10. Elihu Thomson discovered which device?
1.Voltmeter.
2.Speedometer
3.Wattmeter
4.Thermostat
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Answer:
THERMOSTAT
Explanation:
In addition to his alternating-current motor, Thomson invented the high-frequency generator (1890), the high-frequency transformer, the three-coil generator, electric welding by the incandescent method, and the watt-hour meter.
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