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GRADE 12 ME > Q4: P6 L1&L2 > Flashcards

Q4: P6 L1&L2 Flashcards

1
Q

any motion of charge from one region to another

A

Current

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2
Q

movement of negative charges (electrons) opposite to the direction of the electric field.

A

Electron Flow

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3
Q

the average velocity reached by charged particles such as electrons, in a material due to an electric field.

A

Drift Velocity

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4
Q

behaves as if the positive charge carriers cause current flow

A

conventional Current

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5
Q

current per unit cross-sectional area

A

Current density

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6
Q

a conducting path that forms a closed loop in which charges move

A

Electric Circuit

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7
Q

in the direction of F (f arrow) will result from the charged particle moving in vacuum, in which after some time the charged particle would be moving in that direction at high speed

A

Steady Acceleration

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8
Q

The current and current density don’t depend on the ____of the charge

A

sign

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9
Q

the resistance to the flow of an electric current with some materials resisting the current flow more than others

A

Resistivity

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10
Q

depends on the material of which the object is composed

A

Resistance

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11
Q

restricts the amount of electrical current which flows

A

Amount of Resistance

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12
Q

unit for resistivity

A

Ohmsxmeter

resistance=ohms

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13
Q

have highest resistivities

A

Insulator

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14
Q

one of the factors wherein the electrical resistance between 2 points can depend on.

A

Conductor’s length

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15
Q

Relationship between resistance and length

A

directly p

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16
Q

Relationship between resistance and area

A

inversely p

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17
Q

An electric circuit is complete only when

A

there is at least one closed loop from the positive to the negative end

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18
Q

Current is the amount of ____ that passes a given ____ in a given amount of _____

A

amount of charge that passes a given point in a given amount of time.

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19
Q

An ______ in a conductor causes charges to flow

A

electric field

positive same direction
negative opposite to Ef

20
Q

Formula and unit for current

A

I=dQ/dt

C/s or Amp

21
Q

Total charge moving past a given point is given by

A

dQ=nqvdAdt

22
Q

formula for current given free electrons, drift velocity, and area

A

I=nqvdA

23
Q

Formula and unit for current density

A

J=I/A

Amperes per square meter (Amp/m^2)

24
Q

Good electrical conductors are often good ____ conductors, too

A

heat

25
Q

Ohms Law states that

A

when a voltage (V) source is applied between two points in a circuit, an electrical current (I) will flow between them encouraged by the presence of the potential difference between these two points

26
Q

The amount of electrical current which flows is restricted by ______

A

the amount of resistance (R) present.

27
Q

the______ encourages the current to flow (the movement of charge), but it is_______ that discourages it

A

voltage; resistance

28
Q

formula for Resistance

A

R=P(L/A)
Ohms

29
Q

The electrical resistance between two points can depend on many factors such as

A

conductor’s length
its cross-sectional area
the temperature
the actual material from which it is made.

30
Q

Ohms law tells us that for a given ______, the _____ flowing through the conductor is directly proportional to the _______

A

resistance,
current
applied voltage (I=V/R)

31
Q

By connecting 2 conductors together in a series combination, we have effectively doubled _____ and ____ while the _____ remains the same

A

length
resistance
Cross-sectional area

32
Q

by doubling the _____ and _____ of the conductor, to force the same current, we need to double the ________

A

length and resistance

applied voltage

33
Q

By connecting 2 conductors in a parallel combination, we have effectively doubled ______ while _____ remains the same . We halved the total _____

A

Area
Length
Resistance

34
Q

inverse of resistivity

A

electrical conductivity

35
Q

conductivity of a material is presented by

A

1/P or 1/resistivity

36
Q

Resistivity of metal vs resistivity of semiconductor in context of temp

A

metal - resistivity directly p to temp

semi - resistivity inversely p to temp

37
Q

formula for resistivity with temp

A

P=P0(1+aT)

38
Q

Formula for REsistance with temp

A

R=R0(1+aT)

39
Q

Ohmic vs non ohmic materials

A

OHMIC
- ohms law
- linear r with c and v
- good conductors
- constant temp

NON
- not linear
- semiconductors
- doesnt work with constant temp

40
Q

Ohms law states

A

that the current passing through a conductor is directly proportional to the voltage applied, provided that the temperature and other physical parameters remain constant.

41
Q

Ohms law formula

A

V=IR

42
Q

driving force of a device that keeps the constant flow of charges across circuit

A

Electromotive force

43
Q

Formula for Electromotive force

A

E=W/Q

E (v or volts)
W (j or joules)
Q (coulomb)

44
Q

work done to drive per unit charge across two points

A

electric potential difference

45
Q

EMF VS PD

A

EMF
- max potential difference between 2 electrodes; open circuit
- independent of resistance
- used for source of current
-cause

PD
- difference of potential between 2 points in closed circuit
- depends upon resistance between 2 points and current
- can be measured between any 2 points
- Effect

GRADE 12 ME (21 decks)

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