When does the current flow in an electric circuit?

Why does current flow in acids?

How many time does the current flowing in an electric bulb becomes zero in one second? Explain.

What is the current flowing in the given electric circuit?

60 coulomb of charge flows through a circuit for 5 minutes. Calculate the current flowing in a circuit.

When a circuit element X is conneted across a.c. sourceof emf 220sqrt2V , a current sqrt2 A flows through it and this current is in phase with applied voltage. When another element Y is connected across same a.c. source, the same current flows in the circuit, but it leads the voltages by pi//2. Name the circuit elements X and Y.