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Electrical Theory [FINALIZED!] > [D2L] Midterm > Flashcards

[D2L] Midterm Flashcards

1
Q

What is Voltage?

A

A difference in charge between 2 points

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2
Q

Common temporary magnets we use in HVAC are…

A

Contactors

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3
Q

When all magnetic moments align, what is produced?

A

Magnetic Domain

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4
Q

With the left hand rule, grabbing the conductor with your left hand what do your fingers wrapping around it represent?

A

Direction of magnetic force

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5
Q

What is the basic principle of a transformer?

A

Mutual Induction

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6
Q

How is self induction created?

A

EMF traveling in the opposite direction due to Impedance

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7
Q

How many current paths are there in a series circuit?

A

one

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8
Q

Thermocouples use heat to generate Electricity?

A

True

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9
Q

What is static electricity?

A

the buildup of electrical charge in an isolated object

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10
Q

How many electrons in a coulomb

A

6.28 x 10 exponent 18

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11
Q

What is the symbol for electrical Charge?

A

Q

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12
Q

If an atom gains free electrons it becomes a

A

Negative Ion

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13
Q

When a car battery is dead

A

The charge is equalized

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14
Q

What amount of current is enough to kill a person?

A

100 to 200 mA

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15
Q

What is Applied voltage?

A

The Source voltage

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16
Q

What is voltage drop?

A

a reduction in voltage due to an increase in current

17
Q

Which of the following is one way of stating Kirchhoff’s Voltage Law?

A

The algebraic sum of all voltages in a closed circuit is zero

18
Q

Switches are devices that consume electricity while performing an action

A

False, they are loads

19
Q

?What is Electromotive Force?

A

The energy used to move electrons away from atoms

20
Q

What is the purpose of a lockout system while working on electrical systems?

A

To prevent shocks and the accidental start-up of the equipment being serviced.

21
Q

What is electromagnetism?

A

The interaction of the forces that electric fields and magnetic fields create

22
Q

How is alternating current generated?

A

By spinning a coil of wire 120 times per second.

23
Q

When any force squeezes a crystals made from bone, wood, metal or minerals the material compresses and produces electricity, this is called…

A

Piezoelectricity

24
Q

Which of the following is NOT considered part of electrical PPE for the RACM trade?

a) class 0 insulated gloves
b) long sleeve polyester shirt
c) multimeter
d) safety glasses

A

long sleeve polyester shirt

25
Q

what is the FIRST thing that must be done if an electrical shock occurs?

A

remove the victim

26
Q

Kirchhoff’s Current Law states that in an electrical circuit, the sum of the currents entering a junction must equal the sum of the currents leaving the junction

T or F

A

True

27
Q

when illuminated, an incandescent light bulb will have a magnetic field close to the filament (glowing coil)?

A

True

28
Q

By winding a wire into a coil, an electromagnet with poles will be produced when current is passed through the wire?

A

True

29
Q

increasing the flow of current through a coil will..

A

increase the strength of the magnetic field

30
Q

the number of lines of magnetic flux may be increased by adding an iron core in the middle.

A

True

31
Q

A Megohmmeter (Megger) produces a _____ voltage output

A

High

32
Q

ferromagnetic materials, like iron, allow magnetic flux to pass through them easily because they have a high

A

permeability

33
Q

a material that does not allow easy passage of magnetic flux is said to have a high

A

reluctance

34
Q

the emf that is induced in a circuit by electromagnetism, is proportional to the rate of change of flux linkage. this statement could be used to summarize?

A

faraday’s law

35
Q

if the direction of current flow is reversed through a coil, the resulting magnetic field will..?

A

reverse direction

36
Q

a DC transformer is widely used to convert a dangerous high voltage power source to a safer and more usable control voltage?

A

False, Transformer is always AC

37
Q

passing a conductor in parallel to lines of flux will induce a current of electromotive force?

T or F

A

False

38
Q

an alternator converts…………………, into…………………… energy

A

mechanical, electrical

39
Q

in order to provide a useful low voltage control signal, a transformers primary and secondary coils should be in contact at each end of their conductors?

A

False, they should be isolated from each other

Electrical Theory [FINALIZED!] (18 decks)

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