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Electronics > Section 1 > Flashcards

Section 1 Flashcards

1
Q

Another name for insulator

A

Dielectric

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2
Q

The atomic number of an element

A

Gives the number of protons in the nucleus of the atom, balanced by an equal number of orbital electrons.

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3
Q

The goal of valance for electrons

A

Is 8 with the exception of H and He

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4
Q

One coulomb is a quantity of electricity corresponding to…

A

6.25 x 10^18 electrons or protons.

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5
Q

The symbol for charge…

A

Q

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6
Q

Voltage is known as…

A

Potential difference - it is a measurement of electric “pressure” or “force” that exists between two points.

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7
Q

The unit of potential difference is the…

A

Volt

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8
Q

How do you calculate voltage?

A

Voltage is equal to Watts divided by Charge

V= W/Q

1V = 1J / 1C

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9
Q

Current is…

A

The rate of movement of electric charge

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10
Q

The symbol for current is…

A

I

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11
Q

The basic unit of measurement for current…

A

Ampere

1A = 1Q/1C

I = Q/T

Current is equal to charge divided by time.

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12
Q

Resistance is…

A

Opposition to the flow of current

Symbol of resistance is: R

Basic unit of measurement is the ohm

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13
Q

Conductance is…

A

the reciprocal of resistance.

The symbol for conductance is: G

The basic unit of measurement is the Siemens (S)

R =1/G and G=1/R

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14
Q

An electric current is…

A

A closed path for current flow. A voltage must be connected across a circuit to produce current flow.

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15
Q

Conventional current

A

Is a motion of positive charges in the opposite direction of electron flow

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16
Q

Voltage can exist without current but current cannot exist without voltage

A

True

17
Q

The most common types of resistors

A 
Carbon-composition
Carbon film
Metal film
Wire wound
Surface mount
Chip resistors
18
Q

Carbon-film and metal-film resistors are better than carbon-composition resistors because…

A

They have tighter tolerances

Are less affected by temperature and aging

Generate less noise internally

19
Q

A thermistor is…

A

A thermally sensitive resistor whose resistance value changes with temperature. If the resistance of a thermistor increases with temperature it is said to have a positive temperature coefficient (PTC). If the resistance of a thermistor decreases with temperature, it is said to have a negative temperature coefficient (NTC).

20
Q

Wire-wound resistors are usually used in

A

High current applications of ratings between 1W and 100W

21
Q

What is a potentiometer?

A

A variable resistor with three terminals used to vary the voltage in a circuit.

22
Q

A rheostate is…

A

A variable resistor with two terminals used to carry the current in a circuit.

23
Q

The physical size of a resistor determines its wattage rating…

A

The larger the physical size, the larger the wattage rating.

24
Q

There is no correlation between a resistors physical size and its…

A

Resistance value

25
Q

The most common trouble in resistors is an open…

A

An ohmmeter across the leads of an open resistor will read infinite, assuming there is no other parallel path across the resistor.

26
Q

What are the 3 forms of ohms law?

A

I = V/R
V= I(R)
R=V/I

27
Q

One ampere is…

A

The amount of current produced by one volt of potential difference across one ohm of resistance. The current of 1A is the same as 1C/s

28
Q

POWER is…

A

The time rating of doing work or using energy.

The unit of measurement is: The watt

1V x 1A = 1watt

Watts = joules per second

29
Q

The unit of work or energy is…

A

The joule

1 joule = 1 watt x 1 second

30
Q

An open circuit has no current and…

A

Infinitely high R.

Electronics (1 decks)

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