What is the flow of charge called?

Electrical current is the flow of charged particles. The electric current flows through a wire the same way as how water moves in a river. The electricity is nothing but the flow of electrons. What does the circuit diagram signify?

Electrical current is the flow of charged particles. The electric current flows through a wire the same way as how water moves in a river. The electricity is nothing but the flow of electrons. What does the graph signify?

What accounts for the flow of charge carriers in forward and reverse biasing of sillicon P-N diode-

__________ is the property to oppose the flow of charges.