Question
How is electric current expressed ? Describe about its SI unit also.
✓
Answer
Electric current is expressed as net amount of electric charge passing through the cross - section of a conductor in unit time.
- In other words, electric current is the time rate of flow of electric charge.
$\sim$ If net charge $Q$ passes through the cross-section of a given conductor in time $t$ then electric current $I$ passing through that conductor is given by,
$
I=\frac{Q}{t}
$
SI unit of electric charge is coulomb, shown by symbol $C$.
SI unit of electric current is ampere, shown by symbol $A$.
⇒ From above equation
$
1 A=1 \frac{C}{s}
$
⇒ Definition of 1 ampere :
⇒ In equation (1), if $Q=1 C$ and $t=1 s$ then $I=$ $1 \frac{C}{s}=1 A$ and so SI unit of electric current can be defined as follows.
⇒ "When net electric charge passing through cross-section of a given conductor in $1 s$ is $1 C$ then electric current passing through that conductor is said to be $1 . A$."
- In other words, electric current is the time rate of flow of electric charge.
$\sim$ If net charge $Q$ passes through the cross-section of a given conductor in time $t$ then electric current $I$ passing through that conductor is given by,
$
I=\frac{Q}{t}
$
SI unit of electric charge is coulomb, shown by symbol $C$.
SI unit of electric current is ampere, shown by symbol $A$.
⇒ From above equation
$
1 A=1 \frac{C}{s}
$
⇒ Definition of 1 ampere :
⇒ In equation (1), if $Q=1 C$ and $t=1 s$ then $I=$ $1 \frac{C}{s}=1 A$ and so SI unit of electric current can be defined as follows.
⇒ "When net electric charge passing through cross-section of a given conductor in $1 s$ is $1 C$ then electric current passing through that conductor is said to be $1 . A$."
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