invisible region around a charged object where an electric force is applied
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electric force
a force that two electrically charged objects apply to each other
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electric insulator
material in which electric charges cannot easily move
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electrically charged
having an unbalanced amount of positive charge or negative charge; positively charged objects have lost electrons and negatively charged objects have gained electrons
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electrically neutral
having equal amounts of positive charge and a negative charge
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nucleus
small, dense region consisting of protons and neutrons at the center of an atom
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charge
definite quanity of electricity
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electric circuit
closed, or complete path in which an electric current flows
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electric current
movement of electrically charged particles
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electric resistance
measure of how difficult it is for an electric current to flow in a materal
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generator
machine that transforms mechanical energy to electric energy
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light
electromagnetic radiation you can see
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voltage
amount of energy used to move one coulomb of electrons through the circuit
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electromagnet
temporary magnet made with a current-carrying wire coil wrapped around a magnetic core
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magnet
an object that attracts iron and other materials that have magnetic qualities similar to iron
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magnetic domain
region in a magnetic material in which the magnetic fields of the atoms all point in the same direction
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magnetic force
push or pull a magnetic field applies to either a magnetic material or an electric current
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magnetic material
material that is attracted to a magnet
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soft magnetic material
loses its magnetic field quickly (e.g. iron)
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hard magnetic material
keeps its magnetic field for long periods of time (e.g. mixtures of iron, nickel, cobalt & other elements; also naturally occurring lodestone)
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direct current
electric charges continually flow from the negative side of the source to the positive side
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alternating current
the flow of electric changes direction many times per second
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simple circuit
contains a source of electric energy (battery), an electric device (light bulb, buzzer), an electric conductor (wire), and often a switch
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series circuit
electrical path that has only one way that an electric current can flow
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parallel circuit
electrical path where each device connects to the electric source separately
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coulomb
equal to 6 quintillion electrons
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magnetic field
a region surrounding a magnetic material or a moving electric charge within which the force of magnetism acts
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magnetic poles
places on a magnet where the magnetic field lines are closest together; field lines point away from the north and toward the south ends of a magnet
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Earth's magnetic field
results from flowing molten iron and nickel in the outer core
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permanent magnets
naturally occurring magnetite or a man-made of mixture of iron, nickel and cobalt that is irreversibly magnetized
Studied by 14 people
