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RadProd > Electricuity > Flashcards

Electricuity Flashcards

1
Q

________ is supplied to the X-ray imaging
system to be converted into electromagnetic
energy

A

Electric energy

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2
Q

It is sometimes used to mean “electrical”.

A

Electricity

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3
Q

Electricity is the presence and flow (movement) of?

A

of charge.

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4
Q

It is the set of phenomena associated with the presence and
motion of matter that has a property of electric charge.

A

Electricity

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5
Q

It is the basic property of matter carries by some elementary
particles

A

Electric charge

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6
Q

Two types of electric charge

A

positive and negative

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7
Q

are the smallest units of electric charge

A

electrons and protons

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8
Q

Like charges___, and unlike charges_____

A

repel and attract

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9
Q

What is the unit of charge?

A

Coulomb

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10
Q

The unit of charge is named after?

A

Charles Augustin de Coulomb (eminent
French Physicist)

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11
Q

1 coulomb = ?

A

6.24x10^18 electron charges

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12
Q

6.24x10^18 is equal to?

A

1 coulomb

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13
Q

The smallest unit of “free” charge known in nature is the charge of an _____ which has a magnitude of 1.602 x 10-19 C

A

electron or proton

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14
Q

magnitude of electron and proton

A

1.602 x 10^-19

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15
Q

Electric charges associated with electrons and protons have the same
magnitude but _____

A

opposite signs

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16
Q

law that states that “the electrical force
between two charged objects is
directly proportional to the product of
the quantity of charge on the objects
and inversely proportional to the
square of the separation distance
between the two objects”

A

Coulomb’s Law

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17
Q

Coulomb constant

A

9 x 10 ^9 Nm^2/C^2

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18
Q

a force that acts at a distance,
even when objects are not in contact
with one another

A

electrostatic force

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19
Q

provides a convenient graphical presentation of
the electric field in space

A

Electric field lines

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20
Q

The direction of the field
lines is radially_____ for
a positive charge

A

outward

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21
Q

The d i r e c t i o n o f t h e field
lines is radially____ for a
negative charge

A

inward

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22
Q

Three Ways for a Neutral Object to be Charged

A
  1. Friction
  2. Conduction
  3. Induction
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23
Q

Occurs when two different
materials rub against each other
causing the transfer of electrons

A

Friction

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24
Q

is the opposing force
which acts in the opposite
direction of the movement of the
upper body

A

Friction

25
Q

Occurs when a neutral object is
placed in contact with an already-
charged object

A

Conduction

26
Q

a charged object is brought
near but not touched to a
neutral conducting object.

A

induction

27
Q

Four (4) Electric States of Matter

A

• Superconductor
• Conductor
• Semiconductor
• Insulator

28
Q

No resistance to electron flow, no
electric potential required, and must
be very cold

A

Superconductor

29
Q

The critical temperature usually
between absolute zero and 10 Kelvin

A

(-273 Celsius and -263 Celsius or as
high as 125 Kelvin (-148 Celsius)

30
Q

are used in machines for nuclear
magnetic resonance (NMR) in
hospitals and in the orientation
of the beam of a particle
accelerator.

A

Superconductor

31
Q

is a
substance in which electrical
charge carriers (usually
electrons), move easily from
atom to atom with the
application of voltage

A

Conductor

32
Q

examples of conductor

A

copper aluminum

33
Q

• It is a material that does not
conduct electrical current

A

insulator

34
Q

examples of insulators

A

paper, plastic, rubber, and glass

35
Q

A solid substance that has a
conductivity between that of an
insulator and that of most metals

A

SemiConductor

36
Q

Devices made of semiconductors,
notably_____, are essential
components of most electronic
circuits.

A

silicon

37
Q

• It is defined as the electric potential energy, U , per unit charge

A

Electric Potential

38
Q

• Sometimes referred to as the voltage

A

Electric potential

39
Q

• The higher the voltage, the greater the ____

A

potential to do work

40
Q

• It is an electromotive force or potential difference expressed in volts

A

voltage

41
Q

• It is an electromotive force or potential difference expressed in volts

A
42
Q

The Volt unit is named after

A

Alessandro Volta

43
Q

an Italian
physicist who invented an electric battery

A

Alessandro Volta

44
Q

• 1 V =

A

1 J/C

45
Q

• It is the rate of flow of electrons in a wire.

A

Electric current

46
Q

SI Unit of voltage

A

volts

47
Q

SI Unit of electric current

A

Ampere (A)

48
Q

Electric current -SI Unit is Ampere (A) which was named after

A

Andre Marie Ampere

49
Q

1 A is the flow of electric charge across a surface at the rate of

A

1 C/s

50
Q

It is a measure of opposition to the flow of electric current

A

Electric resistance

51
Q

SI unit of Electric resistance

A

Ohm (Ω)

52
Q

Electric resistance-The SI unit is Ohm (Ω), named after a German physicist and
mathematician,

A

Georg Simon Ohm

53
Q

“The amount of electric current through a metal conductor
in a circuit is directly proportional to the voltage applied
across it and inversely proportional to the resistance”

A

Ohm’s Law

54
Q

is a measure of energy per unit time.

A

Power

55
Q

gives the rate of energy consumption or production.

A

Power

56
Q

The units for power are generally

A

watts (W).

57
Q

The amount of electrical energy transferred to a device depends on its _____ and the ____.

A

its power and the length of time it is switched on.

58
Q

Electric energy is measured in

A

kilowatt-hours, kWh

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