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Path Of Least Resistance > Current > Flashcards

Current Flashcards

0
Q

Compressor can only pump

A

Vapor or Gas

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1
Q

Current always takes the:

A

Path of least resistance

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2
Q

Draw a 6 term t-stat

A

Draw it

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3
Q

1st law of thermo dynamics:

A

Heat is energy;cannot be created or destroyed. you can only change it’s form

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4
Q

2nd law of thermodynamics:

A

Heat flows from a warmer to a cooler object.The greater the temp difference the faster heat will flow.

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5
Q

Draw Ohms law

A

E=I•R
I=E/R
R=E/I

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6
Q

Four components of a basic complete circuit are:

A

Source, path, load, return

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7
Q

All electrical switches:

A

Are shown in De-Energized position

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8
Q

All mechanical switches are shown in?

A

Are shown in normal operating position

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9
Q

Anywhere you pick up or lose voltage is either:

A
  1. Switch
  2. Load
  3. Or problem
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10
Q

All on one side is

A

0 volts

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11
Q

When using an ohm meter and you check voltage what will be the probable result?

A

Blow the fuse

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12
Q

T-stat unit diagnostics: Heat/Cool switch is in off position, Fan in On position if the indoor fan runs, this is what you will know:

A
  1. Line power Good
  2. Breaker Good
  3. Fuse Good
  4. Primary transformer Good
  5. Secondary transformer is Good
  6. IFR coil good
  7. IFR switch Good
  8. IFM Good
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13
Q

What do you Learn when you Ohm out the windings on a compressor?

A
  1. Common
  2. Run
  3. Start
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14
Q

When loads are wired in series:

A

The voltage is divided by the # of loads

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15
Q

When loads are wired in series:

A

The voltage is divided by the # of loads

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16
Q

Compressor Ohming:
A) greatest total resistance:
B) next greatest resistance:
C) least resistance:

A

A) R-S
B) C-S
C) C-R

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17
Q

3 phase do NOT have:

A

A Capacitor

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18
Q

Capacitors are only used in:

A

1 phase

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19
Q

Run capacitors helps —– — —— by giving —– ——

A

Start the engine by giving extra torque

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20
Q

Start capacitors can only be in the circuit for:

A

1-3 seconds

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21
Q

Holding relay is:

A

Any coil wired in series with it’s own switch.

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22
Q

What is the power formula for watts?

A

P = I • E

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23
Q

Fuses for inductive are:

A

Time delay or slow blown

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24
Q

Resistive loads are:

A

In start blow

25
Q

Fuses are designed to

A

Protect wiring

26
Q

How would you Ohm fuses to see if they are Good or Bad?

A

If the Ohms comes up as 0 ohms it’s Good; if it comes up as 240 ohms it is bad because they are on the same line & it is in series with the load.

27
Q

What types of overload resets are there?

A

Manuel reset automatic reset

28
Q

What is the proper way discharge capacitor?

A

2 watt 15,000-20,000 resister

29
Q

How to reverse a 3 phase Motor?

A

Change any two leads

30
Q

A/C equipment is set to work in what range?

A

10%

31
Q

What types of transformers are there?

A

Y and Delta

32
Q

What do transformers do?

A

Step up and step down

33
Q

What is a transient voltage?

A

Transient voltage can occur on the low voltage power circuits and can peek values in the many thousands of votes electrical storms even of miles away or they can be caused when a major load is added or dropped from the system examples of changes in the load could be an auto accident where a utility pole was damaged or a large piece of equipment starting or stopping

34
Q

How are capacitors rated?

A

Polarized non polarized and variable

35
Q

How many parts are in a motor?

A

Stator and rotor

36
Q

What advantages do 3 phase motors have over single phase motors?

A

They are easily reversible. The direction of rotation can be changed by interchanging any two supply voltage lines. They have higher efficiency.

36
Q

How is the speed of a motor determined?

A

The speed of a motor is determined by the number of stator coils and the hertz of the alternating current pg 591

37
Q

Describe the basic structure of an atom?

A

Atoms are made of small particles called protons, neutrons, and electrons. Protons are positively charged and electrons are negatively charged and neutrons have no charge.

38
Q

Explain the difference between alternating current A/C and direct current D/C?

A

Electron flow in one direction is called direct current. This type of current flow is used with battery powered devices. Alternating current reverses direction at regular intervals. A/C is used for power distribution because of it’s ability to be easily transformed to different voltage levels, allowing for high voltage transmission and reducing line loss.

39
Q

How are ECM’s built?

A

They consist of a motor and a control module. The rotor of the ECM is a permanent magnet, and the stator is wound like a 3 phase motor.

40
Q

What’s the difference between dual element fuse and one time fuse?

A

Dual element fuse is used for motor starting, one time fuse is a fuse with Little time delay in opening and little tolerance for surge current.

41
Q

How are length and diameters of screws given?

A

The length of the screw is given from the tip of the screw to the base of the head of the screw or level with the top of flat head screws

42
Q

An internal compressor overload is wired

A

In series with the common terminal

43
Q

What is the difference between a contactor and a motor starter?

A

The motor starter has built in overload protection

44
Q

Current is measured in what?

A

Amps

45
Q

Resistance is measured in what?

A

Ohms

46
Q

Electrical power is measured in what?

A

Watts

47
Q

What’s the diff between static electricity and dynamic electricity?

A

Dynamic:motion
Static:stationary

48
Q

What is the “Y” circuit for on T-stat?

A

Compressor contactor CC

49
Q

What are the three basic electric circuits?

A

Series, parallel, series-parallel

50
Q

What are the two common forms of electricity?

A

Chemical and magnetic

51
Q

In refrigerant cycle all heat transfer takes place at?

A

The point of saturation

52
Q

What is a. Energized circuit w/o a load?

A

A short

53
Q

Split phase motor centrifugal SW opens at what % of speed?

A

70-80% of normal operating speed

54
Q

What is the difference between the generator and an alternator?

A

Generator: wire windings spin inside a magnetic field
Alternator: magnetic field is spun inside the wire windings

55
Q

What does MSDS stand for?

A

Materiel safety data sheet

56
Q

What does PPE stand for?

A

Personal protective equipment

57
Q

What is the key for Ohming a multispeed motor?

A

0 ohms

58
Q

How does bi metal switch operate ?

A

Dissimilar metals expand & contract at different rates heat-cooled

59
Q

What are the basic components of a motor ?

A

Stator /rotor

Path Of Least Resistance (1 decks)

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