Electric Current and Material Properties of Solids Glossary |

current which reverses its direction of flow over time - usually viewed as a "wave" trace on an oscilloscope | |

the unit of electric current - when a charge of one coulomb flows for one second | |

A in r = R A / L | |

The greatest stress a material can bear is called the ______ _________ | |

a material that will usually fracture with very little force applied can be described as being _____ | |

the quantity of electricity - expressed as a positivity or a negativity - can be measured in coulombs | |

the unit of charge | |

the rate of flow of charge | |

mass per unit volume | |

the force beyond which a material should not be subjected if it is to obey Hookes Law | |

_____ _________ ________ = area under the Hooke's law portion of a Force / extension graph | |

the energy provided by a power source per unit charge - it is also the pd of the power source when no current flows | |

emf is related to the ______ provided per unit charge within the power supply | |

____ _______ in stretching a material = 1/2 force x extension | |

I / V characteristic shows a symmetrical curve for this non-ohmic conductor | |

vibrations in a time interval - also it is f in f = 1 / T | |

the number of vibrations per second | |

when a forces is applied to a material & the force is proportional to extension - then it obeys _____ _____ | |

the resistance inherent in any power source in which energy is dissipated | |

to calculate the sum of parallel resistors we need to _____ each resistance before we add them and then _____ the result | |

the unit of energy | |

the laws which describe how current and voltage are distributed in series and parallel circuits | |

L in r = R A / L | |

the unit of resistance = 1 volt per ampere | |

the unit of resistivity | |

a conductor that obeys ohm's law - in which V is proportional to I at constant temperature | |

this law applies when current is proportional to voltage at constant temperature | |

a device used to display a.c. waveforms on a cathode ray tube | |

a method of connecting components in which each component has its own branch before and after the component - they share the same p.d. | |

the maximum voltage of a.c. measured from the central position (equivalent to amplitude) | |

a material that retains some of its extension after the force has been removed can be described as being ________ | |

the work done per unit charge - usually measured across a component in a circuit | |

a network of (usually) two resistors connected in series that allows the voltage to be shared across each resistance | |

the rate of energy dissipation | |

the ratio of potential difference to current | |

the resistance of a material taking into account its length and its cross sectional area | |

the rms value of current or voltage in ac circuits - the value that gives the effective power output when compared to its d.c. equivalent | |

a conductor that conducts electricity in one direction only | |

a method of connecting components in which there are no branches - all the electricity flows though each component with the same current | |

the shape of an a.c. wave form that follows this pattern x = sin(x) | |

ohm's law only applies at constant ______ | |

______ ______ = extension / original length | |

_____ ______ = force acting on the cross sectional area of a material under tension | |

a device which is designed to have a resistance that depends upon its temperature: an inc. T leads to a dec. R | |

the control on a CRO that allows us to vary the time taken for the moving electron beam to move through one horizontal division | |

the time between subsequent peaks (or troughs) in an a.c. wave form - also the shortest time interval between two parts of a wave form that have the same phase difference | |

the unit of emf and potential difference = one joule dissipated per coulomb of charge | |

the control on a CRO that allows us to vary the voltage required to move the beam through on vertical division | |

_____ ______ = force x distance moved - it is also related to the energy dissipated in components having resistance | |

tensile stress / tensile strain |

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