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