# final

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• Created by: Susie
• Created on: 04-06-13 22:11
Kirchoff's first law
sum of current entering a junction=sum of current exiting a junction
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kirchoff's 2nd law
total emf=sum of pd of all componants
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potential difference
1V=1J/C energy per unit charge. loss of electrical energy
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electromotive force
gain of electrical energy
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ohms law
constant temperature, I and V are proportional in a conductor
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i/v resistor
straight
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i/v filament lamp
s
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i/v LED
at 0 until 6V
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-last longer -one goes out others stay on -efficient energy conversions
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resistivity
the resisting power of 1m 1m2 length. Relies on intensity and temperature
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fuse
a sudden surge from when the earth wire touches the case blows the fuse to stop the circuit getting any hotter
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increase temp
releases more charge carriers
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UV-A
ageing
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UV-B
cancerous, tan
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UV-C
ozone
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Polarized
only oscillates in one direction
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Malus' Law
polarisation angles I=io cos2 pheta a= ao cos pheta
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Principle of superposition
the resultant displacement of the wave is the sum of the vector componants
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F=wD/d
fringe spacing= wavelength * distance from slits to screen/distance between slits
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Photon
quantum of energy of electromagnetic radiation
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Electron volt
kinetic energy gained when electron is accelerated by 1v
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Finding Planks constant
know w find V plot V and 1/w m= hc/e c and e are constants
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Work function
min energy to release electron
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threshold frequency
min frequency needed to give wf
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Max. KE
hf=wf+ max ke
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Intensity is proportional tooooo
A^2 and energy and current
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faster and increased wavelenght
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## Other cards in this set

### Card 2

#### Front

kirchoff's 2nd law

#### Back

total emf=sum of pd of all componants

### Card 3

#### Front

potential difference

### Card 4

#### Front

electromotive force

ohms law