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31 Cards in this Set
- Front
- Back
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what is an analog signal |
a smoothy varying signal produced by continuously changing the voltage or current in a circuit |
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what is a digital signal |
a signal that encodes info in a string of 1's and 0's |
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are analog or digital signals more reliable |
digital |
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what is a cry |
a cathode ray tube is a type of vacuum tube in computer monitors and tvs. electrons strike a glass surface at the other end of the tube |
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what can vacuum tubes do |
can change ac to dc, increase signal strength, and turn current on or off |
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what is a diode |
a solid state component that changes ac into dc |
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what is a semiconductor |
a crystalline solid that conducts current only under certain conditions |
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what are most modern electronic devices controlled by |
solid-state components |
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what is a computer and what do communication devices use |
a programmable device that can store and process info. microchips. |
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what is an integrated circuit |
a thin slice of silicon that contains many solid-state components |
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what are electronic signals |
convey info with electrical patterns called digital and analog |
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what is a series circuit |
if one element stops, all of them do. adding bulbs increases resistance, which causes the current to decrease and dimw |
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what is a parallel circuit |
if one element stops, the rest stay aight. most houses use this |
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what do fuses do |
prevents current overload, melts if too much current passes. can only be used once cuz it melts |
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what do circuit breakers do |
a with that opens when the current is 2 high |
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what is grounding |
the transfer of excess charge through a conductor to earth |
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what is a deadly amount of current |
1000 mA |
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what is potential difference |
the difference in electrical potential energy between two places in an electric field |
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whats a battery |
a device that converts chemical energy to electrical energy |
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name some conductors |
silver gold copper salt water |
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insulators |
wood plastic ruber air wool |
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what can decrease resistance |
makin the wire thicker, cooling it, and making it shorter |
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what r two types a current |
ac and dc |
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what is an electric current |
continuous flow of electric charge |
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what a superconducterr |
a material that has ziLCH resistance when coOOL |
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what r ways of chargin |
induction, friction, contact, triboelectric effect |
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what s static discharge |
ehrn s pathway thruo which charge move forms suddENL!!!!! |
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what lAW!!! SAYS THNGS CAN BE tCHARGE sids sisss |
law of conservation of charge siss sids |
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what does the strength of an electric field depend on |
the amount of charge and distance from charge |
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if the charge is negative whih way it goi |
inward |
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if charge +++ whcihw ay it go |
outward |
