# Electrons, Waves and Photons Definitions

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• Created by: roopa
• Created on: 11-04-15 13:07
Define the Coulomb
The amount of charge that passes in 1 second when the current is 1 Amp
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Define Potential Difference
Energy transfer per unit charge from electrical to other forms
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Define Electromotive Force
Energy transfer per unit charge from chemical (or other) to electrical
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Define Volt
1 volt is one Joule per Coulomb
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Define Resistance
Resistance = Potential difference / current
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Define Ohm
transmitting a current of one ampere when subjected to a potential difference of one volt
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Define Resistivity
resistivity = RA/l where R is resistance, A is the cross sectional area and l is the length
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Define Kilowatt-hour
Either energy used by a device drawing 1kw of power for 1 hour. Or 3.6MJ
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Define Displacement (for waves)
How far a point on the wave has moved from its undisturbed position
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Define Amplitude
Maximum displacement
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Define Wavelegnth
distance between neighbouring identical points
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Define period
Time take for one complete oscillation
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Define phase difference
The fraction of a cycle between the oscillations of two particles. Or relates the oscillation of two points on the same wave, describing how of step one oscillation is from the other
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Define frequency
Number of waves passing through a point per unit time
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Define node
Points in a stationary wave where there is zero displacement of a particle at any time
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Define anti-nodes
Points on a stationary wave where displacement of the particles is at a maximum
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Define Electron-Volt
The kinetic energy gained by an electron when it is accelerated by a potential difference of 1V
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Define Work Function
The minimum amount of energy required to release an electrons from the surface of a material
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Define Threshold frequency
The lowest possible frequency of a photo that will cause an electron to be emitted from the material
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Define Intensity
The energy per unit area per second
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## Other cards in this set

### Card 2

#### Front

Energy transfer per unit charge from electrical to other forms

#### Back

Define Potential Difference

### Card 3

#### Front

Energy transfer per unit charge from chemical (or other) to electrical

### Card 4

#### Front

1 volt is one Joule per Coulomb

### Card 5

#### Front

Resistance = Potential difference / current