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Midterms | Unit 2.3 Electromagnetism Flashcards

1
Q

He observed that a dissected frog leg twitched when touched by two different metals

A

Luigi Galvani (1700’s)

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2
Q

What were the 2 different metals used by Galvani in observing a dissected frog’s leg?

A

Brass and Iron

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3
Q

He contributed to the development of battery

A

Alessandro Volta

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4
Q

Precursor of modern battery

A

Voltaic Pile

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5
Q

A copper-zinc plate like a Dagwood sandwich

A

Voltaic Pile

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6
Q

What are the modern batteries?

A

Carbon rod (+) & Zinc cylindrical can (-)

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7
Q

Any device that converts some form of energy directly into electric energy

A

Source of Electromotive Force

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8
Q

He demonstrated that electricity could be used to generate magnetic fields

A

HANS OERSTED (1820)

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9
Q

It determines the direction of the magnetic field

A

Right-Hand Rule

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10
Q

A coil of wire

A

Solenoid

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11
Q

A current-carrying coil of wire wrapped around an iron core

A

Electromagnet

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12
Q

Electromagnets intensify the —

A

Induced magnetic field

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13
Q

Advantage of an electromagnet

A

Magnetic field can be adjusted or turned on & off

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14
Q

An electric current is induced in a circuit if some part of that circuit is in a changing magnetic field

A

ELECTROMAGNETIC INDUCTION

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15
Q

Experiments under ELECTROMAGNETIC INDUCTION

A

Faraday and Oersted Experiment

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16
Q

He observed the current in a changing magnetic field

A

MICHAEL FARADAY

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17
Q

He described the first law of electromagnetic induction

A

MICHAEL FARADAY

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18
Q

Changing magnetic field induces current

A

MICHAEL FARADAY’S EXPERIMENT

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19
Q

Faraday’s Law
The magnitude of the induced current depends on four factors:

A
  1. Strength of the magnetic field
  2. Velocity of the magnetic field as it moves past the conductor
  3. Angle of the conductor to the magnetic field
  4. Number of turns in the conductor
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20
Q

Under Faraday’s experiment, this measures current

A

Ammeter

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21
Q

Moving or spinning charges induces a magnetic field

A

HANS OERSTED EXPERIMENT

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22
Q

Differentiate Faraday and Oersted’s experiments

A

Faraday: Magnetic field generates electricity

Oersted: Electricity generates a magnetic field

23
Q

Electromagnetic devices

A
  • Electric motor
  • Electric generator
  • Transformer (Step up; Step down)
  • Induction motor (Rotor; Stator)
24
Q

An electric current produces mechanical motion

A

ELECTRIC MOTOR

25
Q

Switches the direction of
current through the loop

A

Commutator Ring

26
Q

Mechanical motion produces an electric current

A

ELECTRIC GENERATOR

27
Q

It changes the intensity of alternating voltage & current

A

TRANSFORMER

28
Q

Transformer is only applicabke in —

29
Q

Turns ratio greater than 1

A

Step-up Transformer

30
Q

A type of motor used with x-rays tubes

A

Induction motor

31
Q

Induction motor powers the — of an x-ray tube

A

Rotating anode

32
Q

Rotating part of an electromagnetic induction motor that is ocated inside the glass enveloper

33
Q

Stationary coil windings (electromagnet) situated in the protective housing but outside the glass envelope

34
Q

Voltage and number of turns
are directly proportional

A

TRANSFORMER LAW

35
Q

Types of transformer

A
  • Closed-core transformer
  • Shell-type transformer
  • Autotransformer
36
Q

A square core of ferromagnetic materials built up of laminated layers of iron

A

Closed-core transformer

37
Q

Reduced energy losses caused by eddy current

A

Closed-core transformer

38
Q

Has two-closed core

A

Shell-type transformer

39
Q

Confines more of the magnet field lines

A

Shell-type transformer

40
Q

More efficient than closed-core

A

Shell-type transformer

41
Q

Consists of one winding and one core

A

Autotransformer

42
Q

Autotransformer is a — transformer

43
Q

Where is the autotransformer located?

A

Located in the operating console

44
Q

What does the autotransformer control?

A

controls the kVp

45
Q

Function of electric circuit elements

  • Inhibits flow of electron
46
Q

Function of electric circuit elements

  • Provides electric potential
47
Q

Function of electric circuit elements

  • Momentarily stores electric charge
48
Q

Function of electric circuit elements

  • Measures electric voltage
49
Q

Function of electric circuit elements

  • Measures electric potential
50
Q

Function of electric circuit elements

  • Turns circuit on and off by providing infinite resistance
51
Q

Function of electric circuit elements

Increases & decreases voltage by fixed amount (AC only)

A

Transformer

52
Q

Function of electric circuit elements

  • Variable resistor
53
Q

Circuit elements

A

Resistor
Battery
Capacitor
Ammeter
Voltmeter
Switch
Transformer
Rheostat
Diode
(DRCRABSTV)

113 (18 decks)

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