WHAT IS "ELECTRIC CURRENT"?
A STREAM OF MOVING CHARGES IS CURRENT
WHEN WILL THEY MOVE?
THEY CAN MOVE WHEN THERE IS AN APPLIED ELECTRIC FIELD
(USUALLY AT THE ENDS OF A CONDUCTING WIRE)
WHO MOVES?
IN A METAL, ELECTRONS OR –VE CHARGES
+VE CHARGES (IONS) CAN ALSO MOVE "HOLES" IN A SEMICONDUCTOR, +VE AND -VE IONS IN AN ELECTROLYTE
