# hgfd

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- Created by: Gregory Brewster
- Created on: 14-01-15 23:09

What oxygen containing compounds are added to petrols to increase the octane number?

oxygenates

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Oxygen and Octane Number

oxygen molecules have a high octane number

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Why do alcohols burn more completely?

-needs less O2 -for same amount of fuel

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Least Penetrating Radiation

alpha

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Most Deflected Radiation

beta

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Why do metals conduct electricity?

free delocalised electrons carry a charge through the cations

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Amylose Structure

straight

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Amylopectin Structure

branched

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Starch Molecules

amylose + amylopectin

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Oxygen and Permeability

-small atom -non polar -able to diffuse

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Chlorine ion and Permeability

-they have a charge - cant pass through a pholip bl -requires channel proteins -active transport -CTFR channel protein

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Water and Permeability

-passes through epithelial cells -polar so it struggles -it is small so it does manage -uses channel proteins as well

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Blood Clot Process

-cascade -thromboplastin is an enzyme -prothrombrin>thrombrin -fibrinogen>fibrin -insoluble fibrin mesh traps platelets/RBC -calcium/potassium facilitate enzymes

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What is the population not?

all the people being tested

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Define

write the equation

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High Resistance Anomaly

a resistance reading which is significantly higher than others in the survey

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Less water and Resistivity

less resistivity

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If there are 2 wires and resistivity is being measured

times the length by 2

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Error Equation

the added value/original value x 100

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When writing about how significant something is

write how and also compare it to other values that have been measured and wh

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Potential Divider

two resistors connected in series with a supply. Usually represented as one box and the p.d. is shared equally between them

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How can Potential Dividers be used in circuit?

to supple p.d. to another circuit that ha less than the p.d. of the power supply

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In conventional current the current leaves the +/- side?

it leaves the positive side

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What happens to the voltage as it leaves a resistor

the voltage becomes 0

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How do you decrease the voltage in a resistor

you decrease the distance travelled

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Why wouldn't a bulb light if it was over a 3.0v potential divider?

-lamp is parallel with lowest of 1/3 of AB -when resistors are in parallel the resistance decreases -p.d. across a lamp reduced to below 3v -no longer enough current to light the lamp

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What does the way an electron travels around an object tell you about the object?

the material has a regular structure

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The spacing of the objects atoms are the same as?

the electrons wave length

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Why should the resistance of a resistor should not be measured in a circuit?

-other currents/voltages/resistances are present -example (wires) -change in current changes resistance readings

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Open Circuit

the power supply has no connections between terminals and have a high resistance I=0 V=

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Short Circuit

power supply terminals are joined by a connection with no resistance V=0 I=

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Conventional is positive which means

current leaves the positive terminal and enters the negative

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Current in a Metal

the current is negative electrons and so they move in the opposite direction

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Ammeter

measures current (amps) and is connected in series

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Voltmeter

measures potential difference (volts) and is connected in parallel

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Increased Potential Difference on Current

increase in curren

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Ohms Law

current is directly proportional to potential difference

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Non Ohmic

not proportional

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Increases Current on Resitance

decrease in resistance

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Why does resistance increases in metals?

-free electrons -as they collide with lattice vibrations they scatter -hotter metal more vibrations -more collisions between atoms and electrons -the current decreases -if the current has decreased then the resistance has increases

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The faster electrons move

the slower the current

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Semiconductors

have fewer free electrons

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Positive Semi Conductor

resistance increases as the temperature increases

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Negative Semi Conductor

resistance decreases as the temperature decreases

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A material with a small resistivity?

it will be a good conductor as it has a large number of free electrons

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If the device obeys Ohm's Law

the resistance will no change

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Resistance base unit

VA^-1

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Resistance SI unit

ohms

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Resistance equation symbol

R

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Power definition

the rate of doing work and the transfer of energy

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Power base unit

Js^-1

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Power SI unit

watts

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Power equation symbol

P

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Power equation

W/t E/t VQ/t

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Current definition

rate of flow of charged particles

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Current base unit

Cs^-1

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Current SI unit

amps

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Current equation eymbol

I

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Potential Difference definition

measure of energy transfer between two points

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Potential Difference base unit

JC^-1

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Potential Difference SI unit

volts

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Potential Difference equation symbol

V

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Potential Difference equation

W/Q

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Charge base unit

sA

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Charge SI unit

coulomb

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Charge symbol equation

C

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Charge equation

It

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Work definition

energy transferred

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Work base unit

kgm^2s^-2

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Work SI unit

Joule

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Work equation symbol

W

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Work equation

QV

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Resistance equation

VI pl/A

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Current equation

Q/T

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Electro Motive Force definition

energy supplied to each coulomb

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Electro Motive Force equation

V+Ir

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Electro Motive Force equation meanings

V= energy transferred by load resistor Ir= energy transferred due to internal heating

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Extra Symbols (n,q,v)

n= the number of conduction/free electrons per unit volume q=the charge on an electron v= the drift velocity of a free electron

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V1/V2

R1/R2

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Area under a velocity time graph

distance

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Ductile is also

Malleable

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Illustrate

draw

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How to find upthrust

times the mass of the water displaced by gravity

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Stokes Law is used to find

viscous drag

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Rate of Work Done

W/t

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The maximum speed equation

V=u+at

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When calculating from a graph

use the end

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Energy stored in a material on a graph

area under the graph = 1/2F x

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## Other cards in this set

### Card 2

#### Front

Oxygen and Octane Number

#### Back

oxygen molecules have a high octane number

### Card 3

#### Front

Why do alcohols burn more completely?

#### Back

### Card 4

#### Front

Least Penetrating Radiation

#### Back

### Card 5

#### Front

Most Deflected Radiation

#### Back

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