part 4 Flashcards

(41 cards)

1
Q

define electrical charge and its unit

A

1 coulomb = 6.3 x 10^18

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2
Q

define electrodynamics

A

the study of electric charges in motion

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3
Q

define electric power

what is it expressed in

A

electric current through a potential

expressed in watts

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4
Q

define electrostatics

A

the study of stationary electric charges

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5
Q

define a dipole

A

two poles

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6
Q

define electromagnetic induction

A

the production of a current by motion of a conductor through a magnetic field

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7
Q

define electrostatic induction

A

the redistribution of charge in an object caused by the influence of nearby charges

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8
Q

define magnetic domain

A

an accumulation of many atomic magnets with their dipoles aligned

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9
Q

define autotransformer

A

the iron core transformer with on winding

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10
Q

define electric potential

A

the energy that causes electrons to move in a conductor

measured in volts

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11
Q

describe an electromagnet

A

current carrying coil wrapped around a ferromagnetic core

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12
Q

explain how magnetic domains can make an object act like a magnet

A

when the magnet domains align the object is magnetized

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13
Q

what is an electric circuit?

A

when electrons flow is controlled by use of resistance and the conductor is made into a closed path

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14
Q

what is the relationship between electric resistance and electric current

A

inverse relationship

as resistance increases flow decreases and vice versa

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15
Q

differentiate between a series and parallel circuit

A

series - has elements connected in a line along the same conductor
parallel - circuit has bridging lines across conductors

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16
Q

differentiate between a direct and alternating current

A

direct current has flow in one direction along the conductor

alternating has flow that can change directions periodically

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17
Q

define volt

A

measure of electric potential

18
Q

define ampere

A

measure of electric current

19
Q

define ohm

A

measure of electric resisitance

20
Q

define watts

A

measure of electric power

21
Q

define hertz

A

the number of cycles per second

22
Q

a magnetic field is created by a _______ particle in ______

A

charged

motion

23
Q

the magnetic field of a charged particle is _________ to the motion of that particle

A

perpendicular

24
Q

the degreee of magnetism exhibited by a material is related to the number of _______in the outer shell

25
define naturally occuring magnets
materials in the earth, the earth itself
26
define permanent magnets
artificially produced, charged in an electromagnetic field
27
define electromagnets
wire wrapped around an iron core, a current is applied to create a magnetic field
28
define dimagnetic materials
materials that are unaffected by a magnetic field
29
define ferromagnetic materials
materials that are easily permanently magnetized
30
paramagnetic materials
slightly attracted to a magnet and loosely influenced by an external magnetic field
31
non magnetic materials can be made magnetic by ______
induction
32
the si unit of magnetic field strength is
tesla
33
a coil of wire carrying an electron flow is a
solenoid
34
where would magnetic field be concentrated in a solenoid?
through the centre of the coil
35
to increase that magnetic field one could wrap a coil around a material that is _________ such as _______ to create a device that is _______
ferromagnetic iron electromagnet
36
remember that a key to inducing the flow of an electric current is ______ magnetic field
changing
37
electric current can be induced by magnetic fields of changing intensity, either through self induction or mutual induction, what is the difference between the two
self - when a coil or solenoid induces a voltage by its own changing magnetic field mutual - when a current is induced in a second coil by supplying a varying magnetic field to a primary coil
38
in an xray tube we usually see an induction motor made up of 2 components a rotor with windings and stators what is the purpose of each one
rotors - rotate, it is a series of wire loops that have current induced by the stators stators - electromagnets that are energized in sequence to produce a changing magnetic field
39
what is a generator
a device that converts mechanical energy to electrical energy
40
what is a motor
a device that converts electrical energy to mechanical energy
41
what is a transformer
transforms electric potential and currents into higher or lower intensities, proportional to the number of turns of primary and esconday coils