Definitions for Unit 2 As physics

All definitions that are needed outlined on the specification for unit 2 OCR

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Coulomb
The amount of charge that passes a point in a period of 1 second with a current of 1 ampere.
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PD (Potential Difference)
The electrical energy transferred per unit charge when electrical energy is converted into some other form of energy.
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Volt
Two points in a circuit are at a potential difference of one volt if one joule of energy is being dissipated for every one coulomb of charge passing between the points.
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EMF (elctro motive force)
the energy transferred per unit charge.
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Resistance
The resistance of a conductor is the ratio of potential difference to current.
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Ohm
A conductor has a resistance of one ohm if one volt is produced by a current of one Amp.
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Internal resistance
of a cell is the resistance between its terminals.
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Potential Divider
When a voltage supply is split by two resistors in series with the supply, the voltage across one of the resistors is a fraction of the supply voltage. This fraction is the same fraction that this resistor is of the total resistance.
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The mean drift velocity of charge
in a wire is the average speed of charged particles along the length of a conductor.
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Displacement
the distance it is in the positive direction from equilibrium.
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Amplitude
its maximum displacement.
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Wavelength
the distance between consecutive points which are in phase.
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Period
the time taken for it to complete one oscillation.
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Phase difference
The difference by which one wave leads or lags behind another. For example, in-phase waves are in step with each other. In waves that are completely out of phase one wave id half a wavelength in front of the other. Measured in radians.
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Speed of a wave
the speed a wave carries energy/information
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Frequency
the number of complete waves which pass a fixed point every second.
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Interference
The addition of two or more waves that result in a new wave pattern.
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Superposition
When two or more waves meet at a point the resultant displacement at that point is the vector sum of the displacements due to each wave.
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Coherence
For waves to be coherent sources they must either be in phase with each other or have a constant phase difference between them. For this to be the case they must have the same wavelength
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Path difference
the difference in distance travelled by the two waves from their respective sources when there is two sources.
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Stationary wave
is formed by the superposition of two waves travelling in opposite directions which have the same wavelength, frequency, speed, and period.
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Nodes
position of minimum (or zero) displacement
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Antinodes
position of maximum displacement.
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Fundamental frequency
The lowest frequency in a harmonic series where a stationary wave is formed.
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Harmonics
Whole number multiples of the fundamental of a stationary wave.
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Electron Volt
the energy gained by an electron travelling through a potential difference of one volt
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Work Function
of a metal surface is the minimum energy required for the electron to be emitted from the metal surface
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Threshold frequency
minimum frequency of photon required to cause the electron to be emitted from the metal surface.
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Other cards in this set

Card 2

Front

PD (Potential Difference)

Back

The electrical energy transferred per unit charge when electrical energy is converted into some other form of energy.

Card 3

Front

Volt

Back

Preview of the front of card 3

Card 4

Front

EMF (elctro motive force)

Back

Preview of the front of card 4

Card 5

Front

Resistance

Back

Preview of the front of card 5
View more cards

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