Pages in this set

Page 1

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Current:
- Flow of charge per unit time
o Electrons in metals, ions in electrolyte - Conventional current ­ a model used to
describe the movement of charge in a circuit (positive to
negative) - Electron flow ­ the movement of electrons around a circuit (negative to positive) -
One…

Page 2

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Page 3

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- Number densities ­ if low electrons have more space to move and collide with each other less
resulting in higher drift velocities
Potential Difference (p.d.):
- Energy transferred per unit charge, when electrical energy is converted to another type - One
Volt = one Joule per Coulomb - Voltmeter…

Page 4

Preview of page 4
Experiment to determine I/V characteristics:
- Vary current and p.d. using variable resistor - Record current and p.d. from ammeter and
voltmeter - Plot I/V graph - Resistance = gradient-1
Light Emitting Diodes (LEDs):
- Only allow current to flow in one direction and emit light when
a p.d. is…

Page 5

Preview of page 5
Negative Temperature Coefficient (NTC) as is for semiconductors:
- A thermistor has a NTC ­ when heated electrons in the thermistor gain enough energy to
escape the
metal lattice - This increases the number of charge carriers available (increasing n) which
causes a fall in resistance - Light dependent resistors…

Page 6

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- Advantages :
o If a continuous record of temperature or light intensity is needed, you can connect a data
logger to the thermistor or LDR because they produce electrical outputs o eliminate the
chance of human error in the calculations o Can plot accurate graphs straight away o Very…

Page 7

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Progressive wave:
- A wave that transfers energy from one place to another
- Wave speed ­ the speed at which energy is transmitted by a wave v = f
Refraction:
- Change in direction of a wave as it crosses an interface between two
materials where its speed changes…

Page 8

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imaging, medical treatment
Photographic film
Gamma rays () 10-10 ­ 10-16 Geiger Müller tube

Page 9

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Ultraviolet:
- All can damage the eyes - UV-A
o 99% of UV, causes tanning and wrinkles - UV-B
o Can cause DNA in skin to become damaged causing skin cancer - UV-C
o Absorbed by the ozone layer
Polarisation of waves:
- If a transverse wave is incident on…

Page 10

Preview of page 10
from coherent sources at a
particular point

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Pages in this set

Page 1

Preview of page 1
Current:
- Flow of charge per unit time
o Electrons in metals, ions in electrolyte - Conventional current ­ a model used to
describe the movement of charge in a circuit (positive to
negative) - Electron flow ­ the movement of electrons around a circuit (negative to positive) -
One…

Page 2

Preview of page 2

Page 3

Preview of page 3
- Number densities ­ if low electrons have more space to move and collide with each other less
resulting in higher drift velocities
Potential Difference (p.d.):
- Energy transferred per unit charge, when electrical energy is converted to another type - One
Volt = one Joule per Coulomb - Voltmeter…

Page 4

Preview of page 4
Experiment to determine I/V characteristics:
- Vary current and p.d. using variable resistor - Record current and p.d. from ammeter and
voltmeter - Plot I/V graph - Resistance = gradient-1
Light Emitting Diodes (LEDs):
- Only allow current to flow in one direction and emit light when
a p.d. is…

Page 5

Preview of page 5
Negative Temperature Coefficient (NTC) as is for semiconductors:
- A thermistor has a NTC ­ when heated electrons in the thermistor gain enough energy to
escape the
metal lattice - This increases the number of charge carriers available (increasing n) which
causes a fall in resistance - Light dependent resistors…

Page 6

Preview of page 6
- Advantages :
o If a continuous record of temperature or light intensity is needed, you can connect a data
logger to the thermistor or LDR because they produce electrical outputs o eliminate the
chance of human error in the calculations o Can plot accurate graphs straight away o Very…

Page 7

Preview of page 7
Progressive wave:
- A wave that transfers energy from one place to another
- Wave speed ­ the speed at which energy is transmitted by a wave v = f
Refraction:
- Change in direction of a wave as it crosses an interface between two
materials where its speed changes…

Page 8

Preview of page 8
imaging, medical treatment
Photographic film
Gamma rays () 10-10 ­ 10-16 Geiger Müller tube

Page 9

Preview of page 9
Ultraviolet:
- All can damage the eyes - UV-A
o 99% of UV, causes tanning and wrinkles - UV-B
o Can cause DNA in skin to become damaged causing skin cancer - UV-C
o Absorbed by the ozone layer
Polarisation of waves:
- If a transverse wave is incident on…

Page 10

Preview of page 10
from coherent sources at a
particular point

Comments

No comments have yet been made