Conductor insulator

You need to keep in mind two basic concepts of static electricity:
(a) In contrast to current electricity that deals with high current ( in order of Amperes) and low voltage (in order of several volts to hundred volts), electrostatics deals with small charges (in order of micro-columb or nano-coulomb) but high voltage (in order of kilovolts or even megavolts).

(b) Insulators and conductors are only relative. Objects with low electrical resistance are called conductors, whereas those with high resistance are called insulators. Even a good insulator does have a high but finite resistance. There is no perfect insulator (i.e. one with infinite resistance) or perfect conductor (one with zero resistance at room temperature). Because of the finite resistance of an insulator, minute current could flow through it under a very high voltage.

Q1: charge唔係在shoes咩?shoes係insulator, 回解會去左個人身上面?

A: As said above in (a), the accumulated charges produced by rubbing cause a very high voltage to build up. Such voltage drives minute charges to go from your shoes onto your body surface because of the finite resistance of your shoes and body.

But once your hand touches the metallic door nob, there builds up a strong electric field because the door nob is a good conductor and a high voltage developed between your body and the nob. This voltage (or field) draws suddenly charges from your body to the nob and hence you would feel a shock.

Q2:transfer去insulator?

A: Similar to the above, the high voltage developed between your shoes and the conducting cores causes charges to go into the cores.

CHARGE係任何物體都會累積，但係導體上就會流動，咁你明白啦。