Question

Q.3. Define the following terms and write their units if applicable.
(a) Electric current
Ans.
(b) Potential difference
Ans.
(c) Resistance
Ans.
d) Fuse wire
And. ​

Answer 1

A N S W E R :

$\underline{\mathcal{\pink{ELECTRIC\:CURRENT\::}}}$

Electric current is defined as the rate of flow of electric charge by any cross-section of a conductor in a unit time, is known as Electric current.

Units :

The unit of electric current is ampere or Coulomb/sec.

$\underline{\mathcal{\pink{POTENTIAL\:\:DIFFERENCE\::}}}$

The work done in bringing a unit positive charge from infinity to a particular point, is known as potential difference.

Units :

Joule/coulomb or volt.

$\underline{\mathcal{\pink{RESISTANCE\::}}}$

The property of a conductor due to which it opposes the flow of current through it, is called resistance.

Units :

The unit of resistance is ohm & It's represented by a Greek letter omega (Ω).

$\underline{\mathcal{\pink{FUSE-WIRE\::}}}$

An electric fuse is made of an alloy of copper, tin and lead. It's melting point is very low while a normal conducting wire do not have such specialities.