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74 Cards in this Set

  • Front
  • Back
property that causes subatomic particles such as protons & electrons to attract or repel
electric charge
an excess or shortage of electrons produce
a net electric charge
SI unit for electric charge
coulomb (C)
like charges
opposite charges
attraction/repulsion between electrically charged objects
electric force
discovered that electric force obey a similar law to the law of universal gravitation
charles-augustin de coulomb
effect an electric charge has on other charges in the space around it
electric field
the strength of an electric field depends on
the amount of charge that produces the field and on the distance from the charge
study of the behaviors of electric charge including how charge is transferred between objects
static electricity
charges can be
transferred by friction, cantact and induction
total charge in an isolated system is constant
law of conservation of charge
rubbing a balloon
charge by friction
van de graaf generator
charge by contact
static discharge occurs when a
pathway through which charges can move forms suddenly
metals such as copper and silver are
good conductors
wood, plastic and rubber are
good insulators
opposition to the flow of charges in a metal
because less energy is available to move electrons
the current is reduced
affect a material's resistance
thickness, length and temperature
material that has almost zero resistance when cooled to low temperatures
in order for a charge to flow in a conducting wire
the wire must be connected in a complete loop that includes a source of electrical energy
difference in electrical potential energy between two places in a electric field
potential difference
also potential difference
device that converts chemical energy to electrical energy
voltage drop is maintained
across the terminal
discovered that voltage is not the same everywhere in a circuit
george ohm
voltage in a circuit equals the product of the current and the resistance
ohm's law
increasing the voltage increases
the current
keeping the same voltage and increasing the resistance
decreases the current
complete path through which charge can flow
electric circuit
circuit diagrams use symbols to
represent parts of a circuit including a source of electrical energy and devices that are run by electrical energy
charge has only one path through which it can flow
series circuit
if one element stops functioning in a series circuit
none of the elements can operate
electric circuit with two or more paths through which charges can flow
parallel circuit
if one element stops functioning in a parallel circuit
the rest of the elements still can operate
rate at which electrical energy is converted to another form
electric power
SI unit for electric power
electric power can be calculated by
multiplying voltage by current
correct wiring, fuses, circuit breakers,insulation, and grounded plugs help
make electrical energy safe to use
prevents current overload in a circuit
switch that opens when a current in a circuit is too high
circuit breaker
current finds a short path through the circuit with less resistance
short path
transfer of excess charge through a conductor
monitors current flowing to and from an outlet
ground-fault circuit interrupter
science of using electric current to process or transmit information
information sent as patterns in the controlled flow of electrons through a circuit
electronic singals
produced by altering voltage or turning on/off the current
coded signal
electronics convet information with
electrical patterns called analog and digital signals
smoothly varying signal produce by continously changing the voltage or current in a circuit
analog signal
information encoded in the strength or frequency
encodes information as a string of 1's and 0's
digital signal
vacuum tubes can change alternating current into
direct curren, increase the strength of a signal or turn a current on and off
used to control electron flow in early electronic devices
vacuum tube
3 metal tubes that emit electron beams
cathode-ray tube
crystalline solid that conducts current only under certain conditions
in n-type semiconductor, the current is
a flow of electrons
in a p-type semiconductor ir appears as though
positive charge flows
made by adding boron to silicon
p type
adding phosphorus to silicon
n type
most modern electronic devices are controlled by
solid-state components
solid-state components
diodes,transitors, and integrated circuits
solid-state component that combines a n-type and p-type seiconductor
when voltage is applied
electrons flow from n-type to p-type
because current is in one direction
a diode can change alternating current to direct
solid-state component with 3 layers of semiconductors
used a switch/amplifier
thin slice of silicon taht contains many solid-state components
integrated circuit
integrated circuit
programmable device that can store and process information
communication devices use microchips to make them
more portable, reliable and affordable
store electric charge
maintain proper voltage levels in circuits
amplify the phones incoming signals