Installer Conventional

(-25) + (42) + (-62) + (20) =

-25

(17) x (-19) =

-323

8.13 X 0.123 =

0.99999

How many ohms is the amount of resistance that allows 1 ampere of current to flow when 1 volt of electromotive force is applied to a circuit?

1

7 3/8 ÷ 7 1/4 =

1 1/58

3 6/9+6 1/3+9 5/9=

19 5/9

Which of the following metals has the greatest conductance?

Silver

Which of the statements is true of axioms?

When A = C and B = C, then A = B because both are equal to C, which supports the axiom: Quantities equal to the same quantity are equal to each other.

Which of the following best describes normal current flow?

When conductors are correctly connected, there is a complete current path.

250 × 10(-6) - 7 × 10(-5) =

180 × 10(-6)

75 × 10(3) + 25 × 10(4) =

32.5 × 10(4)

83 × 10(6) + 27 × 10(7) =

353 × 10(6)

0.00004 = ______ x 10 to the power of ______?

4, -5

What is 5 kV equivalent to?

5000v

-49 ÷ -7=

7

480 × 10(-5) divided by 60 × 10(-3) =

8 × 10(-2)

Which of the following is the correct definition for a type of circuit graphic?

A block diagram is a simplified outline of an electrical system that shows circuits or parts as rectangles and other shapes.

How is electric current produced?

From the transfer of energy from valence electron to valence electron because of applied charges.

Simplify and solve the equation: If E = IR, then I =?

E/R

What best describes the type of electron flow called random drift?

Electrons that change orbits in a random manner, resulting in no charge.

(-17) - (-34) =

17

What is the effective speed of electric current?

186,000 miles per second.

What is the total direct current (DC) loop resistance of a 350-foot piece of Series 59 drop cable when the DC loop resistance of that Series 59 cable is 56.04 ohms per 1,000 feet?

19.614 ohms.

What is the total DCDirect current loop resistance of a 1,850-foot piece of 0.500-inch coaxial cable with a DC loop resistance of 1.34 ohms per 1,000 feet?

2.479 ohms.

(10 × 10E3) + (26 × 10E4 )=

270 × 10E3

(20) ÷ (-4) + (-2) x (-10) - (-2) x (7) =

29

0.5349 ÷ 0.1420=

3.7669014

67.84 + 81.786 + 4281.98 =

4,431.606

What is the square of 7?

49

What is the square root of 81?

9

Which of the following best describes a schematic diagram?

A diagram showing the electrical connections of the components or devices in a circuit.

What are the three basic elements of an electrical circuit?

A power source, a load, and the connecting conductors.

Magnetic poles that are ___________ will ____________ each other when those poles are near each other.?

Alike, repel.

What determines the strength of an electromagnetic field?

An electromagnetic field is determined by the magnitude of the mmf

Why are some materials magnetic while others are not?

Because in most materials, half of the electrons in each atom spin in one direction while the other half of electrons spin in the opposite direction, canceling each other, which results in no creation of a magnetic field for the atom.

Which of the following best describes a conductor?

Elements that have a small number of electrons in the valence shell.

Which of the following best describes current?

Excessive flow for a specific conductor size can cause the conductor to become too hot and melt or burn the conductor's insulating cover.

Which of the following is one of the five basic rules that flux lines follow?

Flux lines always curve around through the body of the magnet to form complete loops.

Which of the following protects a circuit from excessive current flow?

Fuse

What does the left-hand rule for electromagnetism in a wire state?

If you wrap the fingers of your left hand around the wire with your thumb pointing in the direction of the current flow, your fingers will be wrapped in the direction of the magnetic field.

Elements without the production or movement of free electrons are considered?

Insulators.

Which of the following is true about a permanent-magnet loudspeaker?

It has a cone that moves back and forth in relation to the varying current of the original sound.

Which of the following best describes total resistance in a circuit?

It is the sum of the individual resistances in the circuit.

What happens when the cross-sectional area of a conductor doubles?

Its resistance decreases to half its original value.

Which of the following best describes load resistance?

Load resistance is the total resistance when the source and wire resistances are very small.

Which of the following is true about magnetism?

Magnetism was discovered when the Greeks noticed that certain stones attract iron.

Which circuit condition is one in which no current is allowed to flow?

Open Circuit

Which of the following best describes the power source in a circuit?

Provides a difference of potential.

How can an installer control the resistance of the drop cable being installed at a customer's premises?

Replace Series 59 with Series 6 cable because the Series 6 cable center conductor is larger in diameter, with lower resistance than Series 59 cable.

Which term best describes the opposition a material or device offers to the current flow?

Resistance

What does current flow encounter within a power source when traveling from the positive terminal to the negative terminal?

Source Resistance

What do you call a simple line design representing a component or device in a schematic diagram?

Symbol

What prevents the electrons that orbit an atom's nucleus at high speeds from breaking away from the nucleus due to centrifugal force?

The attraction between the positive nucleus and the negative electron.

Which of the following best describes the load in the electrical circuit?

The load is part of the electrical circuit that uses the electrical energy provided by the power source to carry out some desired function.

What happens in a magnetic material where some of the magnetic domains are pointing in the same direction?

The magnetic field is weaker.

Which of the following best describes the relationship between an ampere and a coulomb?

The number of amperes is equivalent to the number of coulombs passing a given point during one second.

Which orbital shell has a maximum electron capacity of 18 electrons?

The third shell.

Why are semiconductor materials not good conductors nor good insulators?

The valence shell isn't a factor in conducting nor insulating.

Which of the following is true when talking about the overall magnetic field?

When created by a straight piece of wire, the overall magnetic field is weaker than that created by forming loops of wire.

What is another way to create an electromagnet besides stroking a piece of magnetic metal, such as a piece of iron with another magnet?

Wrap a coil of insulated wire around an iron bar and pass an electric current through the wire.