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20 Electricity(Ch20)

Electricity - Ch. 20 Prentice Hall Science Explorer

away from The electric charge arrow always points ___ positive charges.
charge Electric ____ is another names for electrons.
chemical This is the energy stored in chemical bonds holding chemical compounds together.
electric circuit a complete, unbroken path through which electric charges can flow
conduction a method of charging an object by allowing electrons to flow by direct contact from one object to another object
current Electric _____ is the continuous flow of electric charges through material that are conductors like metals.
distance The strength of the electric field is related to the _____ from the charged object.
dry cell A ____ is an electrochemical cell in which the electrolyte is a paste.
electric field is a region around a charged object where the object's electric force is exerted on other charged objects
electric force In electricity, the _____ is the attraction and repulsion between electric charges.
electrochemical Chemical reactions occur between the electrolytes and electrodes in ____ cell. These reactions cause one electrode to become negatively charged and the other electrode positively charged
electrolyte A substance that conducts electric current is called ___. Volta used silver and zinc as electrodes and salt water as his _____.
electrons When a negative charged object and a positively charged object are brought together, ___ transfer until bothobjects have the same charge.
energy Electric charges need __ to flow.
exists alone There is one important difference between electric charges and magnetic poles. Magnetic poles cannot ____ but electric charges can.
friction Charging by ____ is the transfer of electrons from one uncharged object to another by rubbing.
induction Charging by ____ is the movement of electrons from one part of an object to another part that is caused by the electric field of a second object and the objects are not touching.
insulator Material that is ____ does not transfer electricity easily or well.
Parallel A circuit in which there are two (pair) or more paths for the current to flow. Adding lights does not change the brightness.
Power The rate at which energy is transformed from one form to another is known as ______. What? Exactly.
resistance current depends on the ___ of the material it flows through and how difficult it is to flow through. The more difficult the ____, the the more difficult for the current to move through
Series A circuit in which there is a Single path for the electric current to flow. Adding bulbs make them dimmer.
static discharge The loss of static electricity as electrical charges transfer from one object to another is called _____.
static electricity In ___ the charges build up on an object but they do not flow continuously.
towards The electric charge arrow always points ____ the negative charge.
voltage ____ causes a current in an electric circuit. You can think of this word as the amount of force pushing an electric current.
voltage source A ____ is a device that creates potential difference in an electric circuit. Batteries and generators are examples.
work The movement of electrons from one atom to another is a current because ___ is a force moving an object some distance.
Conservation of Charge the law that states that charges are neither created nor destroyed but only transferred from one material to another.
conductor a material through which charges can easily flow
electrode The rod in a battery. One is often zinc and the other copper. The positive charges collect on one and the negative on the other.
terminal a convenient attachment point used to connect a cell or a battery to a circuit
battery a combination of two or more electrochemical cells in a series
wet cell an electrochemical cell in which the electrolyte is a liquid
short circuit a connection that allows current to take an unintended path
grounded allowing charges to flow directly from the circuit into Earth in event of a short circuit
third prong the round prong of a plug that connects any metal pieces in an appliance to the safety grounding wire of a building
fuse a safety device with a thin metal strip that will melt if too much current passe through a circuit. A metalloid on the periodic table.
circuit breaker a reusable safety switch that breaks the circuit when the current becomes too high