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EA Physics Unit 9
Electric Circuits
| Term | Definition |
|---|---|
| current | The rate at which charge passes a given point in a circuit. |
| electric circuit | A closed path along which charged particles move |
| switch | A device for making, breaking or changing the connections in an electric circuit. |
| ampere | The SI unit for electric current |
| ammeter | A device used to measure current. |
| voltmeter | A device used to measure potential difference. |
| electrochemical cell | A device that converts chemical energy to electrical energy (i.e. alkaline batteries) |
| battery | A combination of two or more electrochemical cells |
| conductor | A material whose electrons move readily |
| insulator | A material whose electrons are tightly bound and few are free to move |
| resistance | The opposition that a device or conductor offers to flow of electric current |
| ohm's law | States that the resistance of a conductor is the ratio of the potential difference applied to its ends and the current that flows through it. |
| ohm | The SI unit for resistance |
| resistivity | A characteristic of a material that dictates how easily electrons flow through it. This quantity depends on the electronic structure and temperature. Resistance is directly proportional to it. |
| cross-sectional area | A surface or area exposed by making a straight cut through something at right angles to the long axis. |
| resistor | A device designed to have a definite amount of resistance. Used to adjust the flow of current. |
| variable resistor | A resistor whose effective resistance can be varied by turning a dial. |
| series circuit | A circuit in which all parts are connected end to end to provide a single path for the current. |
| equivalent resistance | The single resistance that could replace the several resistors in a circuit. |
| parallel circuit | A circuit in which the current can branch off into multiple paths, then recombine. |
| electrical power | The rate of doing work or expending energy. |
| watt | The SI unit for power |
| joule | The SI unit for energy |
| placed in series | How an ammeter must be placed in a circuit. |
| placed in parallel | How a voltmeter must be placed in a circuit. |
| circuit analysis | The process of determining V, I and R for all circuit elements. |
| potential difference | The difference in electrical potential energy per unit charge between two locations in an electric field. Batteries create this, which then causes charges to move. |
Created by:
ehansen_eak12
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