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physical science uni
| Question | Answer |
|---|---|
| What is an insulator, examples | do not allow currents to flow easily, electrons tightly bound to atom - plastic, wood, rubber, sand, glass |
| what are temporary magnets | materials that become magnetized when in contact with strong magnet |
| what are magnetic poles | ends of a magnet where magnetic field is there strongest |
| what is a direct current | electrons flowing from high potential to lower potential, moves in one direction |
| what is an electric current | a flow of charge through a material |
| what is electrical currents measured in? | amps |
| what are magnetic fields? | region around magnet affected by magnet. strongest at poles goes pout north to south |
| why do magnets attract and repel | force come out of north goes to south repel by pushing away |
| _______./ .________ | switch |
| what part of the atom creates electricity and magnets | flowing electrons |
| what is electrical resistance | opposition to the flow of electricity , path of least resistance |
| thin wires have _____ resistance (than ___ wires) | thin , thick |
| can electrical charges exist alone | YES |
| an electric current through a coil of wire around a nail produces ________? | magnet |
| Longer wires have _____ resistance than short wires | more |
| The _____ paths the ______ resistance | more , less |
| ______.______ | more connections |
| --------V---------- | voltmeter measures potential / voltage |
| What causes current to flow through an electrical circuit. | voltage |
| What is the buildup of charges called? What is it? | static electricity (hair on end) an electron |
| -------A-------- | amplemeter measure e. current says intensity |
| what is a voltage source | battery or generator |
| _____ conductors have ____ resistance than insulators | high, less |
| _____ resistance, __________ current | |
| What happens when two objects reach static equilibrium? | sparks and lightning |
| What should electric circuits have? | -Source of electrical energy -devices run by electric current -connected by conducting wires + switch |
| What is a domain? | Cluster of billions of atoms w/ magnetic fields aligned |
| Objects can become ______ by _______ or ________ electrons | charged, gaining, losing (not protons - stay in nucleus) |
| How to transfer static charge | Friction - transfer from rubbing Conduction - transfer direct contact with other object Induction - force field of highly negatively charge object pushing electrons away |
| Are earths axis and magnetic north pole the same? | No! |
| When does static discharge happen | When negative electrons move towards equilibrium |
| Magnets point where? What do we call naturally occurring magnets? | 1- north star 2- lode stone |
| What is alternating current ? | As a coil moved up and down on a magnet, current reverse direction each time |
| What do moving electrons act as? | Mini electrical charges - have magnetic field associated with it |
| What measures potential energy between to points? | Volts |
| -----VMVMVMVMV------ | resistor - controls flow of electrical currents |
| What produces a magnetic field? | electric current |
| What is a electric circuit? | Complete path through which electric current can flow |
| Electrons flow form _______ to ______? | Negative to positive |
| What is a dry cell? | Electrolyte is a paste (AA batteries) |
| Do objects hold static charge forever? | No - object seek equilibrium , they want to be neutral |
| What are closely related | Magnetism + electricity |
| -------[ I ] I--------- | battery or PC power supply |
| What are inversely proportional? | Resistance (decreases) Current (Increases) |
| What is a super-conductor? | Type of material conducts electricity with 0 energy less or resistance when cooled to certain temperature. EX- aluminium |
| What do electric fields do? | exert force through force field all directions from charged particle either repel or attract |
| What prevents static charges to build up? | Humidity |
| What happens when two objects reach static equilibrium? | sparks and lightning |
| What should electric circuits have? | -Source of electrical energy -devices run by electric current -connected by conducting wires + switch |
| What is a domain? | Cluster of billions of atoms w/ magnetic fields aligned |
| Objects can become ______ by _______ or ________ electrons | charged, gaining, losing (not protons - stay in nucleus) |
| How to transfer static charge | Friction - transfer from rubbing Conduction - transfer direct contact with other object Induction - force field of highly negatively charge object pushing electrons away |
| Are earths axis and magnetic north pole the same? | No! |
| When does static discharge happen | When negative electrons move towards equilibrium |
| Magnets point where? What do we call naturally occurring magnets? | 1- north star 2- lode stone |
| What is alternating current ? | As a coil moved up and down on a magnet, current reverse direction each time |
| What do moving electrons act as? | Mini electrical charges - have magnetic field associated with it |
| What measures potential energy between to points? | Volts |
| -----VMVMVMVMV------ | resistor - controls flow of electrical currents |
| What produces a magnetic field? | electric current |
| What is a electric circuit? | Complete path through which electric current can flow |
| Electrons flow form _______ to ______? | Negative to positive |
| What is a dry cell? | Electrolyte is a paste (AA batteries) |
| Do objects hold static charge forever? | No - object seek equilibrium , they want to be neutral |
| What are closely related | Magnetism + electricity |
| -------[ I ] I--------- | battery or PC power supply |
| What are inversely proportional? | Resistance (decreases) Current (Increases) |
| What is a super-conductor? | Type of material conducts electricity with 0 energy less or resistance when cooled to certain temperature. EX- aluminium |
| What do electric fields do? | exert force through force field all directions from charged particle either repel or attract |
| What prevents static charges to build up? | Humidity |
| In electrical current _______ flows form _______ terminal to ________ terminal | Energy, positive, negative |
| EX of non - magnetic metals | - aluminum - copper - lead - brass |
| All circuits need....... | 1- power supply 2- wire 3- resisters 4-switches 5- connecters 6- meters 7- ect |
| What is a wet cell example? | electrolyte is a liquid (car battery) |
| What are objects usually? | neutral -> same number Protons and electrons |
| what are examples of magnets? | -earths iron core -used in TV's , radios, speakers -iron -nickle -cobalt -steel |
| __________________________ | wire |
| What is a conductor? Examples? | allows current to flow easily - electrons loosely bound to atoms - metals - copper, silver, iron, super conductors |
Created by:
brynnb
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