Question
Define potential difference. Mention its $S I$ unit and give its definition also.
✓
Answer
Amount of work done in moving a unit positive charge from one point to another point in an electric circuit carrying some current is called electric potential difference between those two points.
→ If $W$ amount of electrical work is done in moving $Q$ amount of positive charge between two points in an electric circuit carrying some current then by definition potential difference between those two points is given by :
$
V=\frac{W}{Q}
$
→ SI unit of electric potential difference
$
=\frac{\text { joule }(J)}{\operatorname{coulomb}(C)}=\text { volt }(V)
$
→ Above unit is named after Italian physicist, Alessandro Volta.
⇒ Definition of one volt :
→ When $1 J$ amount of electrical work is done in moving $1 C$ positive charge from one point to another point in an electric circuit carrying some current then electric potential difference between those two points is said to be $1 V$.
→ If $W$ amount of electrical work is done in moving $Q$ amount of positive charge between two points in an electric circuit carrying some current then by definition potential difference between those two points is given by :
$
V=\frac{W}{Q}
$
→ SI unit of electric potential difference
$
=\frac{\text { joule }(J)}{\operatorname{coulomb}(C)}=\text { volt }(V)
$
→ Above unit is named after Italian physicist, Alessandro Volta.
⇒ Definition of one volt :
→ When $1 J$ amount of electrical work is done in moving $1 C$ positive charge from one point to another point in an electric circuit carrying some current then electric potential difference between those two points is said to be $1 V$.
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