Electric current — lesson. Science State Board, Class 9.

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Electric current is a flow of electirc charges in a particular direction.

Ampere is the SI unit of Electric current, and it is denoted as '

$A$ '.

( $C$ ) is the unit of electric charge.
Ampere is a unit of electric current equal to a flow of one coulomb per second.
The coulomb is defined as the quantity of electricity transported in one second by a current of one ampere.
'One ampere' is defined as one 'coulomb' of charge moving in a conductor in one second.

$\begin{array}{l} Electric current (I) = \frac{Amount of electric charges flowing through a conductor (Q)}{Time (t)} \\ I = \frac{Q}{t} \end{array}$

Ammeter is the device used to measure the electric current.

Ammeter

For example:

When

$3$ coulombs of charge flow through a circuit for

$15$ seconds, calculate the current.

Given:

Charge

$Q = 3\ C$

Time

$t = 15\ s$

$\begin{array}{l} Electric current (I) = \frac{Amount of electric charges flowing through a conductor (Q)}{Time (t)} \\ I = \frac{Q}{t} \\ I = \frac{3}{15} \\ I = 0.2 A \end{array}$

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10. Electric current

Theory: