, and keep testing and calculating…..
Want more?
Have they ever tried regular material induction cores, with open ends, or closed at one, or at both ends, even tapped in different ways etc, spiraled Inside of differently shaped (circular, triangular, etc…), solid molded plastic, or other materials, etc, etc, etc…..?
These shape ponderings might lead to some wiled stuff!!!
Since there will always be new things!
Thanks for thinking/pondering with me!

Maybe even with different materials, or semiconductor styles, in different parts, and other compound shapes, and materials for electronic components?
Example: On the surface of circuit board, etch a twin spiral, with two conductors running parallel to each other as they spiral toward the center, with a solder hole at each ones’ ends so they could be connected to make parallel induction coils, with or without a center connection and with or without a center tap, at the same time (with who knows, what types, or how many possible uses), or left separate to make a capacitor, or used as two parallel inductors.
Or make a coiled wire and then, coil the coiled wire, or wind the coiled, coiled wire again, around a core, or center tap, or any other arrangement(s) – basically letting the mind keep wondering, and keep testing and calculating…..
Want more?
Have they ever tried regular material induction cores, with open ends, or closed at one, or at both ends, even tapped in different ways etc, spiraled Inside of differently shaped (circular, triangular, etc…), solid molded plastic, or other materials, etc, etc, etc…..?
These shape ponderings might lead to some wiled stuff!!!
Since there will always be new things!
Thanks for thinking/pondering with me!

1. When electric current is flowing in a circuit, if the voltage applied to the circuit is increased,

A. the resistance will increase.
B. the current will increase.

C. the resistance will decrease.

D. the current will decrease.

2. Which of the following information sources will not be directly affected by the Telecommunications Act of 1996?

A. Telephone services
B. The Internet

C. Newspaper publishing

D. Cable television

3. Porcelain, paper, glass, and rubber are all examples of electrical

A. conductors.
B. batteries.

C. insulators.

D. grounds.

4. A testing instrument that an electronics technician will connect to selected points inside a piece of electronic equipment and measure electrical values such as ohms, volts, and amperes is called

A. a signal generator.
B. a power supply.

C. an oscilloscope.

D. a multimeter.

FIGURE A-1—Use this illustration to answer Question 5.

5. Look at the four schematic symbols shown in Figure A-1. Each of the symbols is labeled with a number. Which of the following statements about these symbols is correct?

A. Symbol 1 represents a diode, symbol 2 represents a resistor, symbol 3 represents an LED, and symbol 4 represents a transistor.
B. Symbol 1 represents a diode, symbol 2 represents an LED, symbol 3 represents a transistor, and symbol 4 represents a resistor.

C. Symbol 1 represents a transistor, symbol 2 represents a resistor, symbol 3 represents an LED, and symbol 4 represents a diode.

D. Symbol 1 represents a transistor, symbol 2 represents a diode, symbol 3 represents a resistor, and symbol 4 represents an LED.

6. Which of the following is a correct definition of the term rectification?

A. Rectification is the opposition to current flow in a circuit.
B. Rectification involves sensing an electrical quantity and converting it to a signal.

C. Rectification is the conversion of AC current to DC current.

D. Rectification refers to the connection of components into a circuit.

FIGURE A-2—Use this illustration to answer
Questions 7–10.

7. Look at the simple circuit illustrated in Figure A-2. What will happen when only switch S1 is closed?

A. The light bulb will light up.
B. Current will flow in the circuit.

C. The resistance of the circuit will increase.

D. Nothing will happen—the light bulb won't light up.

8. In the circuit shown in Figure A-2, what will happen when switches S1 and S3 are both closed?

A. The light bulb will light up.
B. Current will flow in the circuit.

C. The resistance of the circuit will increase.

D. Nothing will happen—the light bulb won't light up.

9. In the circuit shown in Figure A-2, what will happen when switches S2 and S3 are both closed?

A. The light bulb will light up.
B. Current will flow in the circuit.

C. The resistance of the circuit will increase.

D. Nothing will happen—the light bulb won't light up.

10. In the circuit shown in Figure A-2, which switches must be closed in order for the light bulb to light up?

A. Only switch S1 needs to be closed in order for the light bulb to light up.
B. Only switches S1 and S2 need to be closed in order for the light bulb to light up.

C. Only switches S1 and S3 need to be closed in order for the light bulb to light up.

D. Only switches S2 and S3 need to be closed in order for the light bulb to light up.

11. At a job interview, the most effective way to prove your proficiency to a prospective employer is to show that you have

A. membership in several professional organizations.
B. certification as an electronics technician.

C. experience with on-line research.

D. your own test equipment.

12. Which one of the following letters is used as an abbreviation when representing a unit of electric current?

A. E
B. R

C. C

D. A

FIGURE A-3—Use this illustration to answer Question 13.

