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44 Cards in this Set
- Front
- Back
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electric force
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the attraction or repulsion between electric changes
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electric field
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the region around the charged objecr where the objects force is exerted on other charged forces
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static electricity
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charges built up on an object, but they do ont flow continuously
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conservation of change
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states that charges are neither created nor destroyed
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friction
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is the transfer of electrons from one uncharged object to another by rubbing
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conduction
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is the transfer of electrons from a charged object to another object by direct contact
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induction
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is the movement of electrons to one part of an object that is caused by the electric field of a second object
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static discharge
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the loss of static electricity as electric charges transfer from one object to another
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electric current
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the continuous flow of electric charges through a material
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electric circuit
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is a complete, unbroken path through which electric charges can flow
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conductor
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a material through which charge can flow easily
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insulator
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a material which charges can not flow easily
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voltage
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the difference in electrical potential energy between two places in a circuit
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voltage
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causes a current in an electric circuit
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voltage source
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a devise that creates a potential difference in an electric circuit
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resistance
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the measure of how difficult it is for charges to flow through a material
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the greater the resistance.. the ___ current there is for a given flow
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less
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chemical energy
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energy stored in chemical compounds
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chemical reaction
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is a process in which substances change into new substancess with different properties
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electrochemical cell
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a device that converts chemical energy.
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electrolyte
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a substance that conducts electric current
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chemical reactions occer between what two things in a electrochemical cell
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1. electrolyes
2. electrodes |
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electrodes
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a metal part of an electrochemical cell, which gains or loses electrons
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terminal
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the part of an electrode above the surface of the electrolyte
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battery
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a combination of two or more electrochemical cells in a series
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wet cell
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an electrochemical cell in which the electrolyte is liquid
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dry cell
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is an electrochemical cell in which the electrylyte is a paste
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Ohm's law
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states that the resistance is eauak to the voltage divided by the current
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resistance =
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voltage divided by current
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voltage =
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current times resistance
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series circuit
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when all the parts of an electric circuit are connected one after another along one path
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parallel circuit
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when the different parts of a circuit are on seperate branches
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voltmeter
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a device used to measure voltage, or electrical potential energy difference
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power
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the rate at which energy is transformed from one form to another
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power =
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voltage x current
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the unit of power
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watt
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energy =
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power x time
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short circuit
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a connection that allows current to take the path of least resistance
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grounded
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when charges are able to flow directly from the circuit into the earth in the event of a short circuit
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third prong
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which is round, connects any metal pieces of the appliance, the electric charge will flow into the earth
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circuit breaker
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is a reusable saftey switch that breaks the circuit when the current gets too high
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fuse
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devise that contains a thin strip of metal that will melt if there is too much current through it
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how many paths can a current take in a parallel circuit
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seven
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ammeter
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a device used to measure current
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