many cheap no name electric guitars are equiped with real bad PU's, the windings in those PU's are to loose and not glued like in descent PU's and it"s those windings that start to move and induce a current and sound even ( most off the time ) unwanted sounds.

a new descent set of PU's would cost you probably about 3 times more then what your rig costed and that is why I always say to beginners to buy a descent mid priced guitar because a cheap one only ends up as being a way to expensive piece of firewood, they are hard to play and sound like sh...t and most beginners give it up after a month because of that. A mid range guitar playes far better and sounds far better and keeps you interested in playing and in the rare case it doesn't, you can always sell it and get your money as good as completely back

Herman