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w.RADT 181: Fundamentals III > review doc > Flashcards

review doc Flashcards

1
Q

the type of current in which electrons alternate direction of flow as the electric potential switches back and forth

A

alternating current

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2
Q

The SI unit for current flow

A

Ampere (amp, A)

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3
Q

amount of charge per second, or how many electrons are flowing past a particular point in the current in 1 second

A

ampere

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4
Q

1 AMP (A) equals __________________

A

1 coulomb (C) flowing by in 1 second

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5
Q

The SI unit of measurement for frequency

A

Hertz

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6
Q

1 Hz is defined as ____________________

A

1 cycle per second

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7
Q

acts in the same manner as a fuse. If the current flowing through it rises above a certain level, the ____________ flips its internal switch to open the circuit and stop the electric flow.

A

circuit breaker

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8
Q

A metal or other substance with electrons that are free to produce a current

A

conductor

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9
Q

The SI unit equal to the electrical charge

A

Coulomb

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10
Q

how many electrons in a Coulomb?

A

of 6.25 x 10^18 electrons

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11
Q

C = _________

A

J/V

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12
Q

The SI unit of electromotive force

A

volts

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13
Q

measure the different potential energy that exists between one point and the other. This measures the energy potential that a given circuit can provide

A

volts

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14
Q

volts can also be seen as a ratio of ___________________________

A

potential energy to charge

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15
Q

The higher the voltage, the _______ electrical current will flow in the circuit. It is a measure of Potential Difference

A

more

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16
Q

A ________ is the amount of energy (in Joules) that an electrical device (such as a light) is burning per second that it’s running.

A

watt

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17
Q

1 Watt = ______

A

J/s

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18
Q

the force of attraction or repulsion acting along a straight line between two electric charges is directly proportional to the _____________________ and inversely to the ___________________________________

A

product of the charges, square of the distance between them

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19
Q

current is symbolized by (___) and measured in __________ (__).

A

(I), amps (A)

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20
Q

the quantity of electrons (“electrical charge”) flowing past a point in a circuit over a given time

A

current

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21
Q

The type of current that flows in only one direction

A

direct current

22
Q

batteries produce ____________

A

direct current

23
Q

The closed pathway of an electric current.

A

electric circuit

24
Q

The principles of electrical charges in motion

A

electrodynamics

25
Q

The principles of nonmoving electrical charges

A

electrostatics

26
Q

a section of special wire, usually encased in glass, that quickly melts if the current flowing through it rises too high

A

fuse

27
Q

Something that is able to absorb electrical charges

A

ground

28
Q

Any charged object can be neutralized if it is grounded as a positively charged object _________________ from the earth and negatively charged objects ______________________ to the earth until it is neutrally charged

A

will take on electrons, will give off electrons

29
Q

The condition of an object that has gained a charge through friction, contact, or induction

A

electrification

30
Q

A substance that does not conduct electric current because its electrons are bound within the molecules and cannot freely move

A

insulators

31
Q

The SI unit for resistance

A

Ohm (shown by omega Ω)

32
Q

V = ________________

A

IxR; current x resistance

33
Q

I = ________

A

V/R; voltage/resistance

34
Q

R = ________

A

V/I; voltage/current

35
Q

The ability of an element in a circuit to resist the flow of electricity by reducing or impeding it

A

resistance

36
Q

the amount of resistance of a conductor depends on four things

A

material, length, cross-sectional area, temperature

37
Q

resistant materials have _________________ (insulators) unlike good conducting materials (metals)

A

virtually no free electrons

38
Q

long conductor has (more/less) resistance

A

more

39
Q

A conductor with a large cross-sectional area will have (lower/higher) resistance because there is a greater external surface area on which the electrons can travel

A

lower

40
Q

in metallic conductors, temperature is _______________________ to resistance.

A

directly proportional

41
Q

as temperature increases, resistance _________

A

increases

42
Q

The energy of an object in motion

A

kinetic energy (KE)

43
Q

the energy that is possessed by an object due to its motion or due to its position

A

mechanical energy

44
Q

Mechanical energy can be ______________

A

either kinetic or potential

45
Q

Stored energy

A

potential energy (PE)

46
Q

The force of attraction between all the particles of a nucleus, both protons and neutrons

A

strong nuclear force

47
Q

the energy contained within a system that is responsible for its temperature

A

thermal energy

48
Q

__________ is the flow of thermal energy

A

heat

49
Q

the force needed to accelerate one kilogram of mass at the rate of one meter per second squared

A

newton

50
Q

1 N=_____________

A

1 kg(m/s2)

w.RADT 181: Fundamentals III (8 decks)

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