(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 ?

(a) What is meant by electric current ? Give its direction ? (b)Name

1.	(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 ?
Answer» Solution :(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.