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42 Cards in this Set
- Front
- Back
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what does a charge do?
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exerts force
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describe charge.
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it is a physical property
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How many charges are there are what are they?
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2, positive and negative
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What does the Law of Electric Charges state?
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opposing charges attract and same charges repel
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Explain electric force.
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force between objects
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How's electric force determined?
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distance the two objects are to eachother and the size of the objects
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What does every electric force have?
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an electric field
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List the three ways to charge an object.
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Induction, conduction, and friction
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Eplain friction.
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rubbing two objects together and one object will move all it's electrons to one surface
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Explain conduction.
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when two particles touch and some electrons are sent to the other object
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Explain induction.
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when charged object moves to uncharged object and the particles rearrange
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Explain the Conservation of Particles.
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Says that particles are always there. They dont dissappear or appear.
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What do you use to detect charges?
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Electroscope
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Name 2 good conductors and how they are used.
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Metal, its used in the making of wires.
Tap water- all the ingredients in it |
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Name 5 good insulators.
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Air, plastic, rubber, glass, and wood
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Explain static electricity and give an example.
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Buildup of charges- and clothes out of the dryer clinging to each other
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Explain electric discharge and give an example.
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When static electricity moves off an object - ex: when a balloon eventually falls off a wall
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What's a lightning rod?
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a metal pole usually on tall buildings that attracts lightning.
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Name the three parts of a cell.
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Electode, Electrolyte, and wires
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What kind of energy do batteries change?
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chemical into electrical
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explain voltage
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energy per unit charge
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What does a generator do?
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It has kinetic energy to produce electricity
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Explain a photocell.
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used in solar panels. Takes light energy and produces electricity with it. ex: calculator
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Explain thermocouple.
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produces electrical energy by using heat. ex:ovens
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Definition of current.
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Rate at which charges pass at a given point
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what two things measure currents?
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galvinometer and ammeter
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AC=
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Alternating Current- outlets
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DC=
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Direct current- flashlight
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How do you detect voltage?
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voltmeter
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explain resistance.
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oposition to flow of electric charges.
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what 4 things detect resistance.
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the material, thickness, length of wire, and temperature
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whats the formula for Ohm's Law?
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amps= volts
_____ resistance |
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What electric power?and what is it measured in?
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rate at which electricity does work. measured in watts
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Whats a kilowatt?
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1000 watts.
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How are charges placed in lightning clouds?
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Positive= top
Negative= bottom |
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What moves within a cloud during a thunderstorm?
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Water and air
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Batteries-
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made of cells that convert chemical energy into electrical energy
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what do circuits consist of?
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energy source, wires, a load, and sometimes a switch
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If two objects repel eachother the charges of the objects must be...
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both positive or oth negative
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Name a device that can convert chem. energy into elec. energy
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cell
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an atom becomes charged when the atoms in the object gain or lose...
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electrons
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what type of current comes from the outlets in your home?
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Ac= Alternating Currents.
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