Electric current is a flow of electric charge through a medium. The SI unit for measuring the rate of flow of electric charge is the ampere.

yes

Ist decreases and then increases,

It is a good conductor of electricity and does not fuse at very high temperatures or burn easily

because charge can neither be created or destroyed so we can only charge a material by removing charges from it by induction,friction,conduction.. etc,. but in this process also body can be charged only up to a limited extent as internucler attaraction limits the removing of charge also body can not be charge up to so extent that potential diirence reaches the broke down voltage.its is also found that on beta decay of nucleous we able to create new proton and electron that is both always occur in pair!