Electrical field: property of space around a charged object that causes forces on other charged objects. Electric field lines: lines representing the direction of electric field. Electric field strength: ratio of force exerted by field on a tiny test charge to that change. Electric generator: device converting mechanical energy into electrical energy. Electric potential: ratio of electric potential energy to charge. Electric potential difference: difference in electric potential between two points. Electric potential energy: energy of a charged body in an electrical field. Electron gas model: description of current flow through conductors. Electroscope: device to detect electric charges.
Electrostatics: study of properties and results of electric charges at rest. Equivalent resistance: single resistance that could replace several resistors. Galvanometer: device used to measure very small currents.
Ohm: SI unit of resistance; one volt per ampere. Ohms law: resistance of object is constant, independent of voltage across it. Piezoelectricity: electric potential produced by deforming material. Potential difference: difference in electric potential between two points. Potential energy: energy of object due to its position or state. Potentiometer: electrical device with variable resistance; rheostat. Power: rate of doing work; rate of energy conversion.
Resistance: ratio of potential difference across device to current through it.
Resistance force: force exerted by a machine.
Resistor: device designed to have a specific resistance.
Resultant: vector sum of two or more vectors.
Semiconductor: material in which electrical conduction is smaller than that in a conductor, but more than in insulator. Series circuit: circuit in which electrical current flows through each component, one after another. Series connection: arrangement of electrical devices so that there is only one path through which current can flow. Short circuit: low resistance connection between two points, often accidental. Watt: unit of power, one joule per second.