| 释义 |
Variac Electr.|ˈvɛərɪæk|
[f. variable a. + -ac, perh. repr. a.c., alternating current.]
A proprietary name for a type of autotransformer in which the ratio of the input and output voltages can be varied.
1933Official Gaz. (U.S. Patent Office) 26 Dec. 874/2 General Radio Company, Cambridge, Mass... Variac for transformers. 1938Trade Marks Jrnl. 16 Feb. 188/2 Variac... Electrical transformers (not being machines). General Radio Company.., Cambridge, State of Massachusetts. 1943Electronic Engin. XV. 516/3 The movement of the sliding contact on the Variac is effected by a small reversible motor. 1945[see interlock n. 2 b]. 1983Sci. Amer. Feb. 118/3, I plugged the immersion heater into a Variac so that I could experiment with the rate at which heat was released in the water. |