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Physics ch 34 EA
EA Concept Physics T
| Term | Definition |
|---|---|
| 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 |
| these are used to prevent overloading in circuits | circuit breakers |
| diode | a tiny electronic device that acts as a one way valve to allow electron flow in only one direction |
| capacitor | acts as a storage reservoir for charge |
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