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Physics Review > part 4 > Flashcards

part 4 Flashcards

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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

A

electrons

25
Q

define naturally occuring magnets

A

materials in the earth, the earth itself

26
Q

define permanent magnets

A

artificially produced, charged in an electromagnetic field

27
Q

define electromagnets

A

wire wrapped around an iron core, a current is applied to create a magnetic field

28
Q

define dimagnetic materials

A

materials that are unaffected by a magnetic field

29
Q

define ferromagnetic materials

A

materials that are easily permanently magnetized

30
Q

paramagnetic materials

A

slightly attracted to a magnet and loosely influenced by an external magnetic field

31
Q

non magnetic materials can be made magnetic by ______

A

induction

32
Q

the si unit of magnetic field strength is

A

tesla

33
Q

a coil of wire carrying an electron flow is a

A

solenoid

34
Q

where would magnetic field be concentrated in a solenoid?

A

through the centre of the coil

35
Q

to increase that magnetic field one could wrap a coil around a material that is _________ such as _______ to create a device that is _______

A

ferromagnetic
iron
electromagnet

36
Q

remember that a key to inducing the flow of an electric current is ______ magnetic field

A

changing

37
Q

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

A

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
Q

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

A

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
Q

what is a generator

A

a device that converts mechanical energy to electrical energy

40
Q

what is a motor

A

a device that converts electrical energy to mechanical energy

41
Q

what is a transformer

A

transforms electric potential and currents into higher or lower intensities, proportional to the number of turns of primary and esconday coils

Physics Review (3 decks)

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