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 Current The Rate of flow of Charge 1 coulomb Amount of charge that passes in 1 second when current is 1 ampere. Potential Difference Work done per unit of charge Mean Drift Velocity Average velocity of the charge carriers Resistance Property of a component that regulates the electric current through it. 3 Things that affect resistance LengthAreaResistivity how does length affect the resistance of a wire? The longer the wire, the more difficult it is to make a current flow through it. How does area affect resistance? The bigger the area, the lower theresistance Restivity Ratio of the product of resistance and cross sectional area of a component to its length Ohms Law Current is directly proportional to the potential difference provided temperature stays constant. Name the component Metallic conductor Name the component Filament Lamp Thermistor Resistor with a resistance that depends on temperature. Negative Coefficient Thermistor Resistance decreases as temperature increases. Resistance of LDR the greater the light intensity the lower, the lower the resistance. Diodes Only let current flow in one direction (forward bias). resistance is very high in the reverse bias. Name the component Diode Power Rate of transfer of energy Kilo-watt hour 3,600,000 Joules E.m.f Total work done by a battery on each coulomb of charge Internal resistance Resistance to an electric current of the materials inside. Kirchoff's first law Total current entering a junction is equal to the total current leaving it. Kirchoff's second law Total emf around a series circuit is equal to the sum of the p.d's across each component. Potential divider Circuit using two resistors in series to split or divide up the p.d in proportion to the resistance of the components. Potentiometer A variable resistor What is the photoelectric effect? Emission of electrons from the surface of a material when electromagnetic radiation is incident on it. electronvolt kinetic energy gained by an electron when it is accelerated through a potential difference of 1 volt. Threshold frequency minimum frequency of radiation to ionise an electron from a metal surface. quantum Small discrete unit of energy. photon quantum associated with electromagnetic energy explain relation between intensity and photoelectron emission. number of photoelectrons emitted is directly proportional to the intensity of the radiation. provided its frequency is equal to or above the threshold frequency of the metal. wave particle duality The theory that all objects can exhibit wave and particle properties. De Broglie's wavelength Equation expressing the wavelength of a particle as a ratio of Planck's constant and particle momentum work function minimum energy required to release an electron from its surface, overcoming the electrostatic attraction between the electron and the positive metal ion. moments the turning effect of a force the principle of moments for an object to be in equilibrium, the sum of the clockwise moments must be equal to the sum of the anti-clockwise moments. torque the turning effect produced by a couple pressure force per unit area Archimedes' priniciple when a body is completely or partially submerged in fluid. it experiences an upthrust equal to the weight of the object. what causes upthrust? caused by the top and bottom of a body being at different depths. power work done per second density mass per unit volume