Module 4 definitions

New spec starting 2015

Electrons, Waves and Photons

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• Created by: sweens_a
• Created on: 21-05-16 15:37
Ammeter
A device used to measure electrical current and must be placed in series (ideally zero resistance)
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Ampere (A)
The base SI unit of electric current. The current flowing through two parallel wires in a vaccum 1m apart such that there is an attractive force of 2.0x10-7N per meter length of wire between them.
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Amplitude (waves)
The maximum displacement of a particle from its equilibrium position. (positive or negative)
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Anode
Positively charged electrode
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Antiphase
Particles oscillating completely out of step with each other (one reaches maximum positive displacement the same time the other reaches its maximum negative displacement)
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Charge carrier
A particle with charge that moves through a material to form an electric current.
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Coherence
Two waves sources, or waves, that are coherent have a constant phase difference
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Compression (waves)
A moving region in which the medium is denser or has a higher pressure than the medium surrounding it
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Conservation of Charge
electric charge cannot be created nor destroyed
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Constructive interference
Superposition of two waves in phase so that the resultant wave has a greater amplitude than the two original waves.
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Conventional Current
Current travels from positive to negative
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Coulomb
SI unit of electrical charge. 1 coulomb of charge passes a point per unit time when there is a current of 1A
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Critical Angle
The angle of incidence at the boundary between two media that will produce an angle of refraction of 90 degrees.
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Destructive interference
Superposition of two waves that are in antiphase so they cancel each other out and the resultant wave has an amplitude smaller than the two originals.
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Diffraction
The spreading out of waves when it passes through a gap very similar to the size of its wavelength or around an obstacle
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Diode
A component that only allows current to flow in one direction
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Displacement (waves)
The distance from the equilibrium position in a particular direction (positive or negative)
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Electric Current
The rate of flow of charge
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Electromagnetic Waves
Transverse waves that do not require a medium to propagate. They have oscillating magnetic and electric components.
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e.m.f
Electromotive force. The work done on the charge carriers per unit charge (energy transferred to electrical energy from other forms)
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Equilibrium Position (waves)
Resting position for particles in the medium
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Frequency (waves)
The number of wavelengths passing a point per unit time
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Other cards in this set

Card 2

Front

The base SI unit of electric current. The current flowing through two parallel wires in a vaccum 1m apart such that there is an attractive force of 2.0x10-7N per meter length of wire between them.

Ampere (A)

Card 3

Front

The maximum displacement of a particle from its equilibrium position. (positive or negative)

Card 4

Front

Positively charged electrode

Card 5

Front

Particles oscillating completely out of step with each other (one reaches maximum positive displacement the same time the other reaches its maximum negative displacement)