What is the current in a circuit if the charge passing each point is 20 C in 40 s ?

If 20 C of charge pass a point in a circuit in 1 s, what current is flowing?

A current of 4 A flows around a circuit for 10 s. How much charge flows past a point in the circuit in this time?

Fill in the following blanks with suitable words :

(a) A current is a flow of .................For this to happen there must be a ...........circuit.

(b) Current is measured in................ using an .................. placed in ............ in a circuit.

Name a device which helps to maintain potential difference across a conductor (say, a bulb).