# Physics

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Potential Difference
Electrical energy transferred per unit charge when electrical energy is converted to some other form of energy
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Volt
Unit of potential difference and emf. 1V=1Js-1
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Electromotive force
Electrical energy transferred per unit charge when one form of energy is converted into electrical energy
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Resistance
A property of a component that regulates the electric current through it
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Ohm
Unit of resistance. 1 ohm = 1VA-1
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Kilowatt hour
Unit of energy. 1kWh= 1000W for 3600s
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Fuse
Electrical component designed to heat up,melt and break the circuit when a specified amount of electric current passes through it.Used as a safety device.
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Kirchoff's first law
The sum of the currents entering any junction is always equal to the sum of the currents leaving the junction (a form of conservation of charge)
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Kirchoff's second law
The sum of the emfs is equalmto the sum of the pds in a closed loop (a form of conservation of energy)
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Terminal PD
The potential difference across a source's terminals
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Progressive wave
A wave that travels from one place to another
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Longitudinal wave
A wave where the oscillations are parallel to the direction of wave propagation
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Transverse waves
A wave where the oscillations are perpendicular to the direction of wave propagation
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Displacement
The distance travelled in a particular direction
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Amplitude
Maximum displacement of a wave from its mean (or rest) position
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Wavelength
The smallest distance between one point on a wave and the identical point on the next wave
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Period
Time taken for one complete pattern of oscillation
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Phase difference
Difference by which one wave leads or lags behind another
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Frequency
The number of oscillations per unit time,measured in hertz
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Speed of wave
Distance travelled by a given point on the wave in a given interval of time
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Reflection
When waves rebound from a barrier,changing direction but remaining in the same medium
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Refraction
When waves change direction when they travel from one medium to another due to a difference in the wave speed in each medium.
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Diffraction
When a wave spreads out after passing around an obstacle or through a gap
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Principle of superposition of waves
When two or more waves of the same type exist at the same place,the resultant wave will be found by adding the displacements of each individual wave
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Interference
The addition of two or more waves that results in a new wave pattern
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Coherence
Two waves with a constant phase relationship
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Path difference
The difference between the distances travelled from their sources by two waves meeting at a point
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Constructive interference
When two waves combine to make a wave with a larger amplitude
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Destructive interference
When two waves combine to make a wave with a smaller amplitude
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Nodes
A point that always has zero amplitude along a stationary wave caused by destructive interference
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Antinodes
A point of maximum amplitude along a stationary wave caused by constructive interference
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Fundamental mode of vibration
The normal mode of vibration having the lowest frequency
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Harmonics
Whole number multiples of the fundamental frequency of a stationary wave
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Photon
A quantum of light
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Work function energy
The minimum energy required to release an electron from a material
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Threshold frequency
The lowest frequency of electromagnetic radiation that will result in the emission of photoelectrons from a specified metal surface
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Coulomb
Unit of electric charge. 1C = 1A x 1s
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Conventional current
A model used to describe the movement of charge in a circuit 9travels from + to -)
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Electron flow
The movement of electrons from - to +
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Ohm's law
The electric current through a conductor is proportional to the potential difference across it provided physical conditions remain constant
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Power
The rate of doing work
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Electron volt
One electronvolt is the energy change of an electron when it moves through a potential difference of one volt
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Photoelectric effect
The emission of electrons from the surface of material when electromagnetic radiation is incident on the surface
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Resistivity
The ratio of the product of resistance and cross sectional area of a component and its length
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## Other cards in this set

### Card 2

#### Front

Unit of potential difference and emf. 1V=1Js-1

Volt

### Card 3

#### Front

Electrical energy transferred per unit charge when one form of energy is converted into electrical energy

#### Back ### Card 4

#### Front

A property of a component that regulates the electric current through it

#### Back ### Card 5

#### Front

Unit of resistance. 1 ohm = 1VA-1

#### Back 