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  • joule heat

    term for the heat generated by current when it passes through a resistance


    term for the time rate of work

    house current

    term for the current furnished by electric power companies

    rate, resistance

    The effective value of an alternating current is regarded as equal to the direct current that would produce heat at the same average ___ in the same _____.

    root-mean-square (rms) value

    term for the effective value of an alternating current


    term for the maximum charge that a plate can hold


    term for a charge-storing device consisting of two conductors in near relation but not touching


    the unit of capacitance

    microfarads, picofarads

    Because they typically store only very small amounts of charge, capacitors usually have capacitances measured in _____ or _____.

    area, closer together, dielectric

    Capacitance may be changed by:
    1.) Increasing the ___ of each plate.
    2.) Bringing the plates ____ _____.
    3.) Filling the gap between the plates with _____.


    term that describes a material that reduces the voltage associated with a given state of charge

    dielectric constant

    term for the factor by which capacitance is multiplied when a certain material is used as a dielectric

    dielectric strength

    term for the maximum potential gradient that a material can withstand before it begins to conduct current

    self-induced emf

    If a change in magnetic flux arises from a fluctuation of current within the conducting loop itself, ______ ___ is produced.


    An induced emf ____ the change inducing it.


    term for the tendency of a loop or a coil to oppose any change in current


    term for a circuit element with the property of self-inductance


    the unit of inductance

    primary, secondary

    If two coils in separate circuits are brought close together, changing current in the first (____) coil induces a current in the second (______) coil.

    mutual inductance

    term for the induction of an emf in one coil by another coil


    term for the combined effect of both mutual inductance and self-inductance


    Mutual inductance is measured in ____.

    packing density

    term for the number of turns per unit length of a coil

    series-aiding combination

    term for an arrangement in which the self-inductance in each coil is enhanced by mutual inductance because all the magnetic flux in both coils runs in the same direction

    series-opposing combination

    term for an arrangement in which self-inductance and mutual inductance have contrary effects


    term for a device for producing a fixed increase or decrease in voltage

    transformer equation

    term for the equation that relates the voltages and numbers of turns in the primary and secondary coils of a transformer

    step-up transformer

    term for a transformer that increases voltage

    step-down transformer

    term for a transformer that decreases voltage


    A well-designed transformer transmits energy from the primary circuit to the secondary circuit with above _____ percent efficiency.

    Joseph Henry

    the physicist who experimented with electricity and magnetism and discovered electromagnetic induction independently of Faraday

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