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As a musical instrument in western classical music.
An instrument that uses electrical conductivity to measure the concentration of salt in a solution. Source: Answers.com
Electrical energy, usually. In general, any device plugged into an electrical outlet uses electrical energy.
What instrument do we use to measure the electrical and mechanical vibrations
Rheostat is the name of an instrument used to vary electrical resistance.
electrical and electronic is the same thing your TV uses electricity
Electrical voltage can be changed by a transformer.
wind instrument
An electrical ammeter.
A voltmeter
250 BC
NAICS 334515 applies to Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals.