Week 1, Chapter 1 - Principles of Electricity Flashcards

1
Q

The general name given to every substance in the physical universe is ________.

A

Matter

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2
Q

The smallest part of an element that retains all of its characteristics is ________.

A

Atom

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3
Q

The particles that orbit around the center of an atom are called ________.

A

Electrons

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4
Q

Electrons carry which type of charge; positive or negative?

A

Negative

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5
Q

Technician A says that electromagnetic induction is the production of electricity when a current is carried through a conductor and a magnetic field is produced. Technician B says current flowing through a conductor such as a copper wire creates a magnetic field surrounding the wire. Which technician is correct?

A

Both Technicians A and B

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6
Q

Which of the following methods can calculate circuit current?

a. Multiplying amps times ohms
b. Dividing ohms by volts
c. Dividing volts by ohms
d. Multiplying volts times watts

A

c. Dividing volts by ohms

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7
Q

What causes voltage drop in a circuit?

A

Increase in resistance

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8
Q

Which of the following is a measure of electrical current?

a. Amperes (Amps)
b. Ohms
c. Voltage
d. Watts

A

a. Amperes (Amps)

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9
Q

A material with many free electrons is a good ________.

A

Conductor

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10
Q

A material with FOUR electrons in the valence ring is a ________.

A

Semiconductor

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11
Q

The CONVENTIONAL (grandpa’s method) theory of current flow says that current flows from ________ to ________.

A

Positive, Negative

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12
Q

Voltage is which of these items?

a. Applied to a circuit
b. Flowing in a circuit
c. Built into a circuit
d. Flowing out of a circuit

A

a. Applied to a circuit

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13
Q

The unit that represents RESISTANCE to a current flow is ________.

A

Ohm

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14
Q

Which of the following characteristic does NOT affect resistance?

a. Diameter of the conductor
b. Temperature of the conductor
c. Atomic structure of the conductor
d. Direction of current flow in the conductor

A

d. Direction of current flow in the conductor

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15
Q

The sum of the voltage drops in a circuit equals ________.

A

Source voltage

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16
Q

Which of the following is a measure of electrical pressure?

a. Amperes (Amps)
b. Ohms
c. Voltage
d. Watts

A

c. Voltage

17
Q

Where E = volts, I = amperes, and R = resistance, how is Ohm’s law written?

A

E = I x R

18
Q

Capacitors are also called ________.

A

Condensers

19
Q

The lines of force of a magnet are called ________.

A

Flux lines

20
Q

The motor principle of changing electrical energy into mechanical energy requires two ________ carrying current in ________ direction(s).

A

Conductors, Opposite

21
Q

All of the following will increase voltage, except:

a. Increase the strength of the magnetic field
b. Increase the number of conductors cutting flux lines
c. Increase the angle between the flux lines and the conductor beyond 90 degrees
d. Increase the speed of the relative motion between the conductor and the flux lines.

A

c. Increase the angle between the flux lines and the conductor beyond 90 degrees.

22
Q

Diodes bring together what 2 types of material?

A

P type and N type

23
Q

Capacitors and Condensers are what type of device?

A

Energy storage

24
Q

Adding ________ to silicon to increase conductivity is known as ________.

A

Impurities, Doping

25
Q

For current to flow through a diode, the diode must have a ________ bias.

A

Forward

26
Q

In reference to magnetism, ________ attract and ________ repel.

A

Opposites, Likes

27
Q

The ratio of pulse width to signals period that is always expressed as a percentage is known as what?

A

Duty cycle

28
Q

The number of times a wave repeats per second is known as what?

A

Frequency

29
Q

Simply defined, ELECTRICITY is known as the ________ of ________.

A

Flow, Electrons

30
Q

For a diode to have forward bias, the “cathode” must face which direction?

A

Negative