13. Safety is a concern around electronic equipment of all types. When you see the sign and the symbol shown in Figure A-3, what particular safety hazard may exist?

A. High voltage
B. Laser light

C. Delicate equipment

D. Radioactivity

14. Which of the following statements about light-emitting diodes is correct?

A. Light-emitting diodes conduct current in either direction in circuits.
B. Light-emitting diodes are used as indicators in circuits.

C. Light-emitting diodes have very short life-spans in circuits.

D. Light-emitting diodes are used

1. When electric current is flowing in a circuit, if the voltage applied to the circuit is increased,

A. the resistance will increase.
B. the current will increase.
C. the resistance will decrease.
D. the current will decrease.

2. Which of the following information sources will not be directly affected by the Telecommunications Act of 1996?

A. Telephone services
B. The Internet
C. Newspaper publishing
D. Cable television

3. Porcelain, paper, glass, and rubber are all examples of electrical

A. conductors.
B. batteries.
C. insulators.
D. grounds.

4. A testing instrument that an electronics technician will connect to selected points inside a piece of electronic equipment and measure electrical values such as ohms, volts, and amperes is called

A. a signal generator.
B. a power supply.
C. an oscilloscope.
D. a multimeter.

When electric current is flowing in a circuit, if the voltage applied to the circuit is increased,
A. the resistance will increase.
B. the current will increase.
C. the resistance will decrease.
D. the current will decrease.

2. Which of the following information sources will not be directly affected by the Telecommunications Act of 1996?
A. Telephone services
B. The Internet
C. Newspaper publishing
D. Cable television

3. Porcelain, paper, glass, and rubber are all examples of electrical
A. conductors.
B. batteries.
C. insulators.
D. grounds.

4. A testing instrument that an electronics technician will connect to selected points inside a piece of electronic equipment and measure electrical values such as ohms, volts, and amperes is called
A. a signal generator.
B. a power supply.
C. an oscilloscope.
D. a multimeter.

FIGURE A-1—Use this illustration to answer Question 5.

5. Look at the four schematic symbols shown in Figure A-1. Each of the symbols is labeled with a number. Which of the following statements about these symbols is correct?
A. Symbol 1 represents a diode, symbol 2 represents a resistor, symbol 3 represents an LED, and symbol 4 represents a transistor.
B. Symbol 1 represents a diode, symbol 2 represents an LED, symbol 3 represents a transistor, and symbol 4 represents a resistor.
C. Symbol 1 represents a transistor, symbol 2 represents a resistor, symbol 3 represents an LED, and symbol 4 represents a diode.
D. Symbol 1 represents a transistor, symbol 2 represents a diode, symbol 3 represents a resistor, and symbol 4 represents an LED.

6. Which of the following is a correct definition of the term rectification?
A. Rectification is the opposition to current flow in a circuit.
B. Rectification involves sensing an electrical quantity and converting it to a signal.
C. Rectification is the conversion of AC current to DC current.
D. Rectification refers to the connection of components into a circuit.

FIGURE A-2—Use this illustration to answer
Questions 7–10.

7. Look at the simple circuit illustrated in Figure A-2. What will happen when only switch S1 is closed?
A. The light bulb will light up.
B. Current will flow in the circuit.
C. The resistance of the circuit will increase.
D. Nothing will happen—the light bulb won’t light up.

8. In the circuit shown in Figure A-2, what will happen when switches S1 and S3 are both closed?
A. The light bulb will light up.
B. Current will flow in the circuit.
C. The resistance of the circuit will increase.
D. Nothing will happen—the light bulb won’t light up.

9. In the circuit shown in Figure A-2, what will happen when switches S2 and S3 are both closed?
A. The light bulb will light up.
B. Current will flow in the circuit.
C. The resistance of the circuit will increase.
D. Nothing will happen—the light bulb won’t light up.

10. In the circuit shown in Figure A-2, which switches must be closed in order for the light bulb to light up?
A. Only switch S1 needs to be closed in order for the light bulb to light up.
B. Only switches S1 and S2 need to be closed in order for the light bulb to light up.
C. Only switches S1 and S3 need to be closed in order for the light bulb to light up.
D. Only switches S2 and S3 need to be closed in order for the light bulb to light up.

11. At a job interview, the most effective way to prove your proficiency to a prospective employer is to show that you have
A. membership in several professional organizations.
B. certification as an electronics technician.
C. experience with on-line research.
D. your own test equipment.

12. Which one of the following letters is used as an abbreviation when representing a unit of electric current?
A. E
B. R
C. C
D. A

FIGURE A-3—Use this illustration to answer Question 13.

