Basic DC electricity for HVAC  :   resistors and rheostats-english    

 - Crowborough :  Audio Visual Source,       
 - Videocassette;   19cm.    
 - Bergwall Production    .
<br/><br/> VHS/NTSC    
<br/><br/><label>ISBN: </label>20040000297    
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric circuits--direct current  <br/>Electricity--measurement