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COLLEGE(2) MIDTERMS > RADPRO HUHU > Flashcards

RADPRO HUHU Flashcards

1
Q

is the science of stationary electric charges

A

Electrostatics

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2
Q

–is the science of electric charges in motion.

A

Electrodynamics

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3
Q

is a means of transferring electric potential energy from one position to another.

A

Electromagnetic induction

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4
Q

describes how electrons are given electric potential energy (voltage) and how electrons in motion create magnetism.

A

Electromagnetism

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5
Q

Electric energy is supplied to the x-ray imaging system in the form of well-controlled

A

electric current.

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6
Q

Electric charge comes in discrete units that

A

positive or negative

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6
Q

the smallest units of electric charge.

A

PROTON AND ELECTRON

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7
Q

1c is equal to hoy many columb

A

6.3 𝑥 1018 electron charges

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7
Q

Removal of these electrons electrifies the substances from which they were removed and results in

A

static electricity.

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7
Q

An object is said to be ____ if it has too few or too many electrons.

A

electrified

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8
Q

what law states that Like charges of electricity repel each other, whereas unlike charges attract each other.

A

1st

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9
Q

what law states The force exerted between two point charges is directly proportional to the product of their strengths

A

2

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10
Q

what law states The force exerted between two point charges is inversely proportional to the square of the distance between them.

A

3

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11
Q

what law states The force exerted between two point charges is inversely proportional to the absolute permittivity of the surrounding medium.

A

4

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11
Q

the direction of the energy field of a positive charge

A

outward

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12
Q

the direction of the energy field of a negative charge

A

inward

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13
Q

the force of attraction between unlike charges or repulsion between like charges is attributable to the electric field.

A

Electrostatic force

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14
Q

the electrostatic force is directly proportional to the product of the electrostatic charges and inversely proportional to the square of the distance between them.

A

Coulomb’s law

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15
Q

Coulomb’s constant: 𝑘

A

8.99 𝑥 109 𝑁 𝑚2/𝐶2

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16
Q

Electric potential is sometimes called

A

voltage

17
Q

higher the voltage, the greater is the potential to do work.

A

NOTE

18
Q

the electric potential in homes and offices IN PH

A

220 V

19
Q

If an electric potential is applied to objects such as copper wire, then electrons move along the wire.

A

electric current, or electricity

20
Q

any substance through which electrons flow easily.

A

Conductor

21
Q

any material that does not allow electron flow

A

Insulator

22
Q

material that under some conditions behaves as an insulator and in other conditions behaves as a conductor

A

Semiconductor

23
Q

EXAMPLE OF SEMICONDUCTOR

A

SILICON AND GERMANIUM

24
Q

is the property of some materials to exhibit no resistance below a critical temperature (Tc).

A

SUPERCONDUCTIVITY

25
Q

EXAMPLE OF SUPERCONDUCTIVITY

A

TITANIUM AND NIOBIUM

26
Q

When this resistance is controlled and the conductor is made into a closed path, the result is an

A

ELECTRIC CIRCUIT

27
Q

IN ELECTRICT CIRCUIT WHAT IS THE ROLE OF THE DIAMITER OF WIRE

A

the diameter determine the increase of electric current

27
Q

electric resistance is measured in

A

ohms

28
Q

Electric current is measured in

A

A ampere

29
Q

One ampere is equal to an electric charge of

A

1c

30
Q

The manner in which electric currents behave in an electric circuit is described by a relationship known

A

ohm’s law

31
Q

“The voltage across the total circuit or any portion of the circuit is equal to the current times the resistance.”

A

ohm’s law

32
Q

increase or decrease voltage

A

transformer

33
Q

allow electron to flow in one diection

A

diode

34
Q

all circuit elements are connected in a line along the same conductor.

A

Series circuit

35
Q

contains elements that are connected at their ends rather than lying in a line along a conductor

A

Parallel circuit

36
Q

Rules for Series Circuits resisttance

A

The total resistance is equal to the sum of the individual resistances

37
Q

Rules for Series Circuits current

A

The current through each circuit element is the same and is equal to the total circuit current.

38
Q

Rules for Series Circuits voltage

A

The sum of the voltages across each circuit element is equal to the total circuit voltage.

39
Q

Rules for Parallel Circuits current

A

The sum of the currents through each circuit element is equal to the total circuit current.

40
Q

Rules for Parallel Circuits resistance

A

The total resistance is the inverse of the sum of the reciprocals of each individual resistance.

40
Q

Rules for Parallel Circuits voltage

A

The voltage across each circuit element is the same and is equal to the total circuit voltage.

41
Q

Electrons flow first in a positive direction and then in a negative direction.

A

The waveform for AC

42
Q

Electric power is measured in

A

watts

43
Q

Light bulbs require W of electric power

A

30 to 150

COLLEGE(2) MIDTERMS (7 decks)

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