Question

An electric source can supply a charge of 500 coulomb. If the current drawn by a device is 25 mA, find the time in which the electric source will be discharged completely.

Calculate the number of electrons constituting one coulomb of charge.

A current of 10 A flows through a conductor for two minutes.

The expressions that relate (i) Q, I and t and (ii) Q, V and W respectively are (Here the symbols have their usual meanings) :