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Electrical/Electronics Theory > 190104A > Flashcards

190104A Flashcards

Electrical Theory

1
Q

What is an element?

A

material made of only one kind of atom

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2
Q

What charge do:
protons
neutrons
electrons
have?

A

positive
neutral
negative

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3
Q

When an atom gains an electron, it will have a ____ charge?

A

negative charge

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4
Q

when an atom loses an electron, it will have a _____ charge?

A

positive charge

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5
Q

What are valence electrons?

A

electrons in the outermost orbit of the atom

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6
Q

What are conductors?

A

material that allow electricity to pass through them

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7
Q

what law state that opposite charges attract each other?

A

columns law

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8
Q

What is voltage?

A

pressure/force causes electrons to flow

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9
Q

What is voltage defined as?

A

difference in electrical potential between two points

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10
Q

other names for voltage?

A

potential difference
electromotive force

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11
Q

sources of voltage or emf?

A

electrostatic, electromagnetic induction, electrochemical, photoelectric

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12
Q

when is voltage induced in a conductor electromagnetically?

A

any time a conductor moves at an angle of 90 degrees to a magnetic field

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13
Q

What is current?

A

amount of electron flow

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14
Q

what is the conventional theory?

A

current flows form positive to negative

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15
Q

what is electron theory?

A

electrons flow from negative to positive

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16
Q

what is resistance?

A

opposition to electron flowha

17
Q

what is a resistor?

A

a device used to offer resistance to electron flow

18
Q

what determines resistance?

A

cross sectional area
length
material
temperature

19
Q

how does a positive coefficient of resistance work?

A

temp increases, resistance increases

20
Q

what is a thermistor?

A

resistor that changes resistance based on temperature

21
Q

voltage and resistance determine?

A

current flow

22
Q

if voltage increases, ______ increases

A

current flow

23
Q

if resistance increases, current _____

A

decreases

24
Q

What is DC?

A

current flowing in one direction

25
Q

What is AC?

A

current that can flow in both directions

26
Q

What is the SI unit for AC?

A

hertz

Electrical/Electronics Theory (2 decks)

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