Page 6 - CHAPTER-1 (Electricity)

CHAPTER 1

ELECTRICITY

Mental floss!

The total charge acquired by a body is an integral multiple of the

magnitude of the charge on a single electron. This principle is

called quantisation of charge.

Remember this!

a. The magnitude of charge on one electron, e=-1.6×10 -19 C

b. Charge on electrons, q=ne=-n×1.6×10 -19 C

c. The magnitude of charge on one proton, e=+1.6×10 -19 C

(ii) Electric Current:

• It can be defined as the rate of flow of electric charge through

any cross-section of a conductor in unit time.

• If amount of charge flows through a conductor in time, then,

Charge (q) ne
Electric current (I)= =
Time (t) t

Since, = , where = number of electrons flowing through

the conductor.

• The SI unit of electric current is given as ampere (A), named in

honour of French scientist Andre-Marie Ampere (1775-1836).

• It is a scalar quantity.

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