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ELET 1110 > ELET Ch1 > Flashcards

ELET Ch1 Flashcards

0
Q

Anything that has weight and occupies space.

A

Matter

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1
Q

Charge is measured in _______

A

Coulombs (C)

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2
Q

A substance that can’t be broken down into simpler substances

A

Element

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3
Q

Smallest particle of matter that retains the physical characteristics of an element

A

Atom

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4
Q

The simplest model of an atom.

The central core (nucleus) contains protons & neutrons.

Electrons revolve around the nucleus.

A

Bohr Model

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5
Q

Number of protons

A

Atomic number

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6
Q

Outtermost shell of an atom.

A

Valence shell

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7
Q

Force that causes two particles to be attracted to or repel from each other

A

Charge

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8
Q

An atom with a positive net charge

A

Positive ion

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9
Q

An atom with a negative net charge

A

Negative ion

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10
Q

An electron that isn’t bound to any particular atom.

It can neutralize a positive ion.

A

Free electron

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11
Q

The directed flow of charge through a conductor.

A

Current

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12
Q

Measurement for current

A

Charge per unit time

I=Q/t

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13
Q

True or False

Thermal energy (heat) is sufficient to free electrons in copper.

A

True

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14
Q

True or False

Free electron motion is random unless outside force is applied

A

True

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15
Q

I is the symbol for _____ and stands for ________.

A

Current.

Intensity.

16
Q

Q is the symbol for _______ and is measured in _________

A

Charge

Coulombs

17
Q

Represents the total charge of approximately 6.25x10^18 electrons

A

Coulomb (C)

18
Q

Unit of current and is equal to

1C/s or 1 Coulomb per second

A

1A Amphere

19
Q

Current that is unidirectional is known as _______

A

Direct Current (DC)

20
Q

Current that is bidirectional is known as _______

A

Alternating Current (AC)

21
Q

A difference in potential that generates a directed flow of a charge or current.

A

Voltage

22
Q

The unit of measurement for voltage.

It is the difference of potential energy that uses one joule of energy to move one Coulomb of charge.

1J/C=

A

Volt

23
Q

A measure of the ease which current will pass through a component.

A

Conductance (G)

G=1/R

R=Resistance

24
Q

Conductance is most commonly measured in _______

A

Siemens (S)

25
Q

Materials that provide little opposition to the flow of current.

Have few valence shell electrons

A

Conductors

26
Q

Materials that normally block current.

Normally have a complete valence shell.

A

Insulators

27
Q

Materials like graphite, silicone, or germanium that are neither good condurctors nor good insulators.

Half complete valence shells

A

Semiconductors

28
Q

The resistance of a specified volume of an element or compound

A

Resistivity

R= (resistivity) x (length/cross sectional area)

ELET 1110 (3 decks)

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