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OCR PHYSICS A > MODULE 4: ELECRICITY > Flashcards

MODULE 4: ELECRICITY Flashcards

(49 cards)

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1
Q

Ampere equation

A

I = Q/t

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2
Q

What is a conducting liquid called

A

Electrolyte

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3
Q

What is a coloumb

A

Electric charge

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4
Q

What is the charge of an electron, and it’s quantised version

A

1.6 x 10e-19 , +1e

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5
Q

What is conventional current

A

When current flows from positive negative, the holes left by the moving electrons

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6
Q

Kirchhoffs 1st law

A

Current going into a junction is the same as the current out

CONSERVATION OF CHARGE

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7
Q

What is mean drift velocity

A

Average velocity of electrons along the length of the wire, direction of force

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8
Q

What is number density

A

Number of charge carriers per unit volume of material

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9
Q

Number density equation

A

I=Anev

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10
Q

What are semiconductors

A

Metal conductors which have a less number density than normal metal conductors

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11
Q

Battery symbol

A

Two cells line and thicker one for negative

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12
Q

diode symbol

A

triangle and line on right

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13
Q

Thermistor symbol

A

Resistor with flat and diagonal line through

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14
Q

Variable resistor symbol

A

Resistor with arrow through

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15
Q

Resistor symbol

A

Rectangle

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16
Q

Fuse symbol

A

Rectangle with line through it

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17
Q

LDR symbol

A

Small resistor with two arrows points from top left

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18
Q

Filament lamp symbol

A

Circle with x

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19
Q

Led symbol

A

Diode with two arrows going out to top right

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20
Q

What is potential difference

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A

Energy transferred from electrical components to other forms like heat etc, per unit charge

21
Q

What is electromotive force

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A

Energy transferred from the battery/cell to the electrical components

22
Q

Voltage equation with energy

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A

V = WORK DONE / COULOMB

23
Q

What is an electron gun

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A

Device to accelerate electrons to high speeds

24
Q

What is inside a electron gun

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A

A filament and anode which have a potential difference.

Electrons are fired through and get speed from the pd, then go through a VACUUM inside a glass tube

25
Electron energy formula in electron gun
Ve = 1/2 mv^2 | Because v=energy/coulomb, Ve = energy
26
Resistance equation
R = V / I
27
What is ohmic conductor and what’s ohms law
Resistance is constant | For metallic conductor at CONSTANT temp, current in write is directly proportional to the potential difference across it
28
IV graph equation for resistor
Y=X
29
IV graph shape for filament lamp
Straight line with curves going to line parallel to x axis at each top and bottom y ‘_/‘ to midpoint then ‘/-‘ where dashes are curved, ie not straight appears only in middle of graph
30
Diode IV shape
Flat until a voltage threshold where is rapid increase.
31
What is diode bias
Which way the current goes through
32
What is resistivity and equation
Material property of how well it conducts, lower meaning better (let’s more current). R= pL/A
33
How does temperature affect metals
Higher resistance hit each other more making less current
34
How does temperature effect semiconductors
lower resistance because more charge carriers
35
What is a thermistor
Resistor that depends on temperature
36
What other type of thermistor and what does it do
NTC thermistor | Negative temperature coefficient
37
what does NTC thermistor do
Resistance decrease as temperature increases
38
What is LDR and its properties
Light dependent resistor, | Resistance decrease with more incident light
39
What is electrical power and equation
P=IV | Rate of electrical energy transfer
40
What is the kilowatt hour
Energy transferred by device with a power of 1000watts in one hour kWh = kW * hours
41
Resistance in series vs parallel
Series sum, parallel inverse sum
42
Work done equation in terms of potential difference
W=V * Q
43
Kirchhoff second law
In a closed loop | Sum of electromotive forces equals sum of potential differences
44
What is terminal pd
Pd across terminals of cell (ie whole circuit)
45
What are lost volts
Voltage around internal resistance
46
Electromotive force equation
E = IR + Ir = I(R + r)
47
What is a potential divider circuit
a simple circuit which takes advantage of the way voltages drop across resistors in series output pd is taken across a component (which is some of resistor)
48
Potential divider circuit equation
Vout = (Vin * R2)/(R1+R2)
49
What is number density and unit
Number of electrons per volume | m^-3

OCR PHYSICS A (5 decks)

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