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# Physics ch 34 EA

### EA Concept Physics T

TermDefinition
potential difference the difference in electric potential between two points. free charges flow.
electric current the flow of electric charge, measured in amperes.
ampere si unit of electric current. symbol A.
voltage source a device, such as a battery or generator, that provides a potential difference
electric resistance the resistance of a material to the flow electric current through without resistance
superconductivity a property of a material that has infinate conductivity at low temperatures. so charge flows through without resistance.
ohm the si unnit of electric resistance
ohms law the statement that the current in a circuit is directly proportional to the voltage impressed across the circuit and is inversely proportional to the resistance of the circuit
direct current electric current whose flow of charge is in one direction
alternating current electric current that repeatedly reverses direction, twice each cycle, 60 cycles per second.
diode an electronic device that restricts current to flow in a single direction in an electric circuit
electric power the rate at which electrical energy is converted into to another form such as light, heat, and mechanical energy.
this stores energy electric field
a force field that surrounds an electric charge or group of charges electric field
an electric field has both magnitude and direction
the concept of electrical potential energy per charge that has a special same electric potential
the SI unit of measurement for electrical potential volt
the name for electric potential measured in volts voltage
electrical energy can be stored in a common dive called capacitor
the energy a charge has due to its location is an electric filed electrical potential energy
this happens when there is a difference between the conductors which prevents charge flow Potential Difference
the flow of electric charge electric current
the symbol that electric current is measured in amperes
what net charge does a current-carrying a wire have zero
something that provides a potential difference voltage source
batteries and generators that supply energy that allows charges to move steadily are examples of Voltage sources
the resistance of a material to a flow of electric current to it electric resistance
what source electric resistance in measured in ohms
when the resistance if some materials becomes zero at very low temperatures superconductivity
this is the relationship among current, voltage, and resistance ohms law
what law states that current in a circuit is directly proportional to the voltage impressed across the circuit, and is inversely proportional to the resistance of the circuit ohm's law
the damaging effect when current goes through the body electric shock
this flow of charge always flows in the same direction direct current
this current repeatedly reverses direction alternating current
with this device you can operate a battery-run device on AC instead of batteries AC-DC converter
a tiny electric device that acts as a one-way valve to allow electron flow in only one direction diode
the rate at which electrical energy is converted into another form such as mechanical energy, heat, or light electric power
a complete path of which charge can flow circuit
for a continues flow of electrons, there must be a complete circuit with no ___what? gaps
the devices in a circuit form a single pathway for electron flow between the terminals the battery in series
the devices in a circuit form branches, each is of which the separate path for the flow of electrons in parallel
where devices are arranged so that charge flows through each in turn series circuit
if a device fails in this type of circuit, current in the whole circuit ceases and none of the devices will work in series
a diagram that describes an electric current schematic