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autotransformer
(redirected from Variac)

   Also found in: Medical, Encyclopedia, Wikipedia 0.02 sec.
au·to·trans·form·er  t-trns-fôrmr)
n.
An electrical transformer in which the primary and secondary coils have some or all windings in common.

autotransformer [ˌɔːtəʊtrænsˈfɔːmə]
n
(Engineering / Electrical Engineering) a transformer in which part of the winding is common to both primary and secondary circuits


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[FIGURE 5 OMITTED] Note that you can change the wiring to place Variacs between controllers and heaters for simultaneous testing of wattage and control methods provided that the controller furnishes AC power, not DC, to the heater.
Temperature should be PID controlled--not with variac or percentage methods
Controlled by a Variac, a high voltage was gradually applied to the electrode and monitored on the digital display of the digital multimeter.
 
 
 
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