9781422276006

WORDS TO UNDERSTAND

alloy a substance made up of a mixture of metals alternating current electric current that has varying voltage amplifier device that increase the strength many times appliance an instrument or device used for a particular purpose broadcasting transmitting from a satellite or radio station ceramic a substance made of clay or bricks continuous without a break or obstruction direct current electric current that has same voltage and intensity electrochemical a branch of science which deals with chemical changes in an object when electricity is passed through it filament a thin plate-like heating element germanium name of a nonmetal goldsmith a person who makes jewelry and objects from gold hazard resulting danger or ill effects of some action indicator lamp a lamp that indicates if a particular circuit is working or not by emitting light interval a fixed time period journal a series of informative publications published after a fixed interval of time

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SCIENCE & TECHNOLOGY