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Electrical Holy Shit > chapter 29 powerpoint > Flashcards

chapter 29 powerpoint Flashcards

1
Q

Electrical circuits range from simple to complex. Simple circuits may only have a _________, ________, and ________.

A

power supply, switch, and load

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2
Q

Power supply may be a DC, AC, DC to AC, or AC to DC power supply.

A

DC, AC, DC to AC, or AC to DC power supply.

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3
Q

any device that converts electrical energy to motion, heat, light, or sound.

A

Load

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4
Q

What are common examples of loads?

A

Common examples: heating coils, lamps, speakers, and motors

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5
Q

___________ and _________ affect electrical circuits differently than only _________.

A

Inductance (L)
capacitance (C)
resistance (R)

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6
Q

Resistance, inductance, and capacitance must all be considered when analyzing a circuit that is more than just a ________.

A

resistive load

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7
Q

A circuit that contains only resistive components, such as heating elements, and incandescent lamps.

A

resistive circuits

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8
Q

P=

A

E x I

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9
Q

I=

A

E / R

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10
Q

a material that has very little resistance and permits electrons to move through it easily.

A

Conductor

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11
Q

All electrical circuits use ________ to carry electricity to different parts of the circuit.

A

conductors

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12
Q

The resistance of any conductor with a uniform cross-sectional area is based on:

A
  1. Material Temperature
  2. Conductor Size
  3. Conductor Length
  4. Material
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13
Q

the resistance of a conductor having a specific length and cross-sectional area

A

Conductor Resistance

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14
Q

the property of a circuit that causes it to oppose a change in current due to energy stored in a magnetic field.

A

Inductance (L)

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15
Q

is the unit of inductance

A

Henry (H)

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16
Q

Henrys

A

(H)

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17
Q

Millihenrys

A

(mH)

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18
Q

Microhenrys

A

(μH)

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19
Q

The inductance in a coil is __ when the change in current is 1 A/sec and the induced voltage is 1 V.

A

1H

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20
Q

The amount of inductance produced by a coil depends on the strength of the ___________ produced by the coil.

A

magnetic field

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21
Q

Factors that determine a coil’s inductance include:

A
  1. Number of turns in the coil
  2. Length and spacing of the coil
  3. Core material and relative permeability of the core material
  4. Size of the wire used to make the coil.
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22
Q

Is added to fluorescent and HID lamp circuits to provide a high-voltage starting surge and limit current flow.

A

ballast

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23
Q

operate on the same basic electrical principles of magnetism as transformers

A

Inductors

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24
Q

Inductors

A

one coil

25
Q

Transformers

A

use two or more coils

26
Q

an inductor’s opposition to alternating current. Is measured in ohms
Depends on:
1. The amount of inductance (H) of the coil.
2. Frequency of the current

A

Inductive reactance (XL):

27
Q

is measured in ohms and can be determined when the values of inductance and frequency are known.

A

Inductive reactance

28
Q

The formula for determining inductance reactance is:

A

XL = 2πf L

29
Q

XL = 2πf L

XL =

A

inductive reactance in Ω

30
Q

XL = 2πf L

2π =

A

6.28 (indicates the circular motion that produces the AC sine wave)

31
Q

XL = 2πf L

f =

A

applied frequency in Hz

32
Q

XL = 2πf L

L=

A

inductance in H

33
Q

To calculate inductive reactance when voltage across a coil (EL) and current through a coil (IL) are known or measured:

A

XL = “EL” /”IL”

34
Q

XL = “EL” /”IL”

XL=

A

XL = inductive reactance in Ω

35
Q

XL = “EL” /”IL”

EL=

A

EL = voltage across coil in V

36
Q

XL = “EL” /”IL”

IL=

A

IL = current through coil in A

37
Q
  1. At zero frequency, there is no opposition due to inductance.
  2. A coil has low resistance and no inductive reactance
  3. Current flow through a coil connected to __ is limited only by the resistance of the wire.
A

DC resistance

38
Q

Inductance: Series Inductive Reactance
The inductive reactance of a circuit containing more than one coil is found by first determining the _________ of the circuit and then calculating the inductive reactance.

A

total inductance

39
Q

The total inductance in a circuit containing parallel-connected coils is less than the ___________.

A

smallest coil value

40
Q

The total inductance of two coils connected in parallel is found by applying the same formula for calculating the _______________connected din parallel.

A

the resistance of two loads

41
Q

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

A

Capacitance (C):

42
Q

an electric device specifically designed to store a charge of energy.

A

Capacitor:

43
Q

What is the unit for capacitators?

A

farad (F)

44
Q

Too large for most electrical/electronic applications. Normally stated in microfarads (μF) or picofarads (pF).

A

farad (F)

45
Q

The amount of capacitance a capacitor has is determined by:

A
  1. The area of the plates
  2. The spacing between the plates
  3. The dielectric used
  4. Connection arrangement
46
Q

a capacitor that has one value of capacitance.

A

Fixed capacitator

47
Q

a capacitor that varies in capacitance value.

A

Variable capacitator

48
Q

Current in a capacitor can only flow during the time period when the capacitor is either being ____________________.

A

charged or discharged

49
Q

A capacitor is created by separating strips of metal with a _____________________.

A

dielectric or insulating material

50
Q

the total opposition to the flow of alternating current that consists of any combination of resistance, inductive reactance, and capacitive reactance, is measured in ohms and may be substituted for resistance in Ohm’s law.

A

Impedance

51
Q

The capacitive reactance of capacitors connected in parallel is determined by ________________________________ .

A

calculating the total capacitance of the parallel-connected capacitors and using this value to calculate capacitive reactance

52
Q

Inductors and capacitors are electrical energy-storing devices that are used in AC and DC applications such as:

A 
Timing circuits
Surge protections
Filtering circuits
Fluorescent and HID lamp circuits
1Φ motors
Motor control circuits
And more!
53
Q

are small in size and have low capacitance ratings. Commonly range from pF to about 0.1 μF.

A

Mica capacitators

54
Q

Use wax paper or plastic film as the dielectric.

A

Paper capacitors

55
Q

Use ceramic as the dielectric. Can produce the same effect as a paper dielectric in less space.

A

Ceramic capacitors

56
Q

Use a paste as the dielectric,

provide more capacitance for their size than any other type of capacitors.

A

Electrolytic capacitors

57
Q

Normally use air or mylar as the dielectric and include movable and stationary metal plates.

A

Variable capacitors

58
Q

The charges on the plates of a capacitor reverse with each change in the applied voltage polarity when a capacitor is connected to an ______________.
The plates are alternately charged and discharged.

A

AC power supply

Electrical Holy Shit (13 decks)

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