(a) What is meant by electric current ? Give its direction ?
(b) Name and define its unit.
(c ) Which instrument is used to measure the electric current ? How should it be connected in a circuit ?

Explanation

(i) • Electric current is often termed as "current and it is represented by the symbol .T.. It is defined as the rate of flow of charges in a conductor
. • The electric current represents the amount of charges flowing in any cross section of a conductor in unit time.
(ii) The current flowing through a conductor is said to be one ampere, when a charge of one coulomb flows across any cross-section of a conductor, in one second. Hence,
I ampere=`(1" coulomb")/(1" second")`
(iii)  • Ammeter is used to measure the current.
• An Ammeter is connected in series with the circuit.
• The Ammeter is a low impedance device connecting it in parallel with the circuit would cause a short circuit, damaging the Ammeter or the circuit.