Week 1, Chapter 1 - Principles of Electricity

Question 1

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

Answer 1

Matter

Question 2

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

Answer 2

Atom

Question 3

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

Answer 3

Electrons

Question 4

Electrons carry which type of charge; positive or negative?

Answer 4

Negative

Question 5

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?

Answer 5

Both Technicians A and B

Question 6

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

Answer 6

c. Dividing volts by ohms

Question 7

What causes voltage drop in a circuit?

Answer 7

Increase in resistance

Question 8

Which of the following is a measure of electrical current?

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

Answer 8

a. Amperes (Amps)

Question 9

A material with many free electrons is a good ________.

Answer 9

Conductor

Question 10

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

Answer 10

Semiconductor

Question 11

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

Answer 11

Positive, Negative

Question 12

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

Answer 12

a. Applied to a circuit

Question 13

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

Answer 13

Ohm

Question 14

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

Answer 14

d. Direction of current flow in the conductor

Question 15

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

Answer 15

Source voltage

Question 16

Which of the following is a measure of electrical pressure?

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

Answer 16

c. Voltage

Question 17

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

Answer 17

E = I x R

Question 18

Capacitors are also called ________.

Answer 18

Condensers

Question 19

The lines of force of a magnet are called ________.

Answer 19

Flux lines

Question 20

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

Answer 20

Conductors, Opposite

Question 21

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.

Answer 21

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

Question 22

Diodes bring together what 2 types of material?

Answer 22

P type and N type

Question 23

Capacitors and Condensers are what type of device?

Answer 23

Energy storage

Question 24

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

Answer 24

Impurities, Doping

Question 25

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

Answer 25

Forward

Question 26

In reference to magnetism, ________ attract and ________ repel.

Answer 26

Opposites, Likes

Question 27

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

Answer 27

Duty cycle

Question 28

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

Answer 28

Frequency

Question 29

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

Answer 29

Flow, Electrons

Question 30

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

Answer 30

Negative