Circuits, Magnets and Light Test

Circuits, Magnets and Light Test Study Guide AnswersA region around a charged object where electric force is present.Electric FieldAn electromagnetic wave is special becauseIt can travel through empty space and matter.Current is expressed in Amperes (Amps)How are electromagnetic waves produced?By alternating electric and magnetic waves.How is the electromagnetic spectrum divided?By WavelengthResistance is expressed inOhmsThe major source for energy on Earth is the SunThe tiny particles that make up matter.atomsVoltage is expressed in VoltsWhat are the three basic parts of a circuit?Energy source, load and wires.What are the three properties of magnets?North/south pole, magnetic force, magnetic fieldWhat is nearsightedness?When a person can see objects up close but they look blurry far away.What is the current type and voltage used in the United States?120V Alternating CurrentWhat is the difference between alternating current and direct current? (AC vs. DC)Alternating current can go in both directions whereas direct current can only go in one direction.What is absorption?When an object absorbs light waves.What is an aurora?When Suns light particles get trapped in the magnetosphere and enter Earths atmosphere and react with Nitrogen and Oxygen.What is an electrode?Where charges enter or exit a cell.What is diffraction?The bending of light around a hole or opening.What is reflection?When something bounces off of an object at the sample angle that it entered at.What is refraction?The bending of light when light enters into a new substance.What is scattering?When a wave bounces off an object in multiple directions.What is the difference between a conductor and an insulator.A conductor allows electricity to pass through it easily like metal.An insulator does not allow an object to pass electricity easily like wood.What is the difference between a parallel and series circuit?A parallel circuit can go in numerous paths and the current is the same at all points.A series circuit can only go one path and the current is not the same at all points.What is the difference between color addition and color subtraction.Color addition is the adding of colors of light. (all colors make white light)Color subtraction is the combining of pigments. (all colors combine to make black)

What is the difference between constructive and destructive interference.Constructive interference is when two waves combine to make a wave with a greater amplitude.Destructive interference is when two waves combine to make a wave with a smaller amplitude.

What is the difference between geographic and magnetic North?Earths magnetic poles are the points on Earths surface where its magnetic forces are the strongest. Geographic North is the top most part of Earth.What is the difference between induction and conduction?Induction is the transfer of electric charges by being close to an object. (no contact)Conduction is the transfer of electric charges by direct contact. What is the electromagnetic spectrum?The entire range of electromagnetic waves.What is the formula for Power?P = E x tWhat is the speed of light?300,000,000 m/sWhen a switch is ____, charges flow freely allowing the lights to be on.ClosedWhen does scattering occur?Off of any no smooth surface or particle in the air.When resistance changes what happens to current?If resistance increases, current decreasesIf resistance decreases, current increasesWhen voltage changes what happens to current? If voltage increases, current increases.If voltage decreases, current decreases.

Where does a compass point?Magnetic NorthA object that is transparent, translucent or opaque is determined by its ability to Transmit LightWhy do we see the moon?It reflects the Suns lightWhat is the difference between conduction and convection?Convection occurs in air and conduction occurs when two objects are in contact.Where does all the energy originally come from?The SunThe EndTest is Wednesday 3/28/2012