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Electricity 1 > Electricity I Midterm > Flashcards

Electricity I Midterm Flashcards

1
Q

What is the definition of base?

A

The repeated factor that is multiplied to obtain a power

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2
Q

What is the definition of element?

A

A substance that cannot be chemically broken down and contains atoms of only one variety

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3
Q

What is the definition of compound?

A

A combination of the atoms of two or more elements

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4
Q

What is the definition of atom?

A

The smallest particle that an element can be reduced to and still maintain the properties of that element

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5
Q

What is the definition of substance?

A

A fundamental or characteristic part or quality

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6
Q

What is Matter?

A

Anything that has mass and occupies space

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7
Q

What are the differences between a gas, a liquid, and a solid?

A

All are states of matter. Gas is a fluid with low density, and high compressibility. Liquid is a fluid with definite volume, but not shape. Solid has definite volume and shape.

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8
Q

What is metal is most often used in contacts?

A

Silver, has the highest conductivity of materials

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9
Q

What are the differences between peak, rms, average, and peak to peak values of sine waves?

A

Peak: max value of either positive or negitive alternation. RMS: effective, value produces same amt of heat in pure resistive circuit as a DC of same value (0.707 times peak value). Peak to Peak: value measured from max positive to max negative alternation

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10
Q

What is a code?

A

A regulation or minimum requirement

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11
Q

What are the differences between OSHA, NEMA, and ANSI?

A

OSHA: federal agency that requires all employers to provide a safe environment for their employees. NEMA: National Electrical Manufacturers Assoc. assists with info and standards for proper selections, ratings, constructions, testing, etc. ANSI: American National Standards Institute. National organization that helps identify industrial and public needs for standards

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12
Q

What are the features of a Class B helmet?

A

Protects agains high-voltage shock and burns, impact hazards, and penetration by falling or flying objects

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13
Q

What is the most visible result of an injury?

A

Blood

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14
Q

What are the states of matter?

A

Gas, liquid, solid

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15
Q

What units are used for capacitance?

A

Farads

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16
Q

What are the parts and characteristics of an atom?

A

Proton, neutron, electron

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17
Q

What is the definition of electricity?

A

The movement of electrons from atom to atom

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18
Q

What are the states of produced electricity?

A

Solar: solar power directly into DCE, hydroelectric, coal, nuclear, natural gas

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19
Q

What is the difference between conductors and insulators?

A

Conductor has very little resistance, allowing electrical flow easily (3 or less valence electrons). Insulator has high resistance, impeding electrical flow. (4 or more valence electrons)

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20
Q

What are potential and kinetic energy?

A

Potential energy is the stored energy a body has due to position, chemical state, or condition. Kinetic is energy of motion

21
Q

What is the proper name for voltage?

A

Electromotive Force (EMF)

22
Q

How many directions can DC Voltage travel?

A

1

23
Q

What is current measured in?

A

Amperage

24
Q

What are the basic characteristics of AC Voltage?

A

Reverses direction of flow at intervals

25
Q

What is a resistive circuit?

A

A circuit that only contains resistance (loads)

26
Q

What is an inductive circuit?

A

A circuit where current lags voltage

27
Q

What is a capacitive circuit?

A

A circuit where current leads voltage

28
Q

What is the relationship between current and voltage?

A

Voltage is the pressure that allows for current to flow

29
Q

What is the definition of inductance?

A

The property of an electric device that opposes a change in current due to its ability to store electrical energy in a magnetic field

30
Q

What is the definition of capacitance?

A

The ability of a component or circuit to store energy in the form of an electrical charge

31
Q

What is the definition of resistance?

A

The opposition to current flow

32
Q

Between inductance and capacitance, which leads and which lags on voltage?

A

Inductive Circuit: I lags E.

Capacitive Circuit: I leads E.

33
Q

What is power expressed in?

A

Watts

34
Q

What is the definition of Ohm’s law?

A

The relationship between voltage, current, and resistance in a circuit

35
Q

What does it mean to be grounded?

A

The connection of all exposed noncurrent-carrying metal parts to earth, via a low-resistance path

36
Q

How many paths exist in a series circuit?

A

1

37
Q

What is the definition of a parallel circuit?

A

A connection that has two or more components connected so that there is more than one path for current to flow

38
Q

What is always constant in a series circuit and a parallel circuit?

A

Series: Current, Parallel: Voltage

39
Q

What does total resistance do in a parallel circuit when loads are added?

A

Total resistance decreases as loads are added in parallel

40
Q

What is the definition of phase shift?

A

The state when voltage and current in a circuit do not reach their maximum amplitude and zero level simultaneously

41
Q

What is a standard?

A

An accepted reference or practice

42
Q

What are the different classes of fire estinguishers and what do each do?

A 
A: Ordinary combustibles
B: Flammable liquids
C: Electrical equipment
D: Combustible metals
K: Commercial cooking grease
43
Q

What are the minimum PPE for electrical work?

A

Gloves, fire retardant clothes, face-shield and goggles

44
Q

What is grounding and when should it be used?

A

A low-resistance conducting connection between electrical circuits, equipment, and the earth. Always

45
Q

Describe electrical enclosures and what their purpose is?

A

Housing that protects wires and equipment and prevents injury to personnel from accidental contact with a live circuit

46
Q

How do you calculate total capacitance in series and in parallel?

A

Ct = C1 x C2 / C1 + C2

47
Q

How do you calculate total inductance in series and in parallel?

A

P: Lt = L2 x L3 / L2 + L3.
S: Lt = L1 + L2 + etc.

48
Q

What is the OHM’s law formula?

A

E / I x R

49
Q

What is the Power formula?

A

P / E x I

Electricity 1 (2 decks)

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