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EK physics > Lecture 4 > Flashcards

Lecture 4 Flashcards

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1
Q

Coulombs Law

A

F= k (q1q2)/r^2

k = 9x10^9 N*m^2/C^2

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2
Q

Charge of 1 e

A

1.6 x 10^-19

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3
Q

Field

A

condition is space that creates a force on a charge

any force must be in contact except for gravity, electricity, and magnetism

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4
Q

Lines of force

A

represents field, point in direction of field (positive to negative)

distance between lines indicates strength of field (closer together means stronger field)

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5
Q

Electric field

A

E, electrostatic force per unit charge

E= k (q1/r^2)F

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6
Q

Force in electric field

A

Force on a charge q in electric field

F= qE

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7
Q

Potential energy of a charge

A

U= qEd

d- displacement

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8
Q

Voltage

A

potential for work by an electric field in moving any charge from one point to another

V=Ed

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9
Q

Voltage due to point charge

A

V= k (q1/r)

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10
Q

equipotential lines

A

movement perpendicular results in no change in potential

points are at same voltage

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11
Q

electric dipole

A

two opposite charges with equal magnitude

p=qd

points in direction opposite to the electric field

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12
Q

conductors

A

electrons flow freely

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13
Q

resistors

A

poor conductors, hold electrons tightly in place

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14
Q

current

A

moving charge, in amps or C/s

direction of movement of positive charge

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15
Q

What affects resistance

A

Increasing length of wire increases distance

increasing area (increasing radius) decreases resistance

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16
Q

Resistance

A

measure of an object of certain size/shape to resist the flow of charge

in Ohms

R= (resistivity)(L/A)

length/area

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17
Q

How does resistance vary with temperature

A

R= R0 [1+ alpha (T-t0)]

increase in temperature leads to increase in resistance

18
Q

Ohms Law

A

V=IR

V= voltage/potential difference

19
Q

capacitor

A

temporarily stores energy in a circuit

stores energy in the form of separated charge

separation creates an electric field

20
Q

parallel plate capacitor

A

two places of conductive material separated by a small distance

one holds positive, other holds same amount of charge but negative

electric field is constant everywhere between plates

21
Q

Electric field of parallel capacitor

A

E= (1/k)(Q/AE0)

k= dielectric
q= charge on plate

22
Q

Dielectric k

A

k= 1/(4piE0)

substance between the plates of a capacitor

acts like a insulator and resists formation of electric field

23
Q

capacitance

A

ability to store charge per unit of voltage

high capacitance can store a lot of charge art low voltage

C=Q/v

24
Q

Charge in parallel plate

A

charge is proportional to area, charge is on surface so thickness does not matter

father separated means greater voltage and lower capacitance

25
Q

Parallel plate capacitance equation

A

C= k (AE0/d)

C increases as area increases and as distance decreases

26
Q

Energy stored in a capacitor

A

U=1/2 QV

Q=CV

27
Q

In series

A

any two components NOT separated by a node

28
Q

In parallel

A

Single components in alternate paths connecting the same nodes

29
Q

Resistors in series

A

Charge drops each time it passes and dissipates energy

Reff= R1+R2 + R3…

increasing length will increase R

Total length= sum resistors

30
Q

Resistors in parallel

A

1/Reff= 1/R1 + 1/R2 …

area= sum of area, increasing area will decrease resistance

voltage drop is the same, have lower resistances to pass through

31
Q

Capacitors in series

A

1/Ceff= 1/C1 + 1/C2….

increasing distance will decrease capacitance

distance total= distance between first and last capacitor

32
Q

Capacitors in parallel

A

Ceff= C1 +C2…

area= sum

increasing area will increase capacitance (can spread out and have smaller repulsive)

33
Q

Ammeter

A

measures current flowing through a circuit

uses series of circuit

R=0 to maximize current

34
Q

Voltmerer

A

measures potential difference between two points

attached at two points on circuit in parallel

does not draw current - infinite resistance

35
Q

multimeter

A

ammeter and voltmeter

switch to determine

36
Q

magnetic field

A

measured in tesla, created by moving charges

37
Q

magnetic field lines

A

north to south

38
Q

magnets in field

A

force pulls south pole opposite direction of magnetic field lines, north in same direction as lines

39
Q

What does changing an electric field do

A

creates a magnetic field

AND Changing a magnetic field creates an electric field

40
Q

Magnetic force

A

experienced by a charge moving through a magnetic field

perpendicular to velocity and magnetic field

F=qvBsin theta

EK physics (6 decks)

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