Physics Definitions 0.0 / 5 ? PhysicsASOCR Created by: DaveMorris1Created on: 11-05-13 12:49 Coulomb The charge transported by a steady current of one ampere in one second 1 of 37 Electric Current The flow of charged particles 2 of 37 Conventional Current The direction in which positive charges would flow in a circuit 3 of 37 Resistance Potential Difference / Current 4 of 37 Resistivity (Resistance x Cross Sectional Area) / Length 5 of 37 Ohm's Law For a metallic conductor at constant temperature, the current in the conductor is directly proportional to the potential difference accross its ends 6 of 37 Kirchoff's First Law The sum of the currents entering a point is equal to the sum of the currents leaving the same point 7 of 37 Kirchoff's Second Law The sum of the e.m.f.'s around any closed loop is equal to the sum of the p.d,;s around the same closed loop 8 of 37 Mean Drift Velocity The average distance travelled by the electrons along a wire per second 9 of 37 Kilowatt-hour The enegry transformed by a 1kW device in a time of 1 hour 10 of 37 Potential Difference The energy transferred (lost) per unit charge 11 of 37 Electromotive Force The energy transferred (gained) per unit charge 12 of 37 Progressive Wave A transfer of energy as a result of the oscillations of the medium or particles through which the wave is travelling 13 of 37 Longitudinal Wave Wave vibrations are parallel to the wave direction 14 of 37 Transverse Wave Wave vibrations are perpendicular to the wave direction 15 of 37 Displacement The distance of a point on the wave from the equilibrium position 16 of 37 Amplitude The maximum displacement of any point on the wave from the equilibrium position 17 of 37 Wave Speed The speed at which energy is transmitted by the wave 18 of 37 Frequency The number of oscillations at a point per unit time 19 of 37 Period The time taken for one complete oscillation 20 of 37 Infrared Radiation Part of the EM spectrum with a wavelenth of 1 x 10^-6 m 21 of 37 Interference When two waves meet a point, there is a change in the overall displacement 22 of 37 Principle of Superposition When two waves interfere at a point, the resultant displacement is the sum of the individual displacements 23 of 37 Path Difference The extra distance travelled by one of the waves compared with the other 24 of 37 Coherence A constant phase difference between the waves 25 of 37 Coherent Sources Sources of waves which have a constant phase difference 26 of 37 Diffraction The spreading out of a wave after passing through a gap or around an obstacle 27 of 37 Plane Polarisation Plane polarised waves oscillate in one plane only 28 of 37 Intensity The rate of energy transmitted per unit area at right angles to the direction of propagation (Wm^-2) 29 of 37 Standing Wave A wave consisting of nodes and antinodes which does not transfer energy 30 of 37 Node A point where the amplitude of vibrations is always zero 31 of 37 Antinode A point where the amplitude of vibrations takes the maximum possible value 32 of 37 Threshold Frequency The minimum frequency of radiation needed for elctrons to be ejected from a metal surface 33 of 37 Photon A packet of energy OR a quantum of electromagnetic radiation 34 of 37 Electronvolt The energy gained by an electrol which is accelerated through a potential difference of 1 volt 35 of 37 Workfunction of a Metal The minimum energy required to eject an electron from a metal surface 36 of 37 Continuous Spectrum All frequencies are present in the radiation 37 of 37
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