Q4: P6 L1&L2

Question 1

any motion of charge from one region to another

Answer 1

Current

Question 2

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

Answer 2

Electron Flow

Question 3

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

Answer 3

Drift Velocity

Question 4

behaves as if the positive charge carriers cause current flow

Answer 4

conventional Current

Question 5

current per unit cross-sectional area

Answer 5

Current density

Question 6

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

Answer 6

Electric Circuit

Question 7

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

Answer 7

Steady Acceleration

Question 8

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

Answer 8

sign

Question 9

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

Answer 9

Resistivity

Question 10

depends on the material of which the object is composed

Answer 10

Resistance

Question 11

restricts the amount of electrical current which flows

Answer 11

Amount of Resistance

Question 12

unit for resistivity

Answer 12

Ohmsxmeter

resistance=ohms

Question 13

have highest resistivities

Answer 13

Insulator

Question 14

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

Answer 14

Conductor’s length

Question 15

Relationship between resistance and length

Answer 15

directly p

Question 16

Relationship between resistance and area

Answer 16

inversely p

Question 17

An electric circuit is complete only when

Answer 17

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

Question 18

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

Answer 18

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

Question 19

An ______ in a conductor causes charges to flow

Answer 19

electric field

positive same direction
negative opposite to Ef

Question 20

Formula and unit for current

Answer 20

I=dQ/dt

C/s or Amp

Question 21

Total charge moving past a given point is given by

Answer 21

dQ=nqvdAdt

Question 22

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

Answer 22

I=nqvdA

Question 23

Formula and unit for current density

Answer 23

J=I/A

Amperes per square meter (Amp/m^2)

Question 24

Good electrical conductors are often good ____ conductors, too

Answer 24

heat

Question 25

Ohms Law states that

Answer 25

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

Question 26

The amount of electrical current which flows is restricted by ______

Answer 26

the amount of resistance (R) present.

Question 27

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

Answer 27

voltage; resistance

Question 28

formula for Resistance

Answer 28

R=P(L/A) Ohms

Question 29

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

Answer 29

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

Question 30

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

Answer 30

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

Question 31

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

Answer 31

length resistance Cross-sectional area

Question 32

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

Answer 32

length and resistance applied voltage

Question 33

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

Answer 33

Area Length Resistance

Question 34

inverse of resistivity

Answer 34

electrical conductivity

Question 35

conductivity of a material is presented by

Answer 35

1/P or 1/resistivity

Question 36

Resistivity of metal vs resistivity of semiconductor in context of temp

Answer 36

metal - resistivity directly p to temp semi - resistivity inversely p to temp

Question 37

formula for resistivity with temp

Answer 37

P=P0(1+aT)

Question 38

Formula for REsistance with temp

Answer 38

R=R0(1+aT)

Question 39

Ohmic vs non ohmic materials

Answer 39

OHMIC - ohms law - linear r with c and v - good conductors - constant temp NON - not linear - semiconductors - doesnt work with constant temp

Question 40

Ohms law states

Answer 40

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

Question 41

Ohms law formula

Answer 41

V=IR

Question 42

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

Answer 42

Electromotive force

Question 43

Formula for Electromotive force

Answer 43

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

Question 44

work done to drive per unit charge across two points

Answer 44

electric potential difference

Question 45

EMF VS PD

Answer 45

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