science 9th grade
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| open circuit | a circuit that containsa gap which electrons cannot cross
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| electrosc | simple device that uses the laws of electrostatics to detet small electric charges
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| domain theory | the magnetic field of a magnet is the sum of thousands of smaller fields, each produced by billions of atoms containing unpaired, spinning electrons
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| law of magnetic poles | unlike poles attract, but like poles repel
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| switch | device used to anally open or close a circuit
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| transformer | device tht increases or decreases the voltage or alternating current by means of electromagnetic induction
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| speaker | device that converts pulses of electricity into sound waves
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| paramagnetic | a material that is weakly attacted to magnets and that has only one unpaired electron per atom
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| amere | the unit of elecn current
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| semi conductors | materials that are neither good conductors nor good insulators
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| dipping needle | compass that swings vertically to reveal the angle at which lines of force enter the earth
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| equator | an imaginary circle around the earth halfway between the two magnetic poles
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| genorator | device that uses electromagnetic induction to produce electric current
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| electro statics | the study of the nature, behavior, and uses of static electricity and relate phenomena
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| Van Alen Belt | the two vast, doughnut-shaped belts of high-speeds particles trapped in the earth's magnetic field
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| kilawatt hour | the unit used by electric companies to charge for electricity
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| Leyden Jar | early device used to store an electric charge
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| curcuit breaker | automatic switch that opens the circuit when current flowing through it exeeds a predetermined amount
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| magnet | object capable of attracting objects such as iron or steel
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| electric motor | device that converts electricity into motion
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| nuetral | an atom or other object that has no overall electrical charge
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| telagraph | device for communicating over long distances by means of elecroagnets
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| grounding | the pocess of diverting unwanted electrical chage drectlyinto the earth
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| condctors | materials through which current flows easlily
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| coulomb | the unit of electical charge
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| series | a circuit with loads arranged so that the electric current flows through each load one after another
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| Ohms Law | current (amerage) in a conductor is directly proportional to the voltage and inversely proportional to resisance
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| north magnetic pole | it is magnetically an s-pole
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| parrallel | a circuit with loads arranged in separte branches of the cirguit so that the current is divided among them
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| electromagne | device that produces a strong magneti field when electricity passes throug it
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| Vande Graph | device used to produce static electricity
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| watt | the SI unit of power
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| storage cell | devices that produce electric current and are designed to be recharged when the "run dry'
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| ampmeter | instrument used to measure amerage
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| electric field | the region surrounding a charged object in which other objects are attracted or repelled by an electric foce
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| resistance | the amound a certain object or material hinders electron flow
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| battery | a group of electrochemical cells connected together as a single source of current
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| law of magnetic force | the force between two magnetic poles is directly related to the product of the pole strengths and inversely related to the square of the distance between the poles
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| electron | possesses a negative charge
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| ohm | the unit used for measureing resistance
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| electric charge | always moves to the outside of the charged object
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| faramagnetic | a material t is strongly attracted to magnets and that has several unpaired electrons per atom
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| capasitator | a modern device used to store electrical charges such as in some camera flashes and other elctronic devices
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| magnetic compass | navgational device consisting of a magnet free to swing horizontally
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| lightning rod | device for protecting buildings and other structures from lightning strikes
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| closed curcuit | a circuit that contains a complete pathe for electrons to flow from the source of current through the load, and back to the source
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| volt | the unit used to measure the force with which an electric current flows
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| induction | electric charge can be imparted at a distance without direct contact between the charged object and the uncharged object
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| ball of electric charges | opposite charges attract, but like charges repel
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| loadstone | the Vikings were guided in their journeys across the North Atlantic by these unusual magnetic rocks
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| furesent lamp | an electric discharge lamp which produces light by passng and electric current through long tube filled ith mercury vapor at low pressure, causing coating on the inside of the tube glow
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| super conductors | a matrial that allows electric current to flow through it with no resistance at all
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| contact, electricity, induction | magnetization methods
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| in current electricity, the electrons "flow" from one place to anoter n static electricity, the electrons reain in one place. Tey are stationary | how does current electricity differ from static electicity?
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| the angle of declination | whatis the angle that a compass needle deviates from the true north called?
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| when an object is electricly charged, its electrons tend to "sty put" on the surgac of the charged object. Static means Stationary | why are electic charges commonly called static electricity?
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| a stream of protons and electrons tat emanates from the sun | what is solar wind?
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| direct current (DC) alternating current (AC) | what are the two types of electric current
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| source of current, cnductors, load | lis the three main components of a simple electric ciruit
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| when electricity is given the opportunity to take a "short cut" through a circuit, avoiding the load | when does a short circuit occor?
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| Both mgnetism and electricity are manifestations of the electromagnetic force/ when an electic current flows through a wire, it generates a magnetic field around the wire, forming an electromagnet. | Explain the close relationship betwen magnetism and electricity.
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| When a conductor "cuts" the lines of force in a magnetic field, it generates an electric current | how can electricity produce magnetism, and magnetism produce electricity?
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