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electrical second year > D-1 1phase AC Circuits > Flashcards

D-1 1phase AC Circuits Flashcards

1
Q

What is a capacitor?

A

a device designed to store electrical charge (composed of 2 surfaces/metal plates separated by an insulating material called the dielectric

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2
Q

What unit is capacitance measured in?

A

farads (F)

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3
Q

What would happen if a capacitor was attached to a power supply?

A

the electrons would be unable to move and could not bridge the gap due to the insulating material. if the insulator was removed, an electrical discharge would occur

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4
Q

Why are capacitors used to stabilize a fluctuating power supply?

A

because if the voltage in the circuit drops, the capacitor will release charge to restore the voltage

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5
Q

The magnitude of voltage induced in a turn of wire is proportional to the rate of change of flux passing through that turn.

A

Faraday’s Law of electromagnetic induction

e=Blv

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6
Q

Fleming’s left hand rule

A

Thumb - Thrust
First finger - Flux Direction
Middle finger- Movement of electrons

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7
Q

The direction of the induced emf must be such that any current resulting from it will develop a flux that will oppose any changes in the original flux

A

Lenz’s Law

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8
Q

Mathematically how are inductors treated

A 
just like resistors 
in series A+B=C
in parallel (1/A)+(1/B)=(1/C)
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9
Q

Mathematically how are capacitors treated

A 
the opposite of resistors
in series (1/A)+(1/B)=(1/C)
in parallel A+B=C
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10
Q

ELI the ICEman?

A 
ELI = Inductor E leads I
ICE= Capacitor I leads E
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11
Q

Phase relationship between VXC and IXC in a capacitor?

A

IXC leads VXC by 90 degrees

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12
Q

Capacitance ( C ) is the property of an electric circuit that opposes a change in ?

A

Voltage

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13
Q

Basic capacitor consists of two ______ separated by an insulating material called the ______

A

Metal Plates, Dielectric

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14
Q

Factors that determine the amount of capacitance of a capacitor are?

A
  1. area of plates
  2. distance between plates
  3. different types of material as dielectric
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15
Q

Inductance ( L ) is the property of a circuit which opposes ?

A

a change in Current

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16
Q

What is the unit of measurement for Inductance ( L ) ?

A

Measured in Henry ( H )

17
Q

What are four factors that affect the Inductance of a coil?

A
  1. Number of Turns
  2. Permeability of core
  3. area of core
  4. Length of magnetic path
18
Q

an Inductor is more effective if the coils are wrapped around a ?

A

Iron Core

19
Q

a simple inductor or coil is made up of ?

A

Turns or Coils of wire

20
Q

If the number of turns on a coil is increased the Inductance will?

A

Increase

21
Q

If the core of a coil is replaced by one with a lower permeability the inductance will ?

A

decrease

22
Q

if the length of the magnetic path in the core of a coil is decreased the inductance will ?

A

Increase

23
Q

the ability of an insulating material to withstand high voltage without breakdown is know as

A

Dielectric Strength

24
Q

Capacitive Reactance (XC) is the opposition to the _____ in a ac circuit containing a capacitor?

A

Current

25
Q

Capacitive Reactance (XC) in measured in ?

A

Ohms

26
Q

Formula for XC ?

A

XC = (1) / (2)(pie)(f)(C)

27
Q

if the cross sectional area of the core is reduced the inductance of a coil will?

A

decrease

28
Q

What is Induction?

A

process by which a voltage is produced by the interaction of a conductor and a magnetic field

29
Q

what is faradays law?

A

the amount of induced emf is directly proportional to the rate of change of flux

30
Q

Mutual Induction is ?

A

the generation of an emf into one conductor or circuit by a change in flux around a separate conductor or circuit

31
Q

self induction is?

A

the generation of an emf in a conductor or circuit by a change of flux in the same circuit

32
Q

Factors effecting counter emf in a coil

A
  1. Inductance of the coil

2. rate of change of current in the coil

33
Q

Inductive Reactance ( XL ) is the ________ created by inductance in an ac circuit?

A

Opposition

34
Q

XL is measured in ?

A

Ohms

35
Q

Two factors affecting XL ?

A

Inductance

Frequency

36
Q

equation for XL?

A

XL = 2(pie)(f)(L)

37
Q

What is the relationship between iXL and VXL in a purely inductive circuit?

A

iXL lags Vxl by 90 degrees

electrical second year (9 decks)

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