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Topic 6 vocab

Physics Vocabulary

TermDefinition
Ammeter A low resistance device wired in series in an electric circuit, used to measure the current. - Consist of a shunt connected in parallel with a galvanometer -Symbol= -------A------
Ampere (A) The SI unit of electric current, defined as one coulomb of charge passing a point in one second: 1 A= 1 C/s
Circuit The complete path of electric current including the source of the current and the resistors.
Conductivity The reciprocal of the resistivity of a substance' a measure of how well a substance sustains a electric current.
Conventional Current Model The current flows out of the positive terminal, through the circuit and into the negative terminal of the source. -" right hand rules"
Current The amount of electric charge flowing past a specific point in a circuit for a unit of time.
Direct Current (DC) An electric current that flows in only one direction.
Electric Circuit A closed path in which an electric current can flow. The path must include a source of potential difference, and may include one or more resistors.
Electric Current The flow of electric charge, measured as the rate at which electric charge flows past a given point. - The SI unit of current is the ampere, A; 1 ampere= 1 Coulomb per second (1 A= 1 C/s)
Electric Power The time- rate at which electric energy in expended. - The watt (W) is the SI derived unit for electric power. -For conductors that obey Ohm's Law - Scalar quantity (W=PT=Vlt=I^2RT=V^2T/R)
Equivalent Resistance A single resistance that is equivalent to as set of resistances in a series or parallel circuit.
Kirchoff's Law Conservation of Charge : The sum entering any current junction is equal to the sum leaving that junction.
Magnet Contains material, usually iron, whose nuclei are oriented in a common direction. - Have Polarity -Opposites attract, Likes repel
Magnetic Field Exist in areas around natural magnets and in regions around electric currents.
Magnetic Flux Lines A magnetic field is mapped by imaginary magnetic lines of force called flux lines. -The lines of force always for closed paths(never cross)
Ohm The SI derived unit of resistance. - One Ohm= 1 volt per ampere (1 Ohm =1 V/A)
Ohm's Law At a constant temperature, the current in a metallic conductor is directly proportional to the potential difference between its ends and inversely proportional to its resistance: V=IR - Does not hold for semiconductors
Parallel Circuit A circuit in which there is more than one current path.
Resistance Opposition to current flow offered by a conductor or semiconductor; the ratio between potential difference across and current in a conductor: R=V/I
Resistor A device that offers resistance in an electrical circuit.
Series Circuit A circuit in which there is only one current path.
Voltage Another name for electrical potential difference, arising from the volt, the unit of measure for potential difference.
Voltmeter A high resistance device used to measure the potential difference across two points in an electric circuit.
Watt (W) The SI unit of power; a derived unit equivalent to one joule per second: 1W=1J/s
Resistivity A quantitative indication of the electrical resistance of a material at specific temperature.
Volt (V) The SI unit of electric potential or potential difference.
Cross Section A view of a solid made by cutting it perpendicular to its longest axis
Grounding The addition or removal of electrons to or from an object in order to naturalize its charge.
Created by: jwhitm5