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  • right-handed three finger rule

    the rule that says if the thumb points in the direction of the charge's motion, the index finger points in the direction of magnetic induction and the bent middle finger points in the direction of magnetic force

    electromagnetic induction

    term for the generation of current by means of a conductor's motion through a magnetic field

    magnetic flux

    term for the quanity of flux linking a conducting loop

    the magnetic flux is changing.

    When a single conducting loop or segment thereof is passing through a magnetic field, current is generated in the loop if and only if...

    ammeter

    term for a meter used to measure small amounts of current

    False

    True or False: The mere presence of a magnetic field is enough to induce current within a coil.

    magnetic field

    Current is induced within a coil by relative motion between the coil and a(n) _____ ___.

    speed

    The ___ of relative motion between a coil and a magnetic field determines how much current is prodced.

    strength

    The current induced by a magnetic field depends on the ____ of the field.

    number of turns

    Current varies directly with the ___ __ ___ in a coil.

    law of induction

    law that says that a change in magnetic flux specifically induces potential difference, which instantaneously produces a current

    Michael Faraday

    the scientist who is famous for discovering electromagnetic induction

    opposes

    Induced current is directed so as to create a magnetic field that ____ the motion causing the current.

    Lenz's law

    the law that states that the current induced by a change in magnetic flux is directed so as to create a magnetic field that opposes the change

    opposing

    According to Lenz's law, when the flux passing upward through the second coil increases, the induced current must create a(n) ____ magnetic field.

    similar

    When the flux passing through the second coil decreases, the second coil's induced current must create a(n) ____ magnetic field.

    electric generator

    term for a device that produces current by electromagnetic induction

    armature

    term for the conducting loop that rotates between the poles of a pemanent magnet in a simple electric generator

    slip rings

    term for the rings which rotate with the armature to allow constant contact betwee the armature and the brushes

    brushes

    term for stationary pieces of metal that provide a path for the current to flow to and from the appliance powered by an electric generator

    alternating current (AC)

    term for current that changes direction

    direct current (DC)

    term for current that always flows in the same direction

    commutator

    term for a split ring on which the ends of the loop terminate in a single-loop generator

    rotor

    term for a magnet that rotates inside the stator

    stator

    term for a stationary armature in a DC generator

    prime mover

    term for the source of mechanical energy that drives a generator

    three-phase current

    term for current composed of three currents phased 120 degrees apart

    torque

    Since each force is exerted at a distance from the axis of rotation, each produces a(n) ___.

    torque arm

    term for the perpendicular distance (r) from the axis of rotation to the line of the force

    motor

    term for a freely rotating loop mounted in a magnetic field and fed with current that reverses periodically

    two-pole motor

    term for a motor with a predominant north pole coupled with a single south pole

    hysteresis

    term for the delay before a material conforms to an external magnetic field

    eddy currents

    term for tiny currents that produce small magnetic fields working against the rotating armature in a motor

    electrochemical cell

    term for a device that produces electrical current through a chemical reaction

    electrodes

    term for two strips that are immersed in an aqueous solution

    aqueous solution

    term for an ionic solid dissolved in water

    electrolyte

    term for an aqueous solution in which electrodes are submerged

    salt bridge

    term for a porous material soaked with a suspended aqueous solution

    load

    term for an appliance that uses a current's energy to do some type of work

    anode

    term for a negative electrode, which supplies electrons to the conducting wire

    cathode

    term for the positive electrode, which draws electrons from the conducting wire

    battery

    term for a combination of two or more electrochemical cells

    series

    If the cells in a battery are connected so that the anode of one cell is connected to the cathode of the next and so on down the line, the cells are connected in ___.

    current-generating capacity, smallest

    The current delivered by cells connected in series is limited by the ______ _____ of the ____ cell.

    their individual voltages

    The voltage of cells connected in series is the sum of ___ ____ ____.

    parallel

    In a ____ combination of cells, all the anodes are connected and all the cathodes are connected.

    any individual cell's voltage

    The voltage of parallel cells is the same as ___ ____ ___ ____.

    thermocouple

    term for a complete circuit in which two conductors made of different materials come together at junctions maintained at different temperatures

    Seebeck voltage

    term for a potential difference between junctions

    Seebeck effect

    term for the appearance of the Seebeck voltage in an appropriate coupling of two conductors

    thermoelectric, temperature

    The magnitude of the Seebeck voltage depends on...
    1. The extent to which the two materials differ in their _____ characteristics and
    2. The ____ difference between the junctions.

    thermoelectric generator

    term for any device consisting of a thermocouple lodged within an apparatus that provides for the heating of one junction and the cooling of the other

    Peltier effect

    term for the heating or cooling of a junction between two dissimilar conductors in the pathway of current

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