I dont understand the explanation here. Shouldnt the X components cancel out and Y add.
http://books.google.com/books?id=pPleL5NOtb4C&pg=RA1-PA150&lpg=RA1-PA150&dq=the+diagram+below+shows+an+apparatus+assembled+by+a+physicist+using+a+120+V+battery&source=bl&ots=wv9T6OXMvw&sig=lXMyXWlZko5womtb7VPHYZ9H_MM&hl=en&sa=X&ei=4GIQUt7aOem4yAGR0YEw&ved=0CCoQ6AEwAA#v=onepage&q=the%20diagram%20below%20shows%20an%20apparatus%20assembled%20by%20a%20physicist%20using%20a%20120%20V%20battery&f=false
http://books.google.com/books?id=pPleL5NOtb4C&pg=RA1-PA150&lpg=RA1-PA150&dq=the+diagram+below+shows+an+apparatus+assembled+by+a+physicist+using+a+120+V+battery&source=bl&ots=wv9T6OXMvw&sig=lXMyXWlZko5womtb7VPHYZ9H_MM&hl=en&sa=X&ei=4GIQUt7aOem4yAGR0YEw&ved=0CCoQ6AEwAA#v=onepage&q=the%20diagram%20below%20shows%20an%20apparatus%20assembled%20by%20a%20physicist%20using%20a%20120%20V%20battery&f=false
