AQA GCSE (9-1) Design and technology : electrical and mechanical systems and components 
by Bryan Williams ...  
 - London :  Hodder Education,  2017. 
 - xi, 306 p.:  ill. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>9781510401105 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical engineering--Examinations<br/>Mechanical engineering--Examinations
<br/><br/><label>Dewey Class. No.: </label>621.3076