# Shared Flashcard Set

## Details

Chapter 34: Electric Current Vocabulary
Electric Current Vocabulary
13
Physics
07/20/2012

Term
 potential difference
Definition
 The difference in electric potential (voltage) between two points. Free charge flows when there is a difference and will continue until both points reach a common potential.
Term
 electric current
Definition
 The flow of electric charge; measured in amperes (C/s).
Term
 ampere
Definition
 SI unit of electric current. A flow of one coulomb of charge per second is one ampere (symbol A).
Term
 voltage source
Definition
 A device, such as a battery or generator, that provides a potential difference.
Term
 electric resistance
Definition
 The resistance of a material to the flow of electric current through it; measured in ohms.
Term
 superconductivity
Definition
 A property of a material that has infinite conductivity at very low temperatures, so that charge flows through it without resistance.
Term
 ohm
Definition
 The SI unit of electric resistance. One ohm is the resistance of a device that draws a current of one ampere when a voltage of one volt is impressed across it.
Term
 Ohm's law
Definition
 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.
Term
 direct current
Definition
 Electric current whose flow of charge is always in one direction.
Term
 alternating current
Definition
 Electric current that repeatedly reverses direction, twice each cycle. Usually at 60 cycles per second, or hertz (Hz) , in North America, or 50 hertz elsewhere.
Term
 diode
Definition
 An electronic device that restricts current to flow in a single direction in an electric circuit.
Term
 electric power
Definition
 The rate at which electrical energy is converted into another form, such as light, heat or mechanical energy (or converted from another form into electrical energy).
Term
 voltage
Definition
 Potential difference; measured in volts
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