Chapter 11: Electricity

A continuous closed path made of electric components through which an electric current flows is known as an electric circuit. A simple circuit consists of the following components:

(a) Conductors

(b) Cell

(c) Switch

(d) Load

The unit of current is ampere. Ampere is defined by the flow of one coulomb of charge per second.

The value of the charge of an electron is 1.6 × 10^-19 C.

According to charge quantization,

Q = nq_e, where n is the number of electrons and q_e is the charge of an electron.

Substituting the values in the above equation, the number of electrons in a coulomb of charge can be calculated as follows:

Therefore, the number of electrons constituting one coulomb of charge is 6. 25 × 10¹⁸.