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Sci. Ch 11
Sci. Ch. 11 Electricity
| Question | Answer |
|---|---|
| a property of matter that is positive or negative and can couse force between objects | electric charge |
| like charges ( ) when they are close to eachother | repel |
| ( ) force push them apart | repulsive |
| opposite charges ( ) when they are close to eachother | attract |
| an objects electric charge depends on levels of ( ) and ( ) | protons and electrons |
| more electrons than protons | negative |
| more protons than electrons | positive |
| the unit of electricl charge. is abbreviated as c | coulomb |
| charging an object can happen 2 ways: | charge by contact-transferring charged particles from one object to another by (touching) theminduced charge- pushing charged particles in an object around causing + or - reigns (without touching) |
| charges can stay in one ( ) or they can ( ) | place, move |
| are at rest and not moving | static charges |
| are charges in motion | electrical currents |
| they follow a path of least ( ) | resistance |
| an influence that tends to act on a charged object, causing a push or pull on that object | electric force |
| 2 balloons rubbed on animal fur will ( ) eachother | repel |
| the ( ) chareges on each balloon cause a ( ) force that is enough to push the balloons away | negative, repulsive |
| oppositely charged particles | force field |
| when charges move through an object that is a conductor | electrical current |
| charges flow for the same reason that ( ) energy flows | thermal |
| there must be a ( ) in the temperatures and there must be a difference in ( ) energy of charges | difference, potential |
| charges flow from high ( ) energy to low ( ) energy | potential, potential |
| current is measured in | amperes |
| with the symbol | a |
| the potential energy of a charge due to its position in an electric field | electrical potential energy |
| the change in electrical potential energy per unit charge | potential difference |
| high potential to move ( ) ( ) | far away |
| less potential to move ( ) ( ) | far away |
| these will ( ):low potentialhigh potential | attract |
| potential energy depends on | distance |
| puts charges in motion in a pathway for them to flow | coltage |
| ( ) on a battery tells us how much work is done on the ( ) in a pathway | voltage, charges |
| the amount of voltage in a battery directly affects the ( ) energy of charges | potiential |
| in an electricl current, the amount of voltage is ( ) to current ( ) by resistance | equal, multiplied |
| v= | is voltage in volts |
| I= | is current in amps |
| R= | is resistance in olms |
| the ratio of voltage to current | electricl resistance |
| resistance is cause by ( ) which slows down the motion of charges | friction |
| ( ) is whyy a TV gets warm after being on for a while | resistance |
| as moving charges ( ) some of their kinetic energy is changed into heat energy | collide |
| the unit for resistance is | ohm |
| the symbol is | a horse shoe shape |
| difference in resistance make things ( ) ( ) | conductorss and insulators |
| ( ) have low resistance | conductors |
| ( ) have high resistance | insulators |
| like flowing water, ( ) will follow a path of least ( ) | electricity, resistance |
| a definite path for charges to move | electrical circuit |
| a connected path so that charges can move | closed circuit |
| the light bulb is ( ) if the battery has voltage and the wires are ( ) | ON, conductors |
| a path that is not connected and charges connot move | open circuita |
| the light bulb is ( ) if the battery has voltage and the wires are ( ) | OFF, conductors |
| a picture representing an electrical circuit that uses standard symbols | schematic diagram |
| has only one path for charges to flow | series circuit |
| has two or more separate paths for charges to flow | parallel circuit |
| the rate (speed) at which electrical energy is used in a circuit | electrical power |
| the unit for power is the | watt |
| p | is power in watts |
| I | is current in amps |
| v | is voltage in volts |
| devices to open a circuit when too much electrical current is moving through | fuses and circuit breakers |
| contains a metal strip that melts when curent is too high | fuse |
| contains a magnet or bimetallic strip that act light a light switch to open a circuit when current is to high | circuit breaker |
| an object that produces an invisible forve field that attracts or repels another object based on the arrangement of atoms in it | magnet |
| magnets have north and south poles where the forces are ( ) | strongest |
| 2 N poles will | repel |
| 2 S poles will | repel |
| N pole will ( ) to S pole | attract |
| a region in space where a magnet force will be detected | magnetic field |
| some magnets have strong fields and others have ( ) | weak |
| electric currents produce a magnetic field | electromagnetism |
| a compass can point differently when it is near an electrical wire that when it is ( ) away | far |
| a wound-up coil of wire | solenoid |
| if we run an electrical current through a solenoid, it produces an ( ) ( ) | electric current |
| a magnet made when an iron core is inside a solenoid | electromagnet |
| the electromagnet ( ) magnets when electric current is moving through the solenoid | attracts |
| the electromagnet does not have a ( ) field when the electric current stops | magnetic |
| when an electric current is made by moving a magnet near a solenoid | electromagnetic induction |
| all electromagnetic radiation has both a wave of ( ) ( ) and wave of magnetic field | electric force |
| that is why running an electical device near a radio may produce ( ) | interference |
| ( ) radiation includes radio, microwaves,light, x-rays | electromagnetic |
| charges current flow continuously in one direction through a circuit | direct current |
| batteries provide direct current in flashlights...etc. | |
| charges more back and forth quickly | alternating current |
| outlets in walls provide alternating current |
Created by:
darrl
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