Physics OCR AS unit 2
Define words
- Created by: emma
- Created on: 31-05-11 14:08
Coulomb
Define the:
Coulomb
The Coulomb
The charge passing a point in a circuit where there is a current of 1 amp for 1 second
Potential Difference
Define:
Potential difference (p.d)
P.d
Measure of energy or work done by each coulomb of charge as it moves from one point to another
Unit: VOLT (v)
volt
Define:
The volt
The volt
One volt is the potential difference between 2 points when one joule of energy is transferred by one coulomb of charge passing from one point to another.
Electromotive force (e.m.f)
Define:
electromotive force (emf) of a source such as a cell or power supply
E.m.f
The electrical energy gained by each coloumb of charge that passes through the power supply.
resistance
Define:
resistance
resistance
The resistance of a wire is defined as the ratio of the potential difference V across the wire the current I in it
ohm
Define:
The ohm
ohm
measurement of resistance, expressing the resistance in a circuit transmitting a current of one ampere when subjected to a potential difference of one volt
resistivity
Define:
Resistivity of a material
resistivity
The resistivity p of a material is numerically equal to the resistance between opposite faces of a cube of unit length, height and cross sectional area.
kilowhatt hour
Define:
The kilowatt-hour (kWh) as a unit of energy
kWh
A measure of electrical energy equivalent to a power consumption of 1,000 watts for 1 hour.
displacement
Define:
Displacement
displacement
Displacement of a particle on a wave is its distance from its rest position
amplitude
Define:
Amplitude
amplitude
The amplitude is the maximum displacement of a particle in the wave
wavelength
Define:
Wavelength
wavelength
The distance between two neighbouring peaks or two neighbouring troughs or two different points on the wave which are vibrating together in phase. It is the distance moved by the wave during one oscillation of the source of the waves.
period
Define:
Period
period
The period of the wave is the time taken for one particle to complete one vibration or one cycle
phase difference
Define:
Phase difference
phase difference
The phase angle by which one periodic disturbance or wavefront lags behind or precedes another in time or space.
frequency
Define:
Frequency
frequency
The number of complete vibrations per unit time
speed of a wave
Define:
Speed of a wave
speed of a wave
speed at which energy is transferred along the wave (for a progressive wave)
node
Define:
Node
node
When there is no vibration on a stationary wave - minimum amplitude
antinode
Define:
Antinode
antinode
place of maximum amplitude
fundamental mode of vibration
Define:
Fundamental mode of vibration
fundamental mode of vibration
when the wave pattern of a stationary wave has a single loop
harmonics
Define:
Harmonics
harmonics
any of a series of musical tones whose frequencies are integral multiples of the frequency of a fundamental tone.
electronvolt
Define:
The electronvolt (eV) as a unit of energy
electronvolt
The energy gained by an electron when it moves through a potential difference of 1 volt. 1eV = 1.6x10(-19) J
work function
Define:
Work function
work function
minimum amount of energy necessary for an electron to escape from the surface
threshold frequency
Define:
Threshold frequency
threshold frequency
the lowest frequency of light required to eject a photoelectron
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