13. Safety is a concern around electronic equipment of all types. When you see the sign and the symbol shown in Figure A-3, what particular safety hazard may exist?
A. High voltage
B. Laser light
C. Delicate equipment
D. Radioactivity

14. Which of the following statements about light-emitting diodes is correct?
A. Light-emitting diodes conduct current in either direction in circuits.
B. Light-emitting diodes are used as indicators in circuits.
C. Light-emitting diodes have very short life-spans in circuits.
D. Light-emitting diodes are used as rectifiers in circuits.

15. On a printed circuit board, electronic components will be mounted
A. from the substrate side of the board.
B. from the side of the board that contains the conducting paths.

1. If the current through a heater coil is 5 amp and the supply voltage is 120 volts, the coil resistance is
A. 0.04 ohm.
B. 24 ohms.
C. 110 ohms.
D. 575 ohms.

2. The amount of current flowing in a circuit can be measured by
A. an ammeter.
B. a voltmeter.
C. a neon test lamp.
D. an ohmmeter.

3. Which one of the following letters is used in formulas as the symbol for voltage?
A. P
B. W
C. I
D. E

4. The conductors in electrical devices are commonly made of
A. iron.
B. nickel.
C. copper.
D. lead.

5. The energy used by an appliance which operates at 240 volts at 15 amp for 4 hr. is
A. 0.92 kwhr.
B. 3.45 kwhr.
C. 14.4 kwhr.
D. 60.0 kwhr.

6. What is the voltage in a circuit with a resistance of 12 ohms and a current of 20 amp?
A. 0.58 volt
B. 1.74 volts
C. 120 volts
D. 240 volts

7. If an appliance does NOT work at all when you plug it in and turn the switch on, the appliance circuit is
A. shorted.
B. overloaded.
C. leaking.
D. open.

8. To read the line voltage supplied to an appliance, you should connect the voltmeter
A. in series with the power supply.
B. between the grounded wire and the water pipe.
C. across the power supply.
D. between terminals of two adjacent circuit parts.

9. The best method for testing the continuity of each part of an appliance uses
A. a voltmeter.
B. an ammeter.
C. an ohmmeter.
D. a wattmeter.

10. A 2000-watt heater connected to a 120-volt circuit will draw a current of
A. 5.75 amp.
B. 15 amp.
C. 16.67 amp.
D. 23 amp.

11. What type of fault causes an appliance to blow a fuse when the appliance is turned on?
A. An open circuit
B. Too much resistance
C. A short circuit
D. Too high a voltage

12. Which one of the following conditions is unfavorable for the use of an ohmmeter?
A. Voltage is supplied to the appliance
B. The appliance is grounded
C. Moisture is in the insulation
D. The appliance circuit is shorted

13. A series circuit in an appliance consists of
A. several branches carrying independent currents.
B. more than one part connected across the same terminals.
C. several parts connected end to end.
D. more than one path carrying the current.

14. Which one of the following components is used to change an AC voltage to a lower or higher value?
A. Transistor
B. Transformer
C. Capacitor
D. Resistor

15. A full-wave bridge rectifier uses how many diodes?
A. One
B. Two
C. Three
D. Four

16. An NPN transistor is correctly biased and turned on if the
A. base is negative.
B. collector is negative.
C. collector is positive with respect to the emitter and negative with respect to the base.
D. collector is the most positive lead followed by the base.

17. When an SCR turns ON, it acts like a(n)
A. transistor.
B. resistor and capacitor in series.
C. electronic switch and rectifier.
D. bridge rectifier.

18. Which one of the following IC digital gates requires a high on both inputs to output a high?
A. AND
B. OR
C. NAND
D. NOR

19. Which one of the following IC gates will have a low output if either of the inputs are high?
A. Buffer
B. NAND
C. NOR
D. OR

20. A microprocessor runs an internal program called a(n)
A. operating system.
B. scratchpad memory.
C. instruction chain.
D. PAL.

21. A resistor with the color bands brown, red, red and silver will have a resistance of
A. 120 ohms.
B. 1,200 ohms.
C. 2,100 ohms.
D. 6,400 ohms.

22. What type of diagram chart in a service manual can be used to easily service an electronic circuit board with ICs?
A. Exploded
B. Flowchart
C. Assembly
D. Pictorial

23. An LED display device uses how many segments to create the number 8?
A. Three
B. Four
C. Seven
D. Eight

24. When testing transistors, how much minimum voltage difference should be seen across the base-emitter junction?
A. 0.1 VDC
B. 0.4 VDC
C. 0.6 VDC
D. 0.9 VDC

25. When you are forward-bias testing a diode with a digital VOM, the red test lead should be placed on which lead of the diode?
A. Anode
B. Cathode
C. Emitter
D. Drain