During an A-Level physics lesson we were shown a cross-section of a super-conductive wire that consisted of copper wire strands and several super-conductive fibres. If a super-conducting material has no resistance what-so-ever, then surely an infinite current can be passed through it (V=IR) and so what is the need for more than one super-conductive fibre?

I'm sure I've read that gravity can be used like a sort of belt that we could travel on if we could only balance ourselves against it but is there anything that could counter-weight itself so that it could shift itself around to match the equal-opposite of gravity AND is this where super-conductors are headed for?