# Physics

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- Created by: Katie Tottenham
- Created on: 19-03-13 21:02

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

#### Back

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

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