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Electricity
Question | Answer |
---|---|
electricity | the science dealing with electric charges and currents |
voltage | electromotive force or potential difference expressed in volts |
filament | the threadlike conductor in the light bulb |
ammeter | an instrument for measuring current in amperes |
conductivity | a measure of the ability of a given substance to conduct electric current |
insulator | a material of such low conductivity that the flow of current through it is negligible |
ohm | the SI unit of electrical resistance |
battery | two or more cells electrically connected to work together to produce electric energy |
transformer | an electric device consisting essentially of two or more windings wound on the same core |
rectifier | an apparatus in which current flows more readily in one direction than the other |
neutral | a system that has neither positive nor negative electric charge |
volt | the SI unit of potential difference and electromotive force |
power supply | a device that provides power to electric machines |
voltmeter | a calibrated instrument for measuring the potential difference between two points |
fuse | protective device containing a conductor that melts under heat produced by an excess